DrawArc Method (Pen, Int32, Int32, Int32, Int32, Int32, Int32)

Graphics.DrawArc Method (Pen, Int32, Int32, Int32, Int32, Int32, Int32)

 

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,
	int x,
	int y,
	int width,
	int height,
	int startAngle,
	int sweepAngle
)

Parameters

pen
Type: System.Drawing.Pen

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

x
Type: System.Int32

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

y
Type: System.Int32

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

width
Type: System.Int32

Width of the rectangle that defines the ellipse.

height
Type: System.Int32

Height of the rectangle that defines the ellipse.

startAngle
Type: System.Int32

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

sweepAngle
Type: System.Int32

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

Exception Condition
ArgumentNullException

pen is null.

-or-

rects is null.

ArgumentNullException

rects is a zero-length array.

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 DrawArcInt(PaintEventArgs e)
{
    // Create pen.
    Pen blackPen= new Pen(Color.Black, 3);

    // Create coordinates of rectangle to bound ellipse.
    int x = 0;
    int y = 0;
    int width = 100;
    int height = 200;

    // Create start and sweep angles on ellipse.
    int startAngle =  45;
    int sweepAngle = 270;

    // Draw arc to screen.
    e.Graphics.DrawArc(blackPen, x, y, width, height, startAngle, sweepAngle);
}

.NET Framework
Available since 1.1
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