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

 
System_CAPS_noteNote

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Draws an arc representing a portion of an ellipse specified by a pair of coordinates, a width, and a height.

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

public:
void DrawArc(
	Pen^ pen,
	float x,
	float y,
	float width,
	float height,
	float startAngle,
	float sweepAngle
)

Parameters

pen
Type: System.Drawing::Pen^

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

x
Type: System::Single

The x-coordinate of the upper-left corner of the rectangle that defines the ellipse.

y
Type: System::Single

The y-coordinate of the upper-left corner of the rectangle that defines the ellipse.

width
Type: System::Single

Width of the rectangle that defines the ellipse.

height
Type: System::Single

Height of the rectangle that defines 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 the position and size of 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 DrawArcFloat( PaintEventArgs^ e )
   {
      // Create pen.
      Pen^ blackPen = gcnew Pen( Color::Black,3.0f );

      // Create coordinates of rectangle to bound ellipse.
      float x = 0.0F;
      float y = 0.0F;
      float width = 100.0F;
      float height = 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, x, y, width, height, startAngle, sweepAngle );
   }

.NET Framework
Available since 1.1
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