Graphics.DrawLine Method (Pen, Single, Single, Single, Single) (System.Drawing)

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.NET Framework Class Library

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)

Syntax

Visual Basic

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

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

Visual C++

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

member DrawLine : 
        pen:Pen * 
        x1:float32 * 
        y1:float32 * 
        x2:float32 * 
        y2:float32 -> unit

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.

Exceptions

Exception	Condition
ArgumentNullException	pen is null.

Remarks

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

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.

Visual Basic


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


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);
}

Visual C++


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 );
   }

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

Graphics Class

DrawLine Overload

System.Drawing Namespace

Other Resources

Using a Pen to Draw Lines and Shapes