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Simple Lua function for checking bounding box collisions
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| function rect_colliding(x1,y1, w1, h1, x2, y2, w2, h2) | |
| return x1 < x2 + w2 and x2 < x1 + w1 and y1 < y2 + h2 and y2 < y1 + h1 | |
| end |
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