.NET Common Language Runtime Unleashed

System.Drawing

This namespace provides classes and support for construction and display of arbitrary graphical objects.

A few examples of using classes in this namespace can be found in the ImageProcessing application in Appendix A,“C# Basics.”

You can also find a simple example in the Scribble directory. You create two cached variables:

private Graphics graphics = null;
private Point lastPoint;

When you click on a mouse button, the OnMouseDown event handler is called, the Graphics object is created, and the current point is saved.

graphics = CreateGraphics();
lastPoint = new Point(e.X, e.Y);

When the mouse button is released, the Graphics object is destroyed.

graphics.Dispose();
graphics = null;

The OnMouseMove handler is called and a ...