How to: Create Figures from Lines, Curves, and Shapes

 

To create a figure, construct a GraphicsPath, and then call methods, such as AddLine and AddCurve, to add primitives to the path.

Example

The following code examples create paths that have figures:

  • The first example creates a path that has a single figure. The figure consists of a single arc. The arc has a sweep angle of –180 degrees, which is counterclockwise in the default coordinate system.

  • The second example creates a path that has two figures. The first figure is an arc followed by a line. The second figure is a line followed by a curve followed by a line. The first figure is left open, and the second figure is closed.

GraphicsPath path = new GraphicsPath();
path.AddArc(175, 50, 50, 50, 0, -180);
e.Graphics.DrawPath(new Pen(Color.FromArgb(128, 255, 0, 0), 4), path);
     // Create an array of points for the curve in the second figure.
     Point[] points = {
new Point(40, 60),
new Point(50, 70),
new Point(30, 90)};

     GraphicsPath path = new GraphicsPath();

     path.StartFigure(); // Start the first figure.
     path.AddArc(175, 50, 50, 50, 0, -180);
     path.AddLine(100, 0, 250, 20);
     // First figure is not closed.

     path.StartFigure(); // Start the second figure.
     path.AddLine(50, 20, 5, 90);
     path.AddCurve(points, 3);
     path.AddLine(50, 150, 150, 180);
     path.CloseFigure(); // Second figure is closed.

     e.Graphics.DrawPath(new Pen(Color.FromArgb(255, 255, 0, 0), 2), path);

Compiling the Code

The previous examples are designed for use with Windows Forms, and they require PaintEventArgs e, which is a parameter of the Paint event handler.

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