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Graphics.DrawArc Method (Pen, RectangleF, Single, Single)

Draws an arc representing a portion of an ellipse specified by a RectangleF structure.

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

public void DrawArc(
	Pen pen,
	RectangleF rect,
	float startAngle,
	float sweepAngle


Type: System.Drawing.Pen

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

Type: System.Drawing.RectangleF

RectangleF structure that defines the boundaries of the ellipse.

Type: System.Single

Angle in degrees measured clockwise from the x-axis to the starting point of the arc.

Type: System.Single

Angle in degrees measured clockwise from the startAngle parameter to ending point of the arc.


pen is null

This method draws an arc that is a portion of the perimeter of an ellipse. The ellipse is defined by the boundaries of a rectangle. The arc is the portion of the perimeter of the ellipse between the startAngle parameter and the startAngle + sweepAngle parameters.

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 a rectangle to bound an ellipse.

  • Defines the start (45 degrees) and sweep (270 degrees) angles.

  • Draws the elliptical arc to the screen.

The result is a partial ellipse missing a segment between + and - 45 degrees of the x axis.

private void DrawArcRectangleF(PaintEventArgs e)
    // Create pen.
    Pen blackPen= new Pen(Color.Black, 3);

    // Create rectangle to bound ellipse.
    RectangleF rect = new RectangleF(0.0F, 0.0F, 100.0F, 200.0F);

    // Create start and sweep angles on ellipse. 
    float startAngle =  45.0F;
    float sweepAngle = 270.0F;

    // Draw arc to screen.
    e.Graphics.DrawArc(blackPen, rect, startAngle, sweepAngle);

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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