Graphics Paths in GDI+

Paths are combination of lines, rectangles, simple curves, and other vector images. To draw a path you use the GraphicsPath object.

The following illustration shows a path created by combining a line, an arc, a Bézier spline, and a cardinal spline.

Drawing a Path

To draw a path, call the DrawPath method of the Graphics object. The Pen object is passed as an argument. The other argument is the GraphicsPath object.

The GraphicsPath class provides the following methods for creating a sequence of items to be drawn: AddLine, AddRectangle, AddEllipse, AddArc, AddPolygon, AddCurve (for cardinal splines), and AddBezier.

Below is the syntax of DrawPath method:

The following code example shows how to draw a path that consists of a line, an ellipse, and a bezier spline:

Dim myImage As New Bitmap(300, 300, Imaging.PixelFormat.Format32bppRgb) Dim myGraphics As Graphics = Graphics.FromImage(myImage) myGraphics.Clear(Color.White) Dim myPen As New Pen(Color.Blue, 2) 'create Path object Dim myPath As New GraphicsPath myPath.AddLine(0, 0, 30, 20) myPath.AddEllipse(20, 20, 20, 40) myPath.AddBezier(30, 60, 70, 60, 50, 30, 100, 10) 'draw a path myGraphics.DrawPath(myPen, myPath) myImage.Save(Response.OutputStream, Imaging.ImageFormat.Jpeg)