Collision Detection

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For example, hitting an enemy with bullets in a platformer, or running over powerups in a racing game, among others. Collision detection in a game may seem tough, but there is an easy method. All you have to ask yourself, is what does it really mean when an object is colliding with another?</div> <bR> <div> When 2 objects colide, in programming terms, then they are overlapping each other at some point.</div> <bR> <div> The colored areas are where the two rectangles intersect each other. By now, you should be getting a general idea of the algorithm. You might also be thinking, "shut up and get to the bloody point and show me the code!". Allright, I will. ~_^</div> <bR> <bR> <div> #define true 1</div> <div> #define false 0</div> <div> int CheckForCollision(int X1, int Y1, int W1, int H1, int X2, int Y2, int W2, int H2) // x/y locations of the two objects, and their widths and heights.</div> <div> {</div> <div> if (X1+W1 < X2) return false; // object1 is to the left of object2.</div> <div> if (X1 > X2+W2) return false; // object1 is to the right of object2.</div> <div> if (Y1+H1 < Y2) return false; // object1 is above object2.</div> <div> if (Y1 > Y2+H2) return false; // object1 is below object2.</div> <div> return true; //if it gets here, they overlap.</div> <div> }</div> <bR> <bR> <div> Simple, no? Much faster than checking each individual pixel. Hopefully, someone will find this useful.</div> <bR> <bR> </td> </tr></table></body>