Graphics.DrawImage Method

Definition

Namespace:

System.Drawing

Assembly:

System.Drawing.Common.dll

Draws the specified Image at the specified location and with the original size.

Overloads

DrawImage(Image, Single, Single, RectangleF, GraphicsUnit)	Draws a portion of an image at a specified location.
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Int32, Int32, Int32, Int32)	Draws the specified Image at the specified location and with the specified size.
DrawImage(Image, Single, Single, Single, Single)	Draws the specified Image at the specified location and with the specified size.
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Point)	Draws the specified Image, using its original physical size, at the specified location.
DrawImage(Image, Point[])	Draws the specified Image at the specified location and with the specified shape and size.
DrawImage(Image, PointF)	Draws the specified Image, using its original physical size, at the specified location.
DrawImage(Image, PointF[])	Draws the specified Image at the specified location and with the specified shape and size.
DrawImage(Image, Rectangle)	Draws the specified Image at the specified location and with the specified size.
DrawImage(Image, RectangleF)	Draws the specified Image at the specified location and with the specified size.
DrawImage(Image, Int32, Int32, Rectangle, GraphicsUnit)	Draws a portion of an image at a specified location.
DrawImage(Image, Single, Single)	Draws the specified Image, using its original physical size, at the specified location.
DrawImage(Image, Point[], Rectangle, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, PointF[], RectangleF, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Rectangle, Rectangle, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, RectangleF, RectangleF, GraphicsUnit)	Draws the specified portion of the specified Image at the specified location and with the specified size.
DrawImage(Image, Int32, Int32)	Draws the specified image, using its original physical size, at the location specified by a coordinate pair.
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes)	Draws the specified portion of the specified Image at the specified location.

DrawImage(Image, Single, Single, RectangleF, GraphicsUnit)

Draws a portion of an image at a specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, float x, float y, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, float x, float y, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * single * single * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, x As Single, y As Single, srcRect As RectangleF, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

x

Single

The x-coordinate of the upper-left corner of the drawn image.

y

Single

The y-coordinate of the upper-left corner of the drawn image.

srcRect

RectangleF

RectangleF structure that specifies the portion of the Image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the coordinates at which to draw the upper-left corner of the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The size of the source rectangle determines what portion of the unscaled original image is drawn to the screen.

public:
   void DrawImage2FloatRectF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner of image.
      float x = 100.0F;
      float y = 100.0F;

      // Create rectangle for source image.
      RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y, srcRect, units );
   }

public void DrawImage2FloatRectF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner of image.
    float x = 100.0F;
    float y = 100.0F;
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, srcRect, units);
}

Public Sub DrawImage2FloatRectF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner of image.
    Dim x As Single = 100.0F
    Dim y As Single = 100.0F

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, srcRect, units)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 360 and a horizontal resolution of 72 dots per inch has a physical width of 5 inches. Similar remarks apply to pixel height and physical height.

This method draws a portion of an image using its physical size, so the image portion will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image portion has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image portion on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image portion will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit

Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)

Parameters

image

Image

Image to draw.

destPoints

Point[]

Array of three PointF structures that define a parallelogram.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) method according to application-determined criteria.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

Because this example uses an overload that does not pass a callBackData parameter, the Graphics.DrawImageAbort callback returns true, which causes the DrawImage method to end, and the exception-handling code included in the example prints out the exception text rather than drawing the image.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback1( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageParaRectAttribAbort( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback1 );

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing original image.
      Point ulCorner = Point(100,100);
      Point urCorner = Point(550,100);
      Point llCorner = Point(150,250);
      array<Point>^ destPara1 = {ulCorner,urCorner,llCorner};

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

      // Create parallelogram for drawing adjusted image.
      Point ulCorner2 = Point(325,100);
      Point urCorner2 = Point(550,100);
      Point llCorner2 = Point(375,250);
      array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw image to screen.
         e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback1(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageParaRectAttribAbort(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback1);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing original image.
    Point ulCorner = new Point(100, 100);
    Point urCorner = new Point(550, 100);
    Point llCorner = new Point(150, 250);
    Point[] destPara1 = {ulCorner, urCorner, llCorner};
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create parallelogram for drawing adjusted image.
    Point ulCorner2 = new Point(325, 100);
    Point urCorner2 = new Point(550, 100);
    Point llCorner2 = new Point(375, 250);
    Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw image to screen.
            e.Graphics.DrawImage(
                newImage,
                destPara2,
                srcRect,
                units,
                imageAttr,
                imageCallback);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback1(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageParaRectAttribAbort(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback1)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner As New Point(100, 100)
    Dim urCorner As New Point(550, 100)
    Dim llCorner As New Point(150, 250)
    Dim destPara1 As Point() = {ulCorner, urCorner, llCorner}

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New Point(325, 100)
    Dim urCorner2 As New Point(550, 100)
    Dim llCorner2 As New Point(375, 250)
    Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw image to screen.
        e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
        imageAttr, imageCallback)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

This overload with the callback parameter provides the means to stop the drawing of an image once it starts according to criteria determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit

Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)

Parameters

image

Image

Image to draw.

destPoints

PointF[]

Array of three PointF structures that define a parallelogram.

srcRect

RectangleF

RectangleF structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) method according to application-determined criteria.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

Because this example uses an overload that does not pass a callBackData parameter, the Graphics.DrawImageAbort callback returns true, which causes the DrawImage method to end, and the exception-handling code included in the example prints out the exception text rather than drawing the image.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback3( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageParaFRectAttribAbort( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback3 );

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing original image.
      PointF ulCorner1 = PointF(100.0F,100.0F);
      PointF urCorner1 = PointF(325.0F,100.0F);
      PointF llCorner1 = PointF(150.0F,250.0F);
      array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};

      // Create rectangle for source image.
      RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Create parallelogram for drawing adjusted image.
      PointF ulCorner2 = PointF(325.0F,100.0F);
      PointF urCorner2 = PointF(550.0F,100.0F);
      PointF llCorner2 = PointF(375.0F,250.0F);
      array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback3(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageParaFRectAttribAbort(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback3);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing original image.
    PointF ulCorner1 = new PointF(100.0F, 100.0F);
    PointF urCorner1 = new PointF(325.0F, 100.0F);
    PointF llCorner1 = new PointF(150.0F, 250.0F);
    PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Create parallelogram for drawing adjusted image.
    PointF ulCorner2 = new PointF(325.0F, 100.0F);
    PointF urCorner2 = new PointF(550.0F, 100.0F);
    PointF llCorner2 = new PointF(375.0F, 250.0F);
    PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destPara2,
                srcRect,
                units,
                imageAttr,
                imageCallback);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback3(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageParaFRectAttribAbort(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback3)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner1 As New PointF(100.0F, 100.0F)
    Dim urCorner1 As New PointF(325.0F, 100.0F)
    Dim llCorner1 As New PointF(150.0F, 250.0F)
    Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New PointF(325.0F, 100.0F)
    Dim urCorner2 As New PointF(550.0F, 100.0F)
    Dim llCorner2 As New PointF(375.0F, 250.0F)
    Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
        imageAttr, imageCallback)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

This overload with the callback parameter provides the means to stop the drawing of an image once it starts according to criteria determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback, int callbackData);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback, int callbackData);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * int -> unit

Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As Integer)

Parameters

image

Image

Image to draw.

destPoints

Point[]

Array of three PointF structures that define a parallelogram.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) method according to application-determined criteria.

callbackData

Int32

Value specifying additional data for the Graphics.DrawImageAbort delegate to use when checking whether to stop execution of the DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) method.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

Because this example uses an overload that passes a callBackData parameter, the Graphics.DrawImageAbort callback returns false, which causes the DrawImage method to continue, and the example draws the adjusted image to the screen.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback2( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageParaRectAttribAbortData( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback2 );
      int imageCallbackData = 1;

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing original image.
      Point ulCorner = Point(100,100);
      Point urCorner = Point(550,100);
      Point llCorner = Point(150,250);
      array<Point>^ destPara1 = {ulCorner,urCorner,llCorner};

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

      // Create parallelogram for drawing adjusted image.
      Point ulCorner2 = Point(325,100);
      Point urCorner2 = Point(550,100);
      Point llCorner2 = Point(375,250);
      array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw image to screen.
         e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback, imageCallbackData );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback2(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageParaRectAttribAbortData(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback2);
    int imageCallbackData = 1;
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing original image.
    Point ulCorner = new Point(100, 100);
    Point urCorner = new Point(550, 100);
    Point llCorner = new Point(150, 250);
    Point[] destPara1 = {ulCorner, urCorner, llCorner};
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create parallelogram for drawing adjusted image.
    Point ulCorner2 = new Point(325, 100);
    Point urCorner2 = new Point(550, 100);
    Point llCorner2 = new Point(375, 250);
    Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw image to screen.
            e.Graphics.DrawImage(
                newImage,
                destPara2,
                srcRect,
                units,
                imageAttr,
                imageCallback,
                imageCallbackData);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback2(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageParaRectAttribAbortData(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback2)
    Dim imageCallbackData As Integer = 1

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner As New Point(100, 100)
    Dim urCorner As New Point(550, 100)
    Dim llCorner As New Point(150, 250)
    Dim destPara1 As Point() = {ulCorner, urCorner, llCorner}

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New Point(325, 100)
    Dim urCorner2 As New Point(550, 100)
    Dim llCorner2 As New Point(375, 250)
    Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw image to screen.
        e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
        imageAttr, imageCallback, imageCallbackData)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

This overload with the callback and callbackData parameters provides the means to stop the drawing of an image once it starts according to criteria and data determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback, int callbackData);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback, int callbackData);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * int -> unit

Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As Integer)

Parameters

image

Image

Image to draw.

destPoints

PointF[]

Array of three PointF structures that define a parallelogram.

srcRect

RectangleF

RectangleF structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) method according to application-determined criteria.

callbackData

Int32

Value specifying additional data for the Graphics.DrawImageAbort delegate to use when checking whether to stop execution of the DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) method.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Pa Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

Because this example uses an overload that passes a callBackData parameter, the Graphics.DrawImageAbort callback returns false, which causes the DrawImage method to continue, and the example draws the adjusted image to the screen.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback4( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageParaFRectAttribAbortData( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback4 );
      int imageCallbackData = 1;

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing original image.
      PointF ulCorner1 = PointF(100.0F,100.0F);
      PointF urCorner1 = PointF(325.0F,100.0F);
      PointF llCorner1 = PointF(150.0F,250.0F);
      array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};

      // Create rectangle for source image.
      RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Create parallelogram for drawing adjusted image.
      PointF ulCorner2 = PointF(325.0F,100.0F);
      PointF urCorner2 = PointF(550.0F,100.0F);
      PointF llCorner2 = PointF(375.0F,250.0F);
      array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr, imageCallback, imageCallbackData );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback4(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageParaFRectAttribAbortData(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback4);
    int imageCallbackData = 1;
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing original image.
    PointF ulCorner1 = new PointF(100.0F, 100.0F);
    PointF urCorner1 = new PointF(325.0F, 100.0F);
    PointF llCorner1 = new PointF(150.0F, 250.0F);
    PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Create parallelogram for drawing adjusted image.
    PointF ulCorner2 = new PointF(325.0F, 100.0F);
    PointF urCorner2 = new PointF(550.0F, 100.0F);
    PointF llCorner2 = new PointF(375.0F, 250.0F);
    PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destPara2,
                srcRect,
                units,
                imageAttr,
                imageCallback,
                imageCallbackData);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback4(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageParaFRectAttribAbortData(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback4)
    Dim imageCallbackData As Integer = 1

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner1 As New PointF(100.0F, 100.0F)
    Dim urCorner1 As New PointF(325.0F, 100.0F)
    Dim llCorner1 As New PointF(150.0F, 250.0F)
    Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New PointF(325.0F, 100.0F)
    Dim urCorner2 As New PointF(550.0F, 100.0F)
    Dim llCorner2 As New PointF(375.0F, 250.0F)
    Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
        imageAttr, imageCallback, imageCallbackData)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

This overload with the callback and callbackData parameters provides the means to stop the drawing of an image once it starts according to criteria and data determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Int32

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Int32

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Int32

Width of the portion of the source image to draw.

srcHeight

Int32

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a destination rectangle in which to draw the image.

• Creates the coordinates of a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The position of the destination rectangle locates the image on the screen, and the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

void DrawImageRect4Int( PaintEventArgs^ e )
{
   // Create image.
   Image^ newImage = Image::FromFile( "SampImag.jpg" );

   // Create rectangle for displaying image.
   Rectangle destRect = Rectangle(100,100,450,150);

   // Create coordinates of rectangle for source image.
   int x = 50;
   int y = 50;
   int width = 150;
   int height = 150;
   GraphicsUnit units = GraphicsUnit::Pixel;

   // Draw image to screen.
   e->Graphics->DrawImage( newImage, destRect, x, y, width, height, units );
}

private void DrawImageRect4Int(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    Rectangle destRect = new Rectangle(100, 100, 450, 150);
             
    // Create coordinates of rectangle for source image.
    int x = 50;
    int y = 50;
    int width = 150;
    int height = 150;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, x, y, width, height, units);
}

Private Sub DrawImageRect4Int(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim destRect As New Rectangle(100, 100, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Integer = 50
    Dim y As Integer = 50
    Dim width As Integer = 150
    Dim height As Integer = 150
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, x, y, width, height, _
    units)
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Int32

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Int32

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Int32

Width of the portion of the source image to draw.

srcHeight

Int32

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a destination rectangle in which to draw the image.

• Creates the coordinates of a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the original image to the screen.

• Creates an additional rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

void DrawImageRect4IntAtrrib( PaintEventArgs^ e )
{
   // Create image.
   Image^ newImage = Image::FromFile( "SampImag.jpg" );

   // Create rectangle for displaying original image.
   Rectangle destRect1 = Rectangle(100,25,450,150);

   // Create coordinates of rectangle for source image.
   int x = 50;
   int y = 50;
   int width = 150;
   int height = 150;
   GraphicsUnit units = GraphicsUnit::Pixel;

   // Draw original image to screen.
   e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

   // Create rectangle for adjusted image.
   Rectangle destRect2 = Rectangle(100,175,450,150);

   // Create image attributes and set large gamma.
   ImageAttributes^ imageAttr = gcnew ImageAttributes;
   imageAttr->SetGamma( 4.0F );

   // Draw adjusted image to screen.
   e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr );
}

private void DrawImageRect4IntAtrrib(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    int x = 50;
    int y = 50;
    int width = 150;
    int height = 150;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, units, imageAttr);
}

Private Sub DrawImageRect4IntAtrrib(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Integer = 50
    Dim y As Integer = 50
    Dim width As Integer = 150
    Dim height As Integer = 150
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
    units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, _
    units, imageAttr)
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Single

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Single

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Single

Width of the portion of the source image to draw.

srcHeight

Single

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttrs

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a destination rectangle in which to draw the image.

• Creates the coordinates of a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the original image to the screen.

• Creates an additional rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

private:
   void DrawImageRect4FloatAttrib( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying original image.
      Rectangle destRect1 = Rectangle(100,25,450,150);

      // Create coordinates of rectangle for source image.
      float x = 50.0F;
      float y = 50.0F;
      float width = 150.0F;
      float height = 150.0F;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

      // Create rectangle for adjusted image.
      Rectangle destRect2 = Rectangle(100,175,450,150);

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );

      // Draw adjusted image to screen.
      e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr );
   }

private void DrawImageRect4FloatAttrib(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    float x = 50.0F;
    float y = 50.0F;
    float width = 150.0F;
    float height = 150.0F;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, units, imageAttr);
}

Private Sub DrawImageRect4FloatAttrib(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Single = 50.0F
    Dim y As Single = 50.0F
    Dim width As Single = 150.0F
    Dim height As Single = 150.0F
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
    height, units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destRect2, x, y, width, height, _
    units, imageAttr)
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr, System::Drawing::Graphics::DrawImageAbort ^ callback);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr, System.Drawing.Graphics.DrawImageAbort? callback);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttr As ImageAttributes, callback As Graphics.DrawImageAbort)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Int32

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Int32

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Int32

Width of the portion of the source image to draw.

srcHeight

Int32

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for image.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) method according to application-determined criteria.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination rectangle in which to draw the image.

• Creates a source rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional destination rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the size of the source rectangle and the size and shape of the destination rectangle determines the scaling of the drawn image.

Because this example uses an overload that does not pass a callBackData parameter, the Graphics.DrawImageAbort callback returns true, which causes the DrawImage method to end, and the exception-handling code included in the example prints out the exception text rather than drawing the image.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback5( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageRect4IntAtrribAbort( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback5 );

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying original image.
      Rectangle destRect1 = Rectangle(100,25,450,150);

      // Create coordinates of rectangle for source image.
      int x = 50;
      int y = 50;
      int width = 150;
      int height = 150;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

      // Create rectangle for adjusted image.
      Rectangle destRect2 = Rectangle(100,175,450,150);

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback5(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageRect4IntAtrribAbort(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback5);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    int x = 50;
    int y = 50;
    int width = 150;
    int height = 150;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destRect2,
                x, y,
                width, height,
                units,
                imageAttr,
                imageCallback);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback5(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageRect4IntAtrribAbort(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback5)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Integer = 50
    Dim y As Integer = 50
    Dim width As Integer = 150
    Dim height As Integer = 150
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
    units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
        height, units, imageAttr, imageCallback)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect object.

This overload with the callback parameter provides the means to stop the drawing of an image once it starts according to criteria determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Single

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Single

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Single

Width of the portion of the source image to draw.

srcHeight

Single

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttrs

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) method according to application-determined criteria.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination rectangle in which to draw the image.

• Creates a source rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional destination rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the size of the source rectangle and the size and shape of the destination rectangle determines the scaling of the drawn image.

Because this example uses an overload that does not pass a callBackData parameter, the Graphics.DrawImageAbort callback returns true, which causes the DrawImage method to end, and the exception-handling code included in the example prints out the exception text rather than drawing the image.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback7( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageRect4FloatAttribAbort( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback7 );

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying original image.
      Rectangle destRect1 = Rectangle(100,25,450,150);

      // Create coordinates of rectangle for source image.
      float x = 50.0F;
      float y = 50.0F;
      float width = 150.0F;
      float height = 150.0F;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

      // Create rectangle for adjusted image.
      Rectangle destRect2 = Rectangle(100,175,450,150);

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback7(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageRect4FloatAttribAbort(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback7);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    float x = 50.0F;
    float y = 50.0F;
    float width = 150.0F;
    float height = 150.0F;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destRect2,
                x, y,
                width, height,
                units,
                imageAttr,
                imageCallback);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback7(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageRect4FloatAttribAbort(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback7)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Single = 50.0F
    Dim y As Single = 50.0F
    Dim width As Single = 150.0F
    Dim height As Single = 150.0F
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
    height, units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
        height, units, imageAttr, imageCallback)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

This overload with the callback parameter provides the means to stop the drawing of an image once it starts according to criteria determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback, IntPtr callbackData);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, int srcX, int srcY, int srcWidth, int srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback, IntPtr callbackData);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * int * int * int * int * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * nativeint -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Integer, srcY As Integer, srcWidth As Integer, srcHeight As Integer, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As IntPtr)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Int32

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Int32

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Int32

Width of the portion of the source image to draw.

srcHeight

Int32

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttrs

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr) method according to application-determined criteria.

callbackData

IntPtr

nativeint

Value specifying additional data for the Graphics.DrawImageAbort delegate to use when checking whether to stop execution of the DrawImage method.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination rectangle in which to draw the image.

• Creates a source rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional destination rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the size of the source rectangle and the size and shape of the destination rectangle determines the scaling of the drawn image.

Because this example uses an overload that passes a callBackData parameter, the Graphics.DrawImageAbort callback returns false, which causes the DrawImage method to continue, and the example draws the adjusted image to the screen.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback6( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

private:
   void DrawImageRect4IntAtrribAbortData( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback6 );
      IntPtr imageCallbackData = IntPtr(1);

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying original image.
      Rectangle destRect1 = Rectangle(100,25,450,150);

      // Create coordinates of rectangle for source image.
      int x = 50;
      int y = 50;
      int width = 150;
      int height = 150;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

      // Create rectangle for adjusted image.
      Rectangle destRect2 = Rectangle(100,175,450,150);

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback, imageCallbackData );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback6(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
private void DrawImageRect4IntAtrribAbortData(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback6);
    IntPtr imageCallbackData = new IntPtr(1);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    int x = 50;
    int y = 50;
    int width = 150;
    int height = 150;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destRect2,
                x, y,
                width, height,
                units,
                imageAttr,
                imageCallback,
                imageCallbackData);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback6(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Private Sub DrawImageRect4IntAtrribAbortData(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback6)
    Dim imageCallbackData As New IntPtr(1)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Integer = 50
    Dim y As Integer = 50
    Dim width As Integer = 150
    Dim height As Integer = 150
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, _
    units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
        height, units, imageAttr, imageCallback, imageCallbackData)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

This overload with the callback and callbackData parameters provides the means to stop the drawing of an image once it starts according to criteria and data determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttrs, System::Drawing::Graphics::DrawImageAbort ^ callback, IntPtr callbackData);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttrs, System.Drawing.Graphics.DrawImageAbort? callback, IntPtr callbackData);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes * System.Drawing.Graphics.DrawImageAbort * nativeint -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit, imageAttrs As ImageAttributes, callback As Graphics.DrawImageAbort, callbackData As IntPtr)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Single

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Single

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Single

Width of the portion of the source image to draw.

srcHeight

Single

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

imageAttrs

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

callback

Graphics.DrawImageAbort

Graphics.DrawImageAbort delegate that specifies a method to call during the drawing of the image. This method is called frequently to check whether to stop execution of the DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr) method according to application-determined criteria.

callbackData

IntPtr

nativeint

Value specifying additional data for the Graphics.DrawImageAbort delegate to use when checking whether to stop execution of the DrawImage method.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code first defines a callback method for the Graphics.DrawImageAbort delegate; the definition is simplistic and merely tests to see whether the DrawImage method calls it with a null callBackData parameter. The main body of the example performs the following actions:

• Creates an instance of the Graphics.DrawImageAbort callback method.

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination rectangle in which to draw the image.

• Creates a source rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional destination rectangle in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination rectangle, the position locates the image on the screen, and the size of the source rectangle and the size and shape of the destination rectangle determines the scaling of the drawn image.

Because this example uses an overload that passes a callBackData parameter, the Graphics.DrawImageAbort callback returns false, which causes the DrawImage method to continue, and the example draws the adjusted image to the screen.

   // Define DrawImageAbort callback method.
private:
   bool DrawImageCallback8( IntPtr callBackData )
   {
      // Test for call that passes callBackData parameter.
      if ( callBackData == IntPtr::Zero )
      {
         
         // If no callBackData passed, abort DrawImage method.
         return true;
      }
      else
      {
         
         // If callBackData passed, continue DrawImage method.
         return false;
      }
   }

public:
   void DrawImageRect4FloatAttribAbortData( PaintEventArgs^ e )
   {
      // Create callback method.
      Graphics::DrawImageAbort^ imageCallback = gcnew Graphics::DrawImageAbort( this, &Form1::DrawImageCallback8 );
      IntPtr imageCallbackData = IntPtr(1);

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying original image.
      Rectangle destRect1 = Rectangle(100,25,450,150);

      // Create coordinates of rectangle for source image.
      float x = 50.0F;
      float y = 50.0F;
      float width = 150.0F;
      float height = 150.0F;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destRect1, x, y, width, height, units );

      // Create rectangle for adjusted image.
      Rectangle destRect2 = Rectangle(100,175,450,150);

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );

      // Draw adjusted image to screen.
      try
      {
         // Draw adjusted image to screen.
         e->Graphics->DrawImage( newImage, destRect2, x, y, width, height, units, imageAttr, imageCallback, imageCallbackData );
      }
      catch ( Exception^ ex ) 
      {
         e->Graphics->DrawString( ex->ToString(), gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, PointF(0,0) );
      }
   }

// Define DrawImageAbort callback method.
private bool DrawImageCallback8(IntPtr callBackData)
{
             
    // Test for call that passes callBackData parameter.
    if(callBackData==IntPtr.Zero)
    {
             
        // If no callBackData passed, abort DrawImage method.
        return true;
    }
    else
    {
             
        // If callBackData passed, continue DrawImage method.
        return false;
    }
}
public void DrawImageRect4FloatAttribAbortData(PaintEventArgs e)
{
             
    // Create callback method.
    Graphics.DrawImageAbort imageCallback
        = new Graphics.DrawImageAbort(DrawImageCallback8);
    IntPtr imageCallbackData = new IntPtr(1);
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying original image.
    Rectangle destRect1 = new Rectangle(100, 25, 450, 150);
             
    // Create coordinates of rectangle for source image.
    float x = 50.0F;
    float y = 50.0F;
    float width = 150.0F;
    float height = 150.0F;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, height, units);
             
    // Create rectangle for adjusted image.
    Rectangle destRect2 = new Rectangle(100, 175, 450, 150);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    try
    {
        checked
        {
             
            // Draw adjusted image to screen.
            e.Graphics.DrawImage(
                newImage,
                destRect2,
                x, y,
                width, height,
                units,
                imageAttr,
                imageCallback,
                imageCallbackData);
        }
    }
    catch (Exception ex)
    {
        e.Graphics.DrawString(
            ex.ToString(),
            new Font("Arial", 8),
            Brushes.Black,
            new PointF(0, 0));
    }
}

Private Function DrawImageCallback8(ByVal callBackData As IntPtr) As Boolean

    ' Test for call that passes callBackData parameter.
    If callBackData.Equals(IntPtr.Zero) Then

        ' If no callBackData passed, abort DrawImage method.
        Return True
    Else

        ' If callBackData passed, continue DrawImage method.
        Return False
    End If
End Function
Public Sub DrawImageRect4FloatAttribAbortData(ByVal e As PaintEventArgs)

    ' Create callback method.
    Dim imageCallback As New _
    Graphics.DrawImageAbort(AddressOf DrawImageCallback8)
    Dim imageCallbackData As New IntPtr(1)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying original image.
    Dim destRect1 As New Rectangle(100, 25, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Single = 50.0F
    Dim y As Single = 50.0F
    Dim width As Single = 150.0F
    Dim height As Single = 150.0F
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destRect1, x, y, width, _
    height, units)

    ' Create rectangle for adjusted image.
    Dim destRect2 As New Rectangle(100, 175, 450, 150)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    Try

        ' Draw adjusted image to screen.
        e.Graphics.DrawImage(newImage, destRect2, x, y, width, _
        height, units, imageAttr, imageCallback, imageCallbackData)
    Catch ex As Exception
        e.Graphics.DrawString(ex.ToString(), New Font("Arial", 8), _
        Brushes.Black, New PointF(0, 0))
    End Try
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

This overload with the callback and callbackData parameters provides the means to stop the drawing of an image once it starts according to criteria and data determined by the application. For example, an application could start drawing a large image and the user might scroll the image off the screen, in which case the application could stop the drawing.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, float srcX, float srcY, float srcWidth, float srcHeight, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * single * single * single * single * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcX As Single, srcY As Single, srcWidth As Single, srcHeight As Single, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcX

Single

The x-coordinate of the upper-left corner of the portion of the source image to draw.

srcY

Single

The y-coordinate of the upper-left corner of the portion of the source image to draw.

srcWidth

Single

Width of the portion of the source image to draw.

srcHeight

Single

Height of the portion of the source image to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used to determine the source rectangle.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the coordinates of a destination rectangle in which to draw the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The position of the destination rectangle locates the image on the screen, the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

private:
   void DrawImageRect4Float( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying image.
      Rectangle destRect = Rectangle(100,100,450,150);

      // Create coordinates of rectangle for source image.
      float x = 50.0F;
      float y = 50.0F;
      float width = 150.0F;
      float height = 150.0F;
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destRect, x, y, width, height, units );
   }

private void DrawImageRect4Float(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    Rectangle destRect = new Rectangle(100, 100, 450, 150);
             
    // Create coordinates of rectangle for source image.
    float x = 50.0F;
    float y = 50.0F;
    float width = 150.0F;
    float height = 150.0F;
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, x, y, width, height, units);
}

Private Sub DrawImageRect4Float(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim destRect As New Rectangle(100, 100, 450, 150)

    ' Create coordinates of rectangle for source image.
    Dim x As Single = 50.0F
    Dim y As Single = 50.0F
    Dim width As Single = 150.0F
    Dim height As Single = 150.0F
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, x, y, width, height, _
    units)
End Sub

Remarks

The srcX, srcY, srcWidth, and srcHeight parameters specify a rectangular portion, of the image object to draw. The rectangle is relative to the upper-left corner of the source image. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Int32, Int32, Int32, Int32)

Draws the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, int x, int y, int width, int height);

public void DrawImage (System.Drawing.Image image, int x, int y, int width, int height);

member this.DrawImage : System.Drawing.Image * int * int * int * int -> unit

Public Sub DrawImage (image As Image, x As Integer, y As Integer, width As Integer, height As Integer)

Parameters

image

Image

Image to draw.

x

Int32

The x-coordinate of the upper-left corner of the drawn image.

y

Int32

The y-coordinate of the upper-left corner of the drawn image.

width

Int32

Width of the drawn image.

height

Int32

Height of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the position and size of a rectangle in which to draw the image.

• Draws the image to the screen.

The position of the rectangle locates the image on the screen, and the size of the original image and the size of the rectangle determines the scaling of the drawn image.

public:
   void DrawImage4Int( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner.
      // of image and for size of image.
      int x = 100;
      int y = 100;
      int width = 450;
      int height = 150;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y, width, height );
   }

public void DrawImage4Int(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner.
             
    // of image and for size of image.
    int x = 100;
    int y = 100;
    int width = 450;
    int height = 150;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, width, height);
}

Public Sub DrawImage4Int(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner

    ' of image and for size of image.
    Dim x As Integer = 100
    Dim y As Integer = 100
    Dim width As Integer = 450
    Dim height As Integer = 150

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, width, height)
End Sub

Remarks

The rectangle defined by the x, y, width, and height parameters determines the position and size of the drawn image.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Single, Single, Single, Single)

Draws the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, float x, float y, float width, float height);

public void DrawImage (System.Drawing.Image image, float x, float y, float width, float height);

member this.DrawImage : System.Drawing.Image * single * single * single * single -> unit

Public Sub DrawImage (image As Image, x As Single, y As Single, width As Single, height As Single)

Parameters

image

Image

Image to draw.

x

Single

The x-coordinate of the upper-left corner of the drawn image.

y

Single

The y-coordinate of the upper-left corner of the drawn image.

width

Single

Width of the drawn image.

height

Single

Height of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the position and size of a rectangle in which to draw the image.

• Draws the image to the screen.

The position of the rectangle locates the image on the screen, and the size of the original image and the size of the rectangle determines the scaling of the drawn image.

public:
   void DrawImage4Float( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner.
      // of image and for size of image.
      float x = 100.0F;
      float y = 100.0F;
      float width = 450.0F;
      float height = 150.0F;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y, width, height );
   }

public void DrawImage4Float(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner.
             
    // of image and for size of image.
    float x = 100.0F;
    float y = 100.0F;
    float width = 450.0F;
    float height = 150.0F;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, width, height);
}

Public Sub DrawImage4Float(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner

    ' of image and for size of image.
    Dim x As Single = 100.0F
    Dim y As Single = 100.0F
    Dim width As Single = 450.0F
    Dim height As Single = 150.0F

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, width, height)
End Sub

Remarks

The rectangle defined by the x, y, width, and height parameters determines the position and size of the drawn image.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit

Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)

Parameters

image

Image

Image to draw.

destPoints

PointF[]

Array of three PointF structures that define a parallelogram.

srcRect

RectangleF

RectangleF structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination parallelogram in which to draw the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted destination parallelogram, the position locates the image on the screen, the size of the source rectangle and the size and shape of the destination parallelogram determines the scaling and shearing of the drawn image, and the size of the rectangle determines what portion of the original image is drawn to the screen.

void DrawImageParaFRectFAttrib( PaintEventArgs^ e )
{
   // Create image.
   Image^ newImage = Image::FromFile( "SampImag.jpg" );

   // Create parallelogram for drawing original image.
   PointF ulCorner1 = PointF(100.0F,100.0F);
   PointF urCorner1 = PointF(325.0F,100.0F);
   PointF llCorner1 = PointF(150.0F,250.0F);
   array<PointF>^ destPara1 = {ulCorner1,urCorner1,llCorner1};

   // Create rectangle for source image.
   RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
   GraphicsUnit units = GraphicsUnit::Pixel;

   // Create parallelogram for drawing adjusted image.
   PointF ulCorner2 = PointF(325.0F,100.0F);
   PointF urCorner2 = PointF(550.0F,100.0F);
   PointF llCorner2 = PointF(375.0F,250.0F);
   array<PointF>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

   // Draw original image to screen.
   e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

   // Create image attributes and set large gamma.
   ImageAttributes^ imageAttr = gcnew ImageAttributes;
   imageAttr->SetGamma( 4.0F );

   // Draw adjusted image to screen.
   e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr );
}

private void DrawImageParaFRectFAttrib(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing original image.
    PointF ulCorner1 = new PointF(100.0F, 100.0F);
    PointF urCorner1 = new PointF(325.0F, 100.0F);
    PointF llCorner1 = new PointF(150.0F, 250.0F);
    PointF[] destPara1 = {ulCorner1, urCorner1, llCorner1};
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Create parallelogram for drawing adjusted image.
    PointF ulCorner2 = new PointF(325.0F, 100.0F);
    PointF urCorner2 = new PointF(550.0F, 100.0F);
    PointF llCorner2 = new PointF(375.0F, 250.0F);
    PointF[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, imageAttr);
}

Private Sub DrawImageParaFRectFAttrib(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing original image.
    Dim ulCorner1 As New PointF(100.0F, 100.0F)
    Dim urCorner1 As New PointF(325.0F, 100.0F)
    Dim llCorner1 As New PointF(150.0F, 250.0F)
    Dim destPara1 As PointF() = {ulCorner1, urCorner1, llCorner1}

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New PointF(325.0F, 100.0F)
    Dim urCorner2 As New PointF(550.0F, 100.0F)
    Dim llCorner2 As New PointF(375.0F, 250.0F)
    Dim destPara2 As PointF() = {ulCorner2, urCorner2, llCorner2}

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
    imageAttr)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point)

Draws the specified Image, using its original physical size, at the specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Point point);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point point);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point -> unit

Public Sub DrawImage (image As Image, point As Point)

Parameters

image

Image

Image to draw.

point

Point

Point structure that represents the location of the upper-left corner of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a point at which to draw the upper-left corner of the image.

• Draws the unscaled image to the screen.

private:
   void DrawImagePoint( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create Point for upper-left corner of image.
      Point ulCorner = Point(100,100);

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, ulCorner );
   }

private void DrawImagePoint(PaintEventArgs e)
{         
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create Point for upper-left corner of image.
    Point ulCorner = new Point(100, 100);
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, ulCorner);
}

Private Sub DrawImagePoint(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create Point for upper-left corner of image.
    Dim ulCorner As New Point(100, 100)

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, ulCorner)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 216 and a horizontal resolution of 72 dots per inch has a physical width of 3 inches. Similar remarks apply to pixel height and physical height.

This method draws an image using its physical size, so the image will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point[])

Draws the specified Image at the specified location and with the specified shape and size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] -> unit

Public Sub DrawImage (image As Image, destPoints As Point())

Parameters

image

Image

Image to draw.

destPoints

Point[]

Array of three Point structures that define a parallelogram.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Draws the image to the screen.

The position of the parallelogram locates the image on the screen, and the size of the original image and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

private:
   void DrawImagePara( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing image.
      Point ulCorner = Point(100,100);
      Point urCorner = Point(550,100);
      Point llCorner = Point(150,250);
      array<Point>^ destPara = {ulCorner,urCorner,llCorner};

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destPara );
   }

private void DrawImagePara(PaintEventArgs e)
{
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    Point ulCorner = new Point(100, 100);
    Point urCorner = new Point(550, 100);
    Point llCorner = new Point(150, 250);
    Point[] destPara = {ulCorner, urCorner, llCorner};
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara);
}

Private Sub DrawImagePara(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing image.
    Dim ulCorner As New Point(100, 100)
    Dim urCorner As New Point(550, 100)
    Dim llCorner As New Point(150, 250)
    Dim destPara As Point() = {ulCorner, urCorner, llCorner}

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three Point structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The image represented by the image parameter is scaled and sheared to fit the shape of the parallelogram specified by the destPoints parameters.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF)

Draws the specified Image, using its original physical size, at the specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::PointF point);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF point);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF -> unit

Public Sub DrawImage (image As Image, point As PointF)

Parameters

image

Image

Image to draw.

point

PointF

PointF structure that represents the upper-left corner of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a point at which to draw the upper-left corner of the image.

• Draws the unscaled image to the screen.

private:
   void DrawImagePointF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create point for upper-left corner of image.
      PointF ulCorner = PointF(100.0F,100.0F);

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, ulCorner );
   }

private void DrawImagePointF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create point for upper-left corner of image.
    PointF ulCorner = new PointF(100.0F, 100.0F);
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, ulCorner);
}

Private Sub DrawImagePointF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create point for upper-left corner of image.
    Dim ulCorner As New PointF(100.0F, 100.0F)

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, ulCorner)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 216 and a horizontal resolution of 72 dots per inch has a physical width of 3 inches. Similar remarks apply to pixel height and physical height.

This method draws an image using its physical size, so the image will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF[])

Draws the specified Image at the specified location and with the specified shape and size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] -> unit

Public Sub DrawImage (image As Image, destPoints As PointF())

Parameters

image

Image

Image to draw.

destPoints

PointF[]

Array of three PointF structures that define a parallelogram.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Draws the image to the screen.

The position of the parallelogram locates the image on the screen, and the size of the original image and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

private:
   void DrawImageParaF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing image.
      PointF ulCorner = PointF(100.0F,100.0F);
      PointF urCorner = PointF(550.0F,100.0F);
      PointF llCorner = PointF(150.0F,250.0F);
      array<PointF>^ destPara = {ulCorner,urCorner,llCorner};

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destPara );
   }

private void DrawImageParaF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    PointF ulCorner = new PointF(100.0F, 100.0F);
    PointF urCorner = new PointF(550.0F, 100.0F);
    PointF llCorner = new PointF(150.0F, 250.0F);
    PointF[] destPara = {ulCorner, urCorner, llCorner};
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara);
}

Private Sub DrawImageParaF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing image.
    Dim ulCorner As New PointF(100.0F, 100.0F)
    Dim urCorner As New PointF(550.0F, 100.0F)
    Dim llCorner As New PointF(150.0F, 250.0F)
    Dim destPara As PointF() = {ulCorner, urCorner, llCorner}

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The image represented by the image object is scaled and sheared to fit the shape of the parallelogram specified by the destPoints parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle)

Draws the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle rect);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle rect);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle -> unit

Public Sub DrawImage (image As Image, rect As Rectangle)

Parameters

image

Image

Image to draw.

rect

Rectangle

Rectangle structure that specifies the location and size of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a rectangle in which to draw the image.

• Draws the image to the screen.

The position of the rectangle locates the image on the screen, and the size of the original image and the size of the rectangle determines the scaling of the drawn image.

private:
   void DrawImageRect( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying image.
      Rectangle destRect = Rectangle(100,100,450,150);

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destRect );
   }

private void DrawImageRect(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    Rectangle destRect = new Rectangle(100, 100, 450, 150);
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect);
}

Private Sub DrawImageRect(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim destRect As New Rectangle(100, 100, 450, 150)

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect)
End Sub

Remarks

The image represented by the image object is scaled to the dimensions of the rect rectangle.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, RectangleF)

Draws the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::RectangleF rect);

public void DrawImage (System.Drawing.Image image, System.Drawing.RectangleF rect);

member this.DrawImage : System.Drawing.Image * System.Drawing.RectangleF -> unit

Public Sub DrawImage (image As Image, rect As RectangleF)

Parameters

image

Image

Image to draw.

rect

RectangleF

RectangleF structure that specifies the location and size of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a rectangle in which to draw the image.

• Draws the image to the screen.

The position of the rectangle locates the image on the screen, and the original size of the image and the size of the rectangle determines the scaling of the drawn image.

public:
   void DrawImageRectF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying image.
      RectangleF rect = RectangleF(100.0F,100.0F,450.0F,150.0F);

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, rect );
   }

public void DrawImageRectF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    RectangleF rect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, rect);
}

Public Sub DrawImageRectF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim rect As New RectangleF(100.0F, 100.0F, 450.0F, 150.0F)

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, rect)
End Sub

Remarks

The image represented by the image object is scaled to the dimensions of the rect rectangle.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Int32, Int32, Rectangle, GraphicsUnit)

Draws a portion of an image at a specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, int x, int y, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, int x, int y, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * int * int * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, x As Integer, y As Integer, srcRect As Rectangle, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

x

Int32

The x-coordinate of the upper-left corner of the drawn image.

y

Int32

The y-coordinate of the upper-left corner of the drawn image.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the coordinates at which to draw the upper-left corner of the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The size of the source rectangle determines what portion of the unscaled original image is drawn to the screen.

public:
   void DrawImage2IntRect( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner of image.
      int x = 100;
      int y = 100;

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y, srcRect, units );
   }

public void DrawImage2IntRect(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner of image.
    int x = 100;
    int y = 100;
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, srcRect, units);
}

Public Sub DrawImage2IntRect(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner of image.
    Dim x As Integer = 100
    Dim y As Integer = 100

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y, srcRect, units)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 360 and a horizontal resolution of 72 dots per inch has a physical width of 5 inches. Similar remarks apply to pixel height and physical height.

This method draws a portion of an image using its physical size, so the image portion will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image portion has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image portion on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image portion will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Single, Single)

Draws the specified Image, using its original physical size, at the specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, float x, float y);

public void DrawImage (System.Drawing.Image image, float x, float y);

member this.DrawImage : System.Drawing.Image * single * single -> unit

Public Sub DrawImage (image As Image, x As Single, y As Single)

Parameters

image

Image

Image to draw.

x

Single

The x-coordinate of the upper-left corner of the drawn image.

y

Single

The y-coordinate of the upper-left corner of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates the coordinates of a point at which to draw the upper-left corner of the image.

• Draws the unscaled image to the screen.

public:
   void DrawImage2Float( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner of image.
      float x = 100.0F;
      float y = 100.0F;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y );
   }

public void DrawImage2Float(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create coordinates for upper-left corner of image.
    float x = 100.0F;
    float y = 100.0F;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y);
}

Public Sub DrawImage2Float(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner of image.
    Dim x As Single = 100.0F
    Dim y As Single = 100.0F

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 216 and a horizontal resolution of 72 dots per inch has a physical width of 3 inches. Similar remarks apply to pixel height and physical height.

This method draws an image using its physical size, so the image will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call this method to draw that image on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point[], Rectangle, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destPoints

Point[]

Array of three Point structures that define a parallelogram.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the image to the screen.

The position of the parallelogram locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

private:
   void DrawImageParaRect( PaintEventArgs^ e )
   {

      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing image.
      Point ulCorner = Point(100,100);
      Point urCorner = Point(325,100);
      Point llCorner = Point(150,250);
      array<Point>^ destPara = {ulCorner,urCorner,llCorner};

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destPara, srcRect, units );
   }

private void DrawImageParaRect(PaintEventArgs e)
{
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    Point ulCorner = new Point(100, 100);
    Point urCorner = new Point(325, 100);
    Point llCorner = new Point(150, 250);
    Point[] destPara = {ulCorner, urCorner, llCorner};
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara, srcRect, units);
}

Private Sub DrawImageParaRect(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing image.
    Dim ulCorner As New Point(100, 100)
    Dim urCorner As New Point(325, 100)
    Dim llCorner As New Point(150, 250)
    Dim destPara As Point() = {ulCorner, urCorner, llCorner}

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara, srcRect, units)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three Point structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, PointF[], RectangleF, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::PointF> ^ destPoints, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.PointF[] destPoints, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.PointF[] * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destPoints As PointF(), srcRect As RectangleF, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destPoints

PointF[]

Array of three PointF structures that define a parallelogram.

srcRect

RectangleF

RectangleF structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a destination parallelogram in which to draw the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The position of the destination parallelogram locates the image on the screen, the size of the source rectangle and the size and shape of the destination parallelogram determines the scaling and shearing of the drawn image, and the size of the rectangle determines what portion of the original image is drawn to the screen.

private:
   void DrawImageParaFRectF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing image.
      PointF ulCorner = PointF(100.0F,100.0F);
      PointF urCorner = PointF(550.0F,100.0F);
      PointF llCorner = PointF(150.0F,250.0F);
      array<PointF>^ destPara = {ulCorner,urCorner,llCorner};

      // Create rectangle for source image.
      RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destPara, srcRect, units );
   }

private void DrawImageParaFRectF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    PointF ulCorner = new PointF(100.0F, 100.0F);
    PointF urCorner = new PointF(550.0F, 100.0F);
    PointF llCorner = new PointF(150.0F, 250.0F);
    PointF[] destPara = {ulCorner, urCorner, llCorner};
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara, srcRect, units);
}

Private Sub DrawImageParaFRectF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing image.
    Dim ulCorner As New PointF(100.0F, 100.0F)
    Dim urCorner As New PointF(550.0F, 100.0F)
    Dim llCorner As New PointF(150.0F, 250.0F)
    Dim destPara As PointF() = {ulCorner, urCorner, llCorner}

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destPara, srcRect, units)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three PointF structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Rectangle, Rectangle, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Rectangle destRect, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.Rectangle destRect, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.Rectangle * System.Drawing.Rectangle * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destRect As Rectangle, srcRect As Rectangle, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destRect

Rectangle

Rectangle structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a destination rectangle in which to draw the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The position of the destination rectangle locates the image on the screen, the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

private:
   void DrawImageRectRect( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying image.
      Rectangle destRect = Rectangle(100,100,450,150);

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destRect, srcRect, units );
   }

private void DrawImageRectRect(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    Rectangle destRect = new Rectangle(100, 100, 450, 150);
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, srcRect, units);
}

Private Sub DrawImageRectRect(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim destRect As New Rectangle(100, 100, 450, 150)

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, srcRect, units)
End Sub

Remarks

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, RectangleF, RectangleF, GraphicsUnit)

Draws the specified portion of the specified Image at the specified location and with the specified size.

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::RectangleF destRect, System::Drawing::RectangleF srcRect, System::Drawing::GraphicsUnit srcUnit);

public void DrawImage (System.Drawing.Image image, System.Drawing.RectangleF destRect, System.Drawing.RectangleF srcRect, System.Drawing.GraphicsUnit srcUnit);

member this.DrawImage : System.Drawing.Image * System.Drawing.RectangleF * System.Drawing.RectangleF * System.Drawing.GraphicsUnit -> unit

Public Sub DrawImage (image As Image, destRect As RectangleF, srcRect As RectangleF, srcUnit As GraphicsUnit)

Parameters

image

Image

Image to draw.

destRect

RectangleF

RectangleF structure that specifies the location and size of the drawn image. The image is scaled to fit the rectangle.

srcRect

RectangleF

RectangleF structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates a destination rectangle in which to draw the image.

• Creates a source rectangle from which to extract a portion of the image.

• Sets the unit of measure of the source rectangle to pixels.

• Draws the image to the screen.

The position of the destination rectangle locates the image on the screen, the sizes of the source and destination rectangles determine the scaling of the drawn image, and the size of the source rectangle determines what portion of the original image is drawn to the screen.

public:
   void DrawImageRectFRectF( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create rectangle for displaying image.
      RectangleF destRect = RectangleF(100.0F,100.0F,450.0F,150.0F);

      // Create rectangle for source image.
      RectangleF srcRect = RectangleF(50.0F,50.0F,150.0F,150.0F);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, destRect, srcRect, units );
   }

public void DrawImageRectFRectF(PaintEventArgs e)
{
             
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create rectangle for displaying image.
    RectangleF destRect = new RectangleF(100.0F, 100.0F, 450.0F, 150.0F);
             
    // Create rectangle for source image.
    RectangleF srcRect = new RectangleF(50.0F, 50.0F, 150.0F, 150.0F);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, srcRect, units);
}

Public Sub DrawImageRectFRectF(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create rectangle for displaying image.
    Dim destRect As New RectangleF(100.0F, 100.0F, 450.0F, 150.0F)

    ' Create rectangle for source image.
    Dim srcRect As New RectangleF(50.0F, 50.0F, 150.0F, 150.0F)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, destRect, srcRect, units)
End Sub

Remarks

The srcRect parameter specifies a rectangular portion of the image object to draw. This portion is scaled to fit inside the rectangle specified by the destRect parameter.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Int32, Int32)

Draws the specified image, using its original physical size, at the location specified by a coordinate pair.

public:
 void DrawImage(System::Drawing::Image ^ image, int x, int y);

public void DrawImage (System.Drawing.Image image, int x, int y);

member this.DrawImage : System.Drawing.Image * int * int -> unit

Public Sub DrawImage (image As Image, x As Integer, y As Integer)

Parameters

image

Image

Image to draw.

x

Int32

The x-coordinate of the upper-left corner of the drawn image.

y

Int32

The y-coordinate of the upper-left corner of the drawn image.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example SampImag.jpg in the folder of the example.

• Creates the coordinates of a point at which to draw the upper-left corner of the image.

• Draws the unscaled image.

public:
   void DrawImage2Int( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create coordinates for upper-left corner of image.
      int x = 100;
      int y = 100;

      // Draw image to screen.
      e->Graphics->DrawImage( newImage, x, y );
   }

public void DrawImage2Int(PaintEventArgs e)
{
                
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
                
    // Create coordinates for upper-left corner of image.
    int x = 100;
    int y = 100;
                
    // Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y);
}

Public Sub DrawImage2Int(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create coordinates for upper-left corner of image.
    Dim x As Integer = 100
    Dim y As Integer = 100

    ' Draw image to screen.
    e.Graphics.DrawImage(newImage, x, y)
End Sub

Remarks

An Image stores a value for pixel width and a value for horizontal resolution (dots per inch). The physical width, measured in inches, of an image is the pixel width divided by the horizontal resolution. For example, an image with a pixel width of 216 and a horizontal resolution of 72 dots per inch has a physical width of 3 inches. Similar remarks apply to pixel height and physical height.

The DrawImage method draws an image using its physical size, so the image will have its correct size in inches regardless of the resolution (dots per inch) of the display device. For example, suppose an image has a pixel width of 216 and a horizontal resolution of 72 dots per inch. If you call DrawImage to draw that image on a device that has a resolution of 96 dots per inch, the pixel width of the rendered image will be (216/72)*96 = 288.

See also

• Images, Bitmaps, and Metafiles

DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes)

Draws the specified portion of the specified Image at the specified location.

public:
 void DrawImage(System::Drawing::Image ^ image, cli::array <System::Drawing::Point> ^ destPoints, System::Drawing::Rectangle srcRect, System::Drawing::GraphicsUnit srcUnit, System::Drawing::Imaging::ImageAttributes ^ imageAttr);

public void DrawImage (System.Drawing.Image image, System.Drawing.Point[] destPoints, System.Drawing.Rectangle srcRect, System.Drawing.GraphicsUnit srcUnit, System.Drawing.Imaging.ImageAttributes? imageAttr);

member this.DrawImage : System.Drawing.Image * System.Drawing.Point[] * System.Drawing.Rectangle * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit

Public Sub DrawImage (image As Image, destPoints As Point(), srcRect As Rectangle, srcUnit As GraphicsUnit, imageAttr As ImageAttributes)

Parameters

image

Image

Image to draw.

destPoints

Point[]

Array of three Point structures that define a parallelogram.

srcRect

Rectangle

Rectangle structure that specifies the portion of the image object to draw.

srcUnit

GraphicsUnit

Member of the GraphicsUnit enumeration that specifies the units of measure used by the srcRect parameter.

imageAttr

ImageAttributes

ImageAttributes that specifies recoloring and gamma information for the image object.

Exceptions

ArgumentNullException

image is null.

Examples

The following code example is designed for use with Windows Forms, and it requires PaintEventArgs e, which is a parameter of the Paint event handler. The code performs the following actions:

• Creates an image from a JPEG file SampImag.jpg in the folder of the example.

• Creates points that define a parallelogram in which to draw the image.

• Creates a rectangle to select the portion of the image to draw.

• Sets the graphics drawing unit to pixel.

• Draws the original image to the screen.

• Creates an additional parallelogram in which to draw an adjusted image.

• Creates and sets the attributes of the adjusted image to have a larger-than-usual gamma value.

• Draws the adjusted image to the screen.

For the original, unadjusted parallelogram, the position locates the image on the screen, and the size of the rectangle and the size and shape of the parallelogram determines the scaling and shearing of the drawn image.

private:
   void DrawImageParaRectAttrib( PaintEventArgs^ e )
   {
      // Create image.
      Image^ newImage = Image::FromFile( "SampImag.jpg" );

      // Create parallelogram for drawing image.
      Point ulCorner1 = Point(100,100);
      Point urCorner1 = Point(325,100);
      Point llCorner1 = Point(150,250);
      array<Point>^ destPara1 = {ulCorner1,urCorner1,llCorner1};

      // Create rectangle for source image.
      Rectangle srcRect = Rectangle(50,50,150,150);
      GraphicsUnit units = GraphicsUnit::Pixel;

      // Draw original image to screen.
      e->Graphics->DrawImage( newImage, destPara1, srcRect, units );

      // Create parallelogram for drawing adjusted image.
      Point ulCorner2 = Point(325,100);
      Point urCorner2 = Point(550,100);
      Point llCorner2 = Point(375,250);
      array<Point>^ destPara2 = {ulCorner2,urCorner2,llCorner2};

      // Create image attributes and set large gamma.
      ImageAttributes^ imageAttr = gcnew ImageAttributes;
      imageAttr->SetGamma( 4.0F );

      // Draw adjusted image to screen.
      e->Graphics->DrawImage( newImage, destPara2, srcRect, units, imageAttr );
   }

private void DrawImageParaRectAttrib(PaintEventArgs e)
{
    // Create image.
    Image newImage = Image.FromFile("SampImag.jpg");
             
    // Create parallelogram for drawing image.
    Point ulCorner1 = new Point(100, 100);
    Point urCorner1 = new Point(325, 100);
    Point llCorner1 = new Point(150, 250);
    Point[] destPara1 = {ulCorner1, urCorner1, llCorner1};
             
    // Create rectangle for source image.
    Rectangle srcRect = new Rectangle(50, 50, 150, 150);
    GraphicsUnit units = GraphicsUnit.Pixel;
             
    // Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units);
             
    // Create parallelogram for drawing adjusted image.
    Point ulCorner2 = new Point(325, 100);
    Point urCorner2 = new Point(550, 100);
    Point llCorner2 = new Point(375, 250);
    Point[] destPara2 = {ulCorner2, urCorner2, llCorner2};
             
    // Create image attributes and set large gamma.
    ImageAttributes imageAttr = new ImageAttributes();
    imageAttr.SetGamma(4.0F);
             
    // Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, imageAttr);
}

Private Sub DrawImageParaRectAttrib(ByVal e As PaintEventArgs)

    ' Create image.
    Dim newImage As Image = Image.FromFile("SampImag.jpg")

    ' Create parallelogram for drawing image.
    Dim ulCorner1 As New Point(100, 100)
    Dim urCorner1 As New Point(325, 100)
    Dim llCorner1 As New Point(150, 250)
    Dim destPara1 As Point() = {ulCorner1, urCorner1, llCorner1}

    ' Create rectangle for source image.
    Dim srcRect As New Rectangle(50, 50, 150, 150)
    Dim units As GraphicsUnit = GraphicsUnit.Pixel

    ' Draw original image to screen.
    e.Graphics.DrawImage(newImage, destPara1, srcRect, units)

    ' Create parallelogram for drawing adjusted image.
    Dim ulCorner2 As New Point(325, 100)
    Dim urCorner2 As New Point(550, 100)
    Dim llCorner2 As New Point(375, 250)
    Dim destPara2 As Point() = {ulCorner2, urCorner2, llCorner2}

    ' Create image attributes and set large gamma.
    Dim imageAttr As New ImageAttributes
    imageAttr.SetGamma(4.0F)

    ' Draw adjusted image to screen.
    e.Graphics.DrawImage(newImage, destPara2, srcRect, units, _
    imageAttr)
End Sub

Remarks

The destPoints parameter specifies three points of a parallelogram. The three Point structures represent the upper-left, upper-right, and lower-left corners of the parallelogram. The fourth point is extrapolated from the first three to form a parallelogram.

The srcRect parameter specifies a rectangular portion of theimage object to draw. This portion is scaled and sheared to fit inside the parallelogram specified by the destPoints parameter.

See also

• Images, Bitmaps, and Metafiles