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plstransform: Set a global coordinate transform function
DESCRIPTION:
This function is used in examples 19 and 22.
SYNOPSIS:
plstransform(coordinate_transform, coordinate_transform_data)
ARGUMENTS:
coordinate_transform (void (*) (PLFLT, PLFLT, PLFLT *, PLFLT *,
PLPointer) , input) : Pointer to a function that defines a
transformation from the input (x, y) coordinate to a new plot
world coordinate. A NULL pointer means that no transform is
applied.
coordinate_transform_data (PLPointer, input) : Optional extra data
for
coordinate_transform.
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