Tetris Piece Rotation Algorithm

Question

What are the best algorithms (and explanations) for representing and rotating the pieces of a tetris game? I always find the piece rotation and representation schemes confu

Answer 1

If you're doing this in python, cell-based instead of coordinate pairs it's very simple to rotate a nested list.

rotate = lambda tetrad: zip(*tetrad[::-1])

# S Tetrad
tetrad = rotate([[0,0,0,0], [0,0,0,0], [0,1,1,0], [1,1,0,0]])