skidracer: Thanks but regretably I've forgotton how to matrix transformations in the last ooh 15 years or so (since I last programmed 3D lol). So what am I supposed to do with the [dy,-dx] result? Is my original vector a matrix like this [dx,dy]? and am I supposed add the matrices or multiply them?
Hmm, let's work this out. Say dx = 0 and dy = 1 (it should point down/South on the screen (or up on a graph)), 90 degrees clockwise would be pointing left/West. So dx will end up being -1 and dy will end up being 0. Hmm, I don't get how that links to the [dy,-dx] matrix. Help please experts!
Hmm, let's work this out. Say dx = 0 and dy = 1 (it should point down/South on the screen (or up on a graph)), 90 degrees clockwise would be pointing left/West. So dx will end up being -1 and dy will end up being 0. Hmm, I don't get how that links to the [dy,-dx] matrix. Help please experts!