Tetris Piece Rotation Algorithm

Posted by coppercoder on Stack Overflow See other posts from Stack Overflow or by coppercoder
Published on 2008-10-24T14:49:54Z Indexed on 2010/05/02 12:07 UTC
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tetris

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rotation

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game

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piece

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algorithm

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 confusing.

Most tetris games seem to use a naive "remake the array of blocks" at each rotation:

http://www.codeplex.com/Project/ProjectDirectory.aspx?ProjectSearchText=tetris

However, some use pre-built encoded numbers and bit shifting to represent each piece:

http://www.codeplex.com/wintris

Is there a method to do this using mathematics (not sure that would work on a cell based board)?

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