Graphics::DrawLine Method (Pen^, Single, Single, Single, Single)

 

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

Namespace:   System.Drawing
Assembly:  System.Drawing (in System.Drawing.dll)

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

Parameters

pen
Type: System.Drawing::Pen^

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

x1
Type: System::Single

The x-coordinate of the first point.

y1
Type: System::Single

The y-coordinate of the first point.

x2
Type: System::Single

The x-coordinate of the second point.

y2
Type: System::Single

The y-coordinate of the second point.

Exception Condition
ArgumentNullException

pen is null.

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

The following code example is designed for use with Windows Forms, and it requires PaintEventArgse, 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 );
   }

.NET Framework
Available since 1.1
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