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Rotating 2D arrays

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hi, say I have an array of points (2D) [9][9] in a standard pattern: 000000000 000000000 000000000 000000000 000000000 000000000 000000000 000000000 000000000 how can I rotate them all about 45 degrees? say I have the origin as the point at [0][9] - and I rotate them all around that.... it''d basically end up looking like an isometric diamond... any help is much appreciated.. Jack,

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