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)

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.

Exception Condition

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 PaintEventArgse, 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.

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

      // Create rectangle to bound ellipse.
      RectangleF rect = 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 );

.NET Framework
Available since 1.1
Return to top