Sometimes in graphics we would like to be able to create some sort of figure that could be controlled from a BASIC program. For example, we might wish to create the drawing of a pattern and then make it expand, contract, rotate, and so on. This can be done on graphics computers which feature shape graphics as part of the BASIC language. An example would be the Apple's shape tables and the statements DRAW n AT x1, y1, ROT = , and SCALE = . This feature is invaluable when you are using the computer to create highly detailed images or when you want to use the screen as a menu and move shapes with a light pen or digitizing pen.

* See, for example, Mitchell Waite and Michael Pardee, BASIC Primer, Indianapolis: Howard W. Sams & Co., Inc., 1978.
Return to Table of Contents | Previous Section | Next Section