collision detection with irregular shape

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hello i am making game in which i am making shape like diamond using ccdrawpoly method .

and i have sprit object with ball.png and i want to detect collision with this polygon (diamond shape) .

in short ball do not go through inside the shape please help me.......


Your diamond can likely be separated into a set of more basic shapes that can be used to do the intersection math more easily (triangles, squares)