Drawing lines and shapes

DrawSelector

There is certainly room for improvement. For example, the drawing surface used should really have been a subclass of a Java Canvas, and the buttons should be greyed out at the right times, but on the whole this does the job it was meant to do. Later on, more consideration will be given to user interfaces.

In the words of a sagging grey-haired well known sports personality (over there), How do they do that?

• DrawSelector. contains some standard user interface widgets that control a DrawSelectorCanvas
• DrawSelectorCanvas. The animated drawing surface that draws the lines. The animated behaviour is inherited from ThreadedCanvas.
• ThreadedCanvas. The real workhorse This manages the offscreen bitmap needed for animated behaviour.