In this video I once and for all solve axis aligned rectangle collision detection, demonstrating algorithms to handle arbitrary size rectangle vs rectangle collisions and collision resolution, applicable to "rectangle soups" or tile map based interactions. 

Source: https://github.com/OneLoneCoder/Javidx9/blob/master/PixelGameEngine/SmallerProjects/OneLoneCoder_PGE_Rectangles.cpp

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