Graphics.DrawImage 方法

参考

定义

命名空间:: System.Drawing

程序集:: System.Drawing.Common.dll

程序集:: System.Drawing.dll

包:: System.Drawing.Common v8.0.6

包:: System.Drawing.Common v9.0.0-preview.5.24306.5

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

绘制位于指定位置且大小为原始大小的指定 Image。

重载

DrawImage(Image, Single, Single, RectangleF, GraphicsUnit)	在指定位置绘制图像的一部分。
DrawImage(Image, Effect, RectangleF, Matrix, GraphicsUnit, ImageAttributes)
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, IntPtr)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Int32, Int32, Int32, Int32)	在指定位置绘制指定的 Image，并指定大小。
DrawImage(Image, Single, Single, Single, Single)	在指定位置绘制指定的 Image，并指定大小。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Effect)
DrawImage(Image, Point)	使用指定位置的原始物理大小绘制指定的 Image。
DrawImage(Image, Point[])	使用指定的形状和大小在指定位置绘制指定的 Image。
DrawImage(Image, PointF)	使用指定位置的原始物理大小绘制指定的 Image。
DrawImage(Image, PointF[])	使用指定的形状和大小在指定位置绘制指定的 Image。
DrawImage(Image, Rectangle)	在指定位置绘制指定的 Image，并指定大小。
DrawImage(Image, RectangleF)	在指定位置绘制指定的 Image，并指定大小。
DrawImage(Image, Int32, Int32, Rectangle, GraphicsUnit)	在指定位置绘制图像的一部分。
DrawImage(Image, Single, Single)	使用指定位置的原始物理大小绘制指定的 Image。
DrawImage(Image, Point[], Rectangle, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, PointF[], RectangleF, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Rectangle, Rectangle, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, RectangleF, RectangleF, GraphicsUnit)	在指定位置绘制指定 Image 的指定部分，并指定大小。
DrawImage(Image, Int32, Int32)	使用其原始物理大小在坐标对指定的位置绘制指定的图像。
DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes)	在指定位置绘制指定 Image 的指定部分。

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制图像的一部分。

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)

参数

image: Image

要绘制的 Image。

x: Single

绘制图像左上角的 x 坐标。

y: Single

绘制图像左上角的 y 坐标。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 Image 部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建绘制图像左上角的坐标。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

源矩形的大小决定了未缩放的原始图像的哪个部分绘制到屏幕。

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

注解

Image 存储像素宽度的值和水平分辨率的值（每英寸点数）。图像的物理宽度（以英寸为单位）是像素宽度除以水平分辨率。例如，像素宽度为 360 的图像，水平分辨率为每英寸 72 个点，物理宽度为 5 英寸。类似的备注适用于像素高度和物理高度。

此方法使用图像的物理大小绘制图像的一部分，因此，无论显示设备的分辨率（每英寸点数）如何，图像部分的大小都将以英寸为单位。例如，假设图像部分的像素宽度为 216，水平分辨率为每英寸 72 点。如果调用此方法在分辨率为 96 点/英寸的设备上绘制该图像部分，则呈现的图像部分的像素宽度将为（216/72）*96 = 288。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Effect, RectangleF, Matrix, GraphicsUnit, ImageAttributes)

Source:: Graphics.cs

Source:: Graphics.cs

public void DrawImage (System.Drawing.Image image, System.Drawing.Imaging.Effects.Effect effect, System.Drawing.RectangleF srcRect = default, System.Drawing.Drawing2D.Matrix? transform = default, System.Drawing.GraphicsUnit srcUnit = System.Drawing.GraphicsUnit.Pixel, System.Drawing.Imaging.ImageAttributes? imageAttr = default);

member this.DrawImage : System.Drawing.Image * System.Drawing.Imaging.Effects.Effect * System.Drawing.RectangleF * System.Drawing.Drawing2D.Matrix * System.Drawing.GraphicsUnit * System.Drawing.Imaging.ImageAttributes -> unit

Public Sub DrawImage (image As Image, effect As Effect, Optional srcRect As RectangleF = Nothing, Optional transform As Matrix = Nothing, Optional srcUnit As GraphicsUnit = System.Drawing.GraphicsUnit.Pixel, Optional imageAttr As ImageAttributes = Nothing)

参数

image: Image

effect: Effect

srcRect: RectangleF

transform: Matrix

srcUnit: GraphicsUnit

imageAttr: ImageAttributes

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: Point[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

Graphics.DrawImageAbort 委托，该委托指定要在图像绘制过程中调用的方法。此方法经常调用，以检查是否根据应用程序确定的条件停止执行 DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) 方法。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。代码首先为 Graphics.DrawImageAbort 委托定义回调方法;该定义简单化，仅测试 DrawImage 方法是否使用 null callBackData 参数调用它。该示例的主体执行以下操作：

创建 Graphics.DrawImageAbort 回调方法的实例：
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、不调整的平行四边形，位置将定位在屏幕上的图像，矩形的大小以及平行影像的大小和形状决定了绘制图像的缩放和剪切。

由于此示例使用不传递 callBackData 参数的重载，因此 Graphics.DrawImageAbort 回调返回 true，这会导致 DrawImage 方法结束，示例中包含的异常处理代码将输出异常文本，而不是绘制图像。

   // 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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

具有 callback 参数的此重载提供了在根据应用程序确定的条件启动图像时停止图像绘制的方法。例如，应用程序可以开始绘制大型图像，用户可能会在屏幕上滚动图像，在这种情况下，应用程序可以停止绘图。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: PointF[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

Graphics.DrawImageAbort 委托，该委托指定要在图像绘制过程中调用的方法。此方法经常调用，以检查是否根据应用程序确定的条件停止执行 DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) 方法。

例外

ArgumentNullException

image null。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、不调整的平行四边形，位置将定位在屏幕上的图像，矩形的大小以及平行影像的大小和形状决定了绘制图像的缩放和剪切。

   // 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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: Point[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

callbackData: Int32

指定在检查是否停止执行 DrawImage(Image, Point[], Rectangle, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) 方法时要使用的 Graphics.DrawImageAbort 委托的其他数据的值。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、不调整的平行四边形，位置将定位在屏幕上的图像，矩形的大小以及平行影像的大小和形状决定了绘制图像的缩放和剪切。

由于此示例使用传递 callBackData 参数的重载，因此 Graphics.DrawImageAbort 回调返回 false，这会导致 DrawImage 方法继续，并且该示例将调整后的图像绘制到屏幕。

   // 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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

具有 callback 和 callbackData 参数的此重载提供了一种根据应用程序确定的条件和数据启动图像时停止绘制的方法。例如，应用程序可以开始绘制大型图像，用户可能会在屏幕上滚动图像，在这种情况下，应用程序可以停止绘图。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: PointF[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

callbackData: Int32

指定在检查是否停止执行 DrawImage(Image, PointF[], RectangleF, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort, Int32) 方法时要使用的 Graphics.DrawImageAbort 委托的其他数据的值。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 PaPaint 事件处理程序的参数。代码首先为 Graphics.DrawImageAbort 委托定义回调方法;该定义简单化，仅测试 DrawImage 方法是否使用 null callBackData 参数调用它。该示例的主体执行以下操作：

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、不调整的平行四边形，位置将定位在屏幕上的图像，矩形的大小以及平行影像的大小和形状决定了绘制图像的缩放和剪切。

   // 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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Int32

要绘制的源图像部分左上角的 x 坐标。

srcY: Int32

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Int32

要绘制的源图像部分的宽度。

srcHeight: Int32

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的目标矩形。
创建源矩形的坐标，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

目标矩形的位置将定位屏幕上的图像，源矩形和目标矩形的大小决定了所绘制图像的缩放，源矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

要绘制的 image 对象的 srcX、srcY、srcWidth和 srcHeight 参数指定要绘制的矩形部分。该矩形相对于源图像的左上角。此部分进行缩放以适合由 destRect 参数指定的矩形内。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Int32

要绘制的源图像部分左上角的 x 坐标。

srcY: Int32

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Int32

要绘制的源图像部分的宽度。

srcHeight: Int32

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的目标矩形。
创建源矩形的坐标，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标矩形，位置将定位在屏幕上的图像，源矩形和目标矩形的大小决定了绘制图像的缩放比例，源矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Single

要绘制的源图像部分左上角的 x 坐标。

srcY: Single

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Single

要绘制的源图像部分的宽度。

srcHeight: Single

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttrs: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的目标矩形。
创建源矩形的坐标，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Int32

要绘制的源图像部分左上角的 x 坐标。

srcY: Int32

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Int32

要绘制的源图像部分的宽度。

srcHeight: Int32

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttr: ImageAttributes

ImageAttributes，指定 image的重新着色和伽玛信息。

callback: Graphics.DrawImageAbort

Graphics.DrawImageAbort 委托，该委托指定要在图像绘制过程中调用的方法。此方法经常调用，以检查是否根据应用程序确定的条件停止执行 DrawImage(Image, Rectangle, Int32, Int32, Int32, Int32, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) 方法。

例外

ArgumentNullException

image null。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义在其中绘制图像的目标矩形的点。
创建源矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他目标矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标矩形，位置将定位在屏幕上的图像，源矩形的大小以及目标矩形的大小和形状决定了绘制图像的缩放。

   // 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

注解

要绘制的 image 对象的 srcX、srcY、srcWidth和 srcHeight 参数指定要绘制的矩形部分。该矩形相对于源图像的左上角。此部分进行缩放以适应由 destRect 对象指定的矩形内。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Single

要绘制的源图像部分左上角的 x 坐标。

srcY: Single

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Single

要绘制的源图像部分的宽度。

srcHeight: Single

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttrs: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

Graphics.DrawImageAbort 委托，该委托指定要在图像绘制过程中调用的方法。此方法经常调用，以检查是否根据应用程序确定的条件停止执行 DrawImage(Image, Rectangle, Single, Single, Single, Single, GraphicsUnit, ImageAttributes, Graphics+DrawImageAbort) 方法。

例外

ArgumentNullException

image null。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义在其中绘制图像的目标矩形的点。
创建源矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他目标矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标矩形，位置将定位在屏幕上的图像，源矩形的大小以及目标矩形的大小和形状决定了绘制图像的缩放。

   // 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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Int32

要绘制的源图像部分左上角的 x 坐标。

srcY: Int32

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Int32

要绘制的源图像部分的宽度。

srcHeight: Int32

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttrs: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

callbackData: IntPtr
nativeint

指定在检查是否停止执行 DrawImage 方法时要使用的 Graphics.DrawImageAbort 委托的其他数据的值。

例外

ArgumentNullException

image null。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义在其中绘制图像的目标矩形的点。
创建源矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他目标矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标矩形，位置将定位在屏幕上的图像，源矩形的大小以及目标矩形的大小和形状决定了绘制图像的缩放。

   // 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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Single

要绘制的源图像部分左上角的 x 坐标。

srcY: Single

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Single

要绘制的源图像部分的宽度。

srcHeight: Single

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

imageAttrs: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

callback: Graphics.DrawImageAbort

callbackData: IntPtr
nativeint

指定在检查是否停止执行 DrawImage 方法时要使用的 Graphics.DrawImageAbort 委托的其他数据的值。

例外

ArgumentNullException

image null。

示例

创建 Graphics.DrawImageAbort 回调方法的实例。
从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义在其中绘制图像的目标矩形的点。
创建源矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他目标矩形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标矩形，位置将定位在屏幕上的图像，源矩形的大小以及目标矩形的大小和形状决定了绘制图像的缩放。

   // 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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcX: Single

要绘制的源图像部分左上角的 x 坐标。

srcY: Single

要绘制的源图像部分左上角的 y 坐标。

srcWidth: Single

要绘制的源图像部分的宽度。

srcHeight: Single

要绘制的源图像部分的高度。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定用于确定源矩形的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建要在其中绘制图像的目标矩形的坐标。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

目标矩形的位置将定位在屏幕上的图像，源矩形和目标矩形的大小决定了所绘制图像的缩放，源矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定的 Image，并指定大小。

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)

参数

image: Image

要绘制的 Image。

x: Int32

绘制图像左上角的 x 坐标。

y: Int32

绘制图像左上角的 y 坐标。

width: Int32

绘制图像的宽度。

height: Int32

所绘制图像的高度。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建要在其中绘制图像的矩形的位置和大小。
将图像绘制到屏幕。

矩形的位置将定位在屏幕上的图像，原始图像的大小和矩形的大小决定了绘制图像的缩放。

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

注解

由 x、y、width和 height 参数定义的矩形决定了绘制图像的位置和大小。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定的 Image，并指定大小。

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)

参数

image: Image

要绘制的 Image。

x: Single

绘制图像左上角的 x 坐标。

y: Single

绘制图像左上角的 y 坐标。

width: Single

绘制图像的宽度。

height: Single

所绘制图像的高度。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建要在其中绘制图像的矩形的位置和大小。
将图像绘制到屏幕。

矩形的位置将定位在屏幕上的图像，原始图像的大小和矩形的大小决定了绘制图像的缩放。

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

注解

由 x、y、width和 height 参数定义的矩形决定了绘制图像的位置和大小。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: PointF[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的目标并行影像的点。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、未调整的目标平行影像，位置将定位在屏幕上的图像、源矩形的大小以及目标平行影像的大小和形状决定了绘制图像的缩放和剪切，矩形的大小决定了原始图像的哪个部分被绘制到屏幕。

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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Effect)

Source:: Graphics.cs

Source:: Graphics.cs

public:
 void DrawImage(System::Drawing::Image ^ image, System::Drawing::Imaging::Effects::Effect ^ effect);

public void DrawImage (System.Drawing.Image image, System.Drawing.Imaging.Effects.Effect effect);

member this.DrawImage : System.Drawing.Image * System.Drawing.Imaging.Effects.Effect -> unit

Public Sub DrawImage (image As Image, effect As Effect)

参数

image: Image

effect: Effect

适用于

DrawImage(Image, Point)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用指定位置的原始物理大小绘制指定的 Image。

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)

参数

image: Image

要绘制的 Image。

point: Point

Point 结构，表示绘制图像左上角的位置。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个点，用于绘制图像的左上角。
将未缩放的图像绘制到屏幕。

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

注解

Image 存储像素宽度的值和水平分辨率的值（每英寸点数）。图像的物理宽度（以英寸为单位）是像素宽度除以水平分辨率。例如，像素宽度为 216 的图像，水平分辨率为 72 点/英寸，物理宽度为 3 英寸。类似的备注适用于像素高度和物理高度。

此方法使用其物理大小绘制图像，因此无论显示设备的分辨率（每英寸点数）如何，图像都将具有正确的大小（英寸）。例如，假设图像的像素宽度为 216，水平分辨率为每英寸 72 点。如果调用此方法在分辨率为 96 点/英寸的设备上绘制该图像，则呈现的图像的像素宽度将为（216/72）*96 = 288。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Point[])

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用指定的形状和大小在指定位置绘制指定的 Image。

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())

参数

image: Image

要绘制的 Image。

destPoints: Point[]

三个定义平行四边形的 Point 结构的数组。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
将图像绘制到屏幕。

平行四边形的位置将定位屏幕上的图像，原始图像的大小以及平行四边形的大小和形状决定了绘制图像的缩放和剪切。

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

注解

destPoints 参数指定并行四边形的三点。三个 Point 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

由 image 参数表示的图像进行缩放和剪切，以适应由 destPoints 参数指定的平行四边形图的形状。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, PointF)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用指定位置的原始物理大小绘制指定的 Image。

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)

参数

image: Image

要绘制的 Image。

point: PointF

PointF 表示绘制图像左上角的结构。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个点，用于绘制图像的左上角。
将未缩放的图像绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, PointF[])

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用指定的形状和大小在指定位置绘制指定的 Image。

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())

参数

image: Image

要绘制的 Image。

destPoints: PointF[]

三个定义平行四边形的 PointF 结构的数组。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
将图像绘制到屏幕。

平行四边形的位置将定位屏幕上的图像，原始图像的大小以及平行四边形的大小和形状决定了绘制图像的缩放和剪切。

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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

由 image 对象表示的图像进行缩放和剪切，以适应由 destPoints 参数指定的平行四边形图的形状。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Rectangle)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定的 Image，并指定大小。

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)

参数

image: Image

要绘制的 Image。

rect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的矩形。
将图像绘制到屏幕。

矩形的位置将定位在屏幕上的图像，原始图像的大小和矩形的大小决定了绘制图像的缩放。

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

注解

由 image 对象表示的图像缩放为 rect 矩形的尺寸。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, RectangleF)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定的 Image，并指定大小。

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)

参数

image: Image

要绘制的 Image。

rect: RectangleF

RectangleF 结构，用于指定绘制图像的位置和大小。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的矩形。
将图像绘制到屏幕。

矩形的位置将定位屏幕上的图像，图像的原始大小以及矩形的大小决定了绘制图像的缩放。

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

注解

由 image 对象表示的图像缩放为 rect 矩形的尺寸。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制图像的一部分。

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)

参数

image: Image

要绘制的 Image。

x: Int32

绘制图像左上角的 x 坐标。

y: Int32

绘制图像左上角的 y 坐标。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建绘制图像左上角的坐标。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

源矩形的大小决定了未缩放的原始图像的哪个部分绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Single, Single)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用指定位置的原始物理大小绘制指定的 Image。

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)

参数

image: Image

要绘制的 Image。

x: Single

绘制图像左上角的 x 坐标。

y: Single

绘制图像左上角的 y 坐标。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建绘制图像左上角的点的坐标。
将未缩放的图像绘制到屏幕。

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

注解

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destPoints: Point[]

三个定义平行四边形的 Point 结构的数组。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将图像绘制到屏幕。

平行影像的位置将定位在屏幕上的图像，矩形的大小以及平行四边形的大小和形状决定了绘制图像的缩放和剪切。

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

注解

destPoints 参数指定并行四边形的三点。三个 Point 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destPoints: PointF[]

三个定义平行四边形的 PointF 结构的数组。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的目标并行影像的点。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

目标平行影像的位置将定位在屏幕上的图像、源矩形的大小以及目标平行影像的大小和形状决定了绘制图像的缩放和剪切，矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

destPoints 参数指定并行四边形的三点。三个 PointF 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Rectangle, Rectangle, GraphicsUnit)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destRect: Rectangle

Rectangle 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的目标矩形。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

目标矩形的位置将定位在屏幕上的图像，源矩形和目标矩形的大小决定了所绘制图像的缩放，源矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分进行缩放以适合由 destRect 参数指定的矩形内。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, RectangleF, RectangleF, GraphicsUnit)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分，并指定大小。

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)

参数

image: Image

要绘制的 Image。

destRect: RectangleF

RectangleF 结构，用于指定绘制图像的位置和大小。图像缩放以适应矩形。

srcRect: RectangleF

RectangleF 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建一个要在其中绘制图像的目标矩形。
创建一个源矩形，从中提取图像的一部分。
将源矩形的度量单位设置为像素。
将图像绘制到屏幕。

目标矩形的位置将定位在屏幕上的图像，源矩形和目标矩形的大小决定了所绘制图像的缩放，源矩形的大小决定了原始图像的哪个部分绘制到屏幕。

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

注解

srcRect 参数指定要绘制的 image 对象的矩形部分。此部分进行缩放以适合由 destRect 参数指定的矩形内。

另请参阅

图像、位图和图元文件

适用于

DrawImage(Image, Int32, Int32)

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

使用其原始物理大小在坐标对指定的位置绘制指定的图像。

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)

参数

image: Image

要绘制的 Image。

x: Int32

绘制图像左上角的 x 坐标。

y: Int32

绘制图像左上角的 y 坐标。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg 示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建绘制图像左上角的点的坐标。
绘制未缩放的图像。

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

注解

DrawImage 方法使用其物理大小绘制图像，因此无论显示设备的分辨率（每英寸点数）如何，图像都将具有正确的大小（英寸）。例如，假设图像的像素宽度为 216，水平分辨率为每英寸 72 点。如果调用 DrawImage 在分辨率为 96 点/英寸的设备上绘制该图像，则呈现的图像的像素宽度将为（216/72）*96 = 288。

另请参阅

图像、位图和图元文件

适用于

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

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

Source:: Graphics.cs

在指定位置绘制指定 Image 的指定部分。

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);

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)

参数

image: Image

要绘制的 Image。

destPoints: Point[]

三个定义平行四边形的 Point 结构的数组。

srcRect: Rectangle

Rectangle 结构，指定要绘制的 image 对象的部分。

srcUnit: GraphicsUnit

GraphicsUnit 枚举的成员，该枚举指定 srcRect 参数使用的度量单位。

imageAttr: ImageAttributes

指定 image 对象的重新着色和伽马信息 ImageAttributes。

例外

ArgumentNullException

image null。

示例

下面的代码示例设计用于 Windows 窗体，它需要 PaintEventArgse，这是 Paint 事件处理程序的参数。该代码执行以下操作：

从示例文件夹中 SampImag.jpg JPEG 文件创建映像。
创建用于定义要在其中绘制图像的并行四边形的点。
创建一个矩形以选择要绘制的图像部分。
将图形绘图单位设置为像素。
将原始图像绘制到屏幕。
创建一个用于绘制调整图像的其他平行四边形。
创建并设置调整后图像的属性，使之具有比平常更大的伽玛值。
将调整后的图像绘制到屏幕。

对于原始的、不调整的平行四边形，位置将定位在屏幕上的图像，矩形的大小以及平行影像的大小和形状决定了绘制图像的缩放和剪切。

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

注解

destPoints 参数指定并行四边形的三点。三个 Point 结构表示平行四边形的左上角、右上角和左下角。第四个点从前三个推断为形成平行四边形。

srcRect 参数指定要绘制的image 对象的矩形部分。此部分是缩放和剪切的，以适应由 destPoints 参数指定的平行四边形图。

另请参阅

图像、位图和图元文件

适用于

通过

Graphics.DrawImage 方法

定义

重载

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

参数

例外

示例

注解

另请参阅

适用于

DrawImage(Image, Effect, RectangleF, Matrix, GraphicsUnit, ImageAttributes)

参数

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例

注解

另请参阅

适用于

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

参数

例外

示例