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if rectangles map to rectangles after coordinate transformation
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filling large rectangles. This optimization fails if
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the coordinate transformation distorts the shape of rectangles.
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>void (*) (PLFLT, PLFLT, PLFLT *, PLFLT *, PLPointer)
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> Pointer to function that defines transformation between indices
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world coordinates (C only). Transformation functions are
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provided in the PLplot library: