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Important: The information in this document is obsolete and should not be used for new development.

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Inside Macintosh: QuickDraw GX Environment and Utilities /
Chapter 8 - QuickDraw GX Mathematics / Using QuickDraw GX Mathematics

Resetting a Mapping

You can use the ResetMapping function to reset a mapping. The following code example first uses the ResetMapping function to initialize the destination to the identity matrix, and then uses RotateMapping to calculate a resultant mapping that rotates by a given angle about a specified center.

gxMapping *RotationMap(gxMapping *dest, Fixed angle, 
                        gxPoint *center)
    return RotateMapping(ResetMapping(dest), angle, 
The ResetMapping function is described on page 8-64.

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© Apple Computer, Inc.
7 JUL 1996