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Cool DHTML: Animating Objects Within Irregular Shapes : Page 2

This article shows you how to use JavaScript and DHTML to animate a small ball within an arbitrary closed area, and provides a simple solution for determining the bounce angle of the ball from any point on the border of the enclosing area.


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Step 1. Drawing the Area
First, select and draw an area. For this example, use an area that is symmetric along its vertical axis (see Figure 2).


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