![]() It is the area where the two rectangles of objects overlapped. We will call this overlapping rectangle rectangle. In the second case, we have to define what was the collision area (which in the case of surrounding rectangles gives us a new rectangle). Notice that in the first case our work is finished. On the other hand, if there is a collision between the surrounding polygons then there is the possibility that there was a collision between objects. ![]() In case there is no collision between the surrounding polygons, it is impossible to collide between objects. To optimize the process, we first define whether there is a collision between the object's surrounding polygons (assuming rectangles). In general, the transparent color is associated with the number 0 (zero). The main point to begin defining a pixel collision detection function (or method) is to understand that bitmaps images are stored as repeating whole numbers along the bitmap. Based on the pixels in which the overlap is detected, you can tell which side of a rectangle the collision occurred. It is important to keep in mind, as you will see, that this type of procedure, although effective, is extremely costly in terms of processing. If you need to perform a perfect detection, you can do pixel-level detection.
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