A simple example of DrawPad demo-ing the state pattern.

State pattern applied to the mouse class when handling different drawing operations.

• Draw rectangle. 2 clicks. First click for top left, second click for bottom right.
• Draw circle. 2 clicks. First click for center, second click for radius.
• Draw ellipse. 2 clicks. To specify out-bound rectangle, first click for top left, second click for bottom right.
• Draw triangle. 3 clicks. Three clicks for each top.
• Draw arc. 3 clicks. First click for center, second click for begin, third click for end.
• Draw polygon. N clicks. Double click or click on the start point to finish.