Graphics.DrawLine Method

Definition

Namespace:

System.Drawing

Assembly:

System.Drawing.Common.dll

Draws a line connecting the two points specified by the coordinate pairs.

Overloads

DrawLine(Pen, Int32, Int32, Int32, Int32)	Draws a line connecting the two points specified by the coordinate pairs.
DrawLine(Pen, Single, Single, Single, Single)	Draws a line connecting the two points specified by the coordinate pairs.
DrawLine(Pen, Point, Point)	Draws a line connecting two Point structures.
DrawLine(Pen, PointF, PointF)	Draws a line connecting two PointF structures.

DrawLine(Pen, Int32, Int32, Int32, Int32)

Draws a line connecting the two points specified by the coordinate pairs.

public:
 void DrawLine(System::Drawing::Pen ^ pen, int x1, int y1, int x2, int y2);

public void DrawLine (System.Drawing.Pen pen, int x1, int y1, int x2, int y2);

member this.DrawLine : System.Drawing.Pen * int * int * int * int -> unit

Public Sub DrawLine (pen As Pen, x1 As Integer, y1 As Integer, x2 As Integer, y2 As Integer)

Parameters

pen

Pen

Pen that determines the color, width, and style of the line.

x1

Int32

The x-coordinate of the first point.

y1

Int32

The y-coordinate of the first point.

x2

Int32

The x-coordinate of the second point.

y2

Int32

The y-coordinate of the second point.

Exceptions

ArgumentNullException

pen is null.

Examples

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

• Creates a black pen.

• Creates the coordinates of the endpoints of the line.

• Draws the line to the screen.

public:
   void DrawLineInt( PaintEventArgs^ e )
   {
      // Create pen.
      Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

      // Create coordinates of points that define line.
      int x1 = 100;
      int y1 = 100;
      int x2 = 500;
      int y2 = 100;

      // Draw line to screen.
      e->Graphics->DrawLine( blackPen, x1, y1, x2, y2 );
   }

public void DrawLineInt(PaintEventArgs e)
{
             
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);
             
    // Create coordinates of points that define line.
    int x1 = 100;
    int y1 = 100;
    int x2 = 500;
    int y2 = 100;
             
    // Draw line to screen.
    e.Graphics.DrawLine(blackPen, x1, y1, x2, y2);
}

Public Sub DrawLineInt(ByVal e As PaintEventArgs)

    ' Create pen.
    Dim blackPen As New Pen(Color.Black, 3)

    ' Create coordinates of points that define line.
    Dim x1 As Integer = 100
    Dim y1 As Integer = 100
    Dim x2 As Integer = 500
    Dim y2 As Integer = 100

    ' Draw line to screen.
    e.Graphics.DrawLine(blackPen, x1, y1, x2, y2)
End Sub

Remarks

This method draws a line connecting the two points specified by the x1, y1, x2, and y2 parameters.

See also

• Using a Pen to Draw Lines and Shapes

DrawLine(Pen, Single, Single, Single, Single)

Draws a line connecting the two points specified by the coordinate pairs.

public:
 void DrawLine(System::Drawing::Pen ^ pen, float x1, float y1, float x2, float y2);

public void DrawLine (System.Drawing.Pen pen, float x1, float y1, float x2, float y2);

member this.DrawLine : System.Drawing.Pen * single * single * single * single -> unit

Public Sub DrawLine (pen As Pen, x1 As Single, y1 As Single, x2 As Single, y2 As Single)

Parameters

pen

Pen

Pen that determines the color, width, and style of the line.

x1

Single

The x-coordinate of the first point.

y1

Single

The y-coordinate of the first point.

x2

Single

The x-coordinate of the second point.

y2

Single

The y-coordinate of the second point.

Exceptions

ArgumentNullException

pen is null.

Examples

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

• Creates a black pen.

• Creates the coordinates of the endpoints of the line.

• Draws the line to the screen.

public:
   void DrawLineFloat( PaintEventArgs^ e )
   {
      // Create pen.
      Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

      // Create coordinates of points that define line.
      float x1 = 100.0F;
      float y1 = 100.0F;
      float x2 = 500.0F;
      float y2 = 100.0F;

      // Draw line to screen.
      e->Graphics->DrawLine( blackPen, x1, y1, x2, y2 );
   }

public void DrawLineFloat(PaintEventArgs e)
{
             
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);
             
    // Create coordinates of points that define line.
    float x1 = 100.0F;
    float y1 = 100.0F;
    float x2 = 500.0F;
    float y2 = 100.0F;
             
    // Draw line to screen.
    e.Graphics.DrawLine(blackPen, x1, y1, x2, y2);
}

Public Sub DrawLineFloat(ByVal e As PaintEventArgs)

    ' Create pen.
    Dim blackPen As New Pen(Color.Black, 3)

    ' Create coordinates of points that define line.
    Dim x1 As Single = 100.0F
    Dim y1 As Single = 100.0F
    Dim x2 As Single = 500.0F
    Dim y2 As Single = 100.0F

    ' Draw line to screen.
    e.Graphics.DrawLine(blackPen, x1, y1, x2, y2)
End Sub

Remarks

This method draws a line connecting the two points specified by the x1, y1, x2, and y2 parameters.

See also

• Using a Pen to Draw Lines and Shapes

DrawLine(Pen, Point, Point)

Draws a line connecting two Point structures.

public:
 void DrawLine(System::Drawing::Pen ^ pen, System::Drawing::Point pt1, System::Drawing::Point pt2);

public void DrawLine (System.Drawing.Pen pen, System.Drawing.Point pt1, System.Drawing.Point pt2);

member this.DrawLine : System.Drawing.Pen * System.Drawing.Point * System.Drawing.Point -> unit

Public Sub DrawLine (pen As Pen, pt1 As Point, pt2 As Point)

Parameters

pen

Pen

Pen that determines the color, width, and style of the line.

pt1

Point

Point structure that represents the first point to connect.

pt2

Point

Point structure that represents the second point to connect.

Exceptions

ArgumentNullException

pen is null.

Examples

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

• Creates a black pen.

• Creates points for the endpoints of the line.

• Draws the line to the screen.

public:
   void DrawLinePoint( PaintEventArgs^ e )
   {
      // Create pen.
      Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

      // Create points that define line.
      Point point1 = Point(100,100);
      Point point2 = Point(500,100);

      // Draw line to screen.
      e->Graphics->DrawLine( blackPen, point1, point2 );
   }

public void DrawLinePoint(PaintEventArgs e)
{
             
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);
             
    // Create points that define line.
    Point point1 = new Point(100, 100);
    Point point2 = new Point(500, 100);
             
    // Draw line to screen.
    e.Graphics.DrawLine(blackPen, point1, point2);
}

Public Sub DrawLinePoint(ByVal e As PaintEventArgs)

    ' Create pen.
    Dim blackPen As New Pen(Color.Black, 3)

    ' Create points that define line.
    Dim point1 As New Point(100, 100)
    Dim point2 As New Point(500, 100)

    ' Draw line to screen.
    e.Graphics.DrawLine(blackPen, point1, point2)
End Sub

See also

• Using a Pen to Draw Lines and Shapes

DrawLine(Pen, PointF, PointF)

Draws a line connecting two PointF structures.

public:
 void DrawLine(System::Drawing::Pen ^ pen, System::Drawing::PointF pt1, System::Drawing::PointF pt2);

public void DrawLine (System.Drawing.Pen pen, System.Drawing.PointF pt1, System.Drawing.PointF pt2);

member this.DrawLine : System.Drawing.Pen * System.Drawing.PointF * System.Drawing.PointF -> unit

Public Sub DrawLine (pen As Pen, pt1 As PointF, pt2 As PointF)

Parameters

pen

Pen

Pen that determines the color, width, and style of the line.

pt1

PointF

PointF structure that represents the first point to connect.

pt2

PointF

PointF structure that represents the second point to connect.

Exceptions

ArgumentNullException

pen is null.

Examples

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

• Creates a black pen.

• Creates points for the endpoints of the line.

• Draws the line to the screen.

public:
   void DrawLinePointF( PaintEventArgs^ e )
   {

      // Create pen.
      Pen^ blackPen = gcnew Pen( Color::Black,3.0f );
      
      // Create points that define line.
      PointF point1 = PointF(100.0F,100.0F);
      PointF point2 = PointF(500.0F,100.0F);

      // Draw line to screen.
      e->Graphics->DrawLine( blackPen, point1, point2 );
   }

public void DrawLinePointF(PaintEventArgs e)
{
             
    // Create pen.
    Pen blackPen = new Pen(Color.Black, 3);
             
    // Create points that define line.
    PointF point1 = new PointF(100.0F, 100.0F);
    PointF point2 = new PointF(500.0F, 100.0F);
             
    // Draw line to screen.
    e.Graphics.DrawLine(blackPen, point1, point2);
}

Public Sub DrawLinePointF(ByVal e As PaintEventArgs)

    ' Create pen.
    Dim blackPen As New Pen(Color.Black, 3)

    ' Create points that define line.
    Dim point1 As New PointF(100.0F, 100.0F)
    Dim point2 As New PointF(500.0F, 100.0F)

    ' Draw line to screen.
    e.Graphics.DrawLine(blackPen, point1, point2)
End Sub

Remarks

This method draws a line connecting the two points specified by the pt1 and p2 parameters.

See also

• Using a Pen to Draw Lines and Shapes