I've used a thoughts and discoveries from Jens and Myredneptune to create a new scrollign system that has the map rotate under the sprite - good for a racing or flying game.
Check out this helicopter, controlled with the arrow keys, flying over a rather sparse map.
http://scratch.mit.edu/projects/Mayhem/33629
The map rotates but it rotates around its current x/y position. I need help with the geometry to make it appear as though the map's centre of rotation is actually under the helicopter.
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Hence the need for gemetry, to calculate how the individual map sections should be moved to simulate their rotational origin being under the helicopter.
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What you need are "transformation matrices". These are sometimes taught in linear algebra classes, and almost always taught in computer graphics and computer vision classes (generally sophomore or junior level college classes, though the math is really no harder than trigonometry).
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