Exercises
The use of forces is one of your most powerful tools for customizing your game. Here are a collection of problems to let you try this out. In doing these problems, don’t forget that when you get into tweaking one particular game mode, it saves time to have the Pop program start up in the game mode that you want to play with. The way to control this is to edit the CPopDoc constructor in popdoc.cpp. Simply comment in exactly the one setGameClass line corresponding to the game you want to play. If you make a new game class, add a line for it.
Exercise 7.1: Changing the relative sizes of the critters and the world
The critters sometimes show forces better if you make them smaller. There are two ways you might make them smaller: (a) change ...
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