Graphics::DrawArc Method (Pen^, RectangleF, Single, Single)
Draws an arc representing a portion of an ellipse specified by a RectangleF structure.
Assembly: System.Drawing (in System.Drawing.dll)
Parameters
- pen
-
Type:
System.Drawing::Pen^
Pen that determines the color, width, and style of the arc.
- rect
-
Type:
System.Drawing::RectangleF
RectangleF structure that defines the boundaries of the ellipse.
- startAngle
-
Type:
System::Single
Angle in degrees measured clockwise from the x-axis to the starting point of the arc.
- sweepAngle
-
Type:
System::Single
Angle in degrees measured clockwise from the startAngle parameter to ending point of the arc.
| Exception | Condition |
|---|---|
| ArgumentNullException | 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.
private: 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 ); }
Available since 1.1