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Having and object follow a given path...

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Hey everyone.. I'm trying to get an object (for example a ball) to follow a predefined path. This is usually no big deal, but I need the path to include curves and lines, instead of one or the other. My problem is I have zero idea on how to go about implementing this. With lines, i just give it a start and end x, y coordinate, and the ball follows that line using basic calculations for distance with my given speed. With curves, i'm not entirely sure how to tell the ball to follow a curve. The path will be the exact same every time, and never move at all. Anyway...ideas? I'm pretty much stuck. Thanks in advance. Not that it should matter, but C++,, SDL. c edit: To give you an idea of what i wanna go for, think of Motion Guides in Flash. ;)

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