LispWorks CAPI Reference Manual > 2 GP Reference Entries

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untransform-points

Function
Summary

Transforms a list of points by the inverse of a given transform.

Package

graphics-ports

Signature

untransform-points transform points &optional into => result

Arguments

transform

A transform.

points

A list of pairs of real numbers.

into

A list.

Values

result

A list of pairs of real numbers.

Description

The untransform-points function transforms a list of alternating ( x y ) pairs in points by the effective inverse of transform . If into is supplied it must be a list the same length as points . If into is not supplied, a new list is returned.


LispWorks CAPI Reference Manual - 21 Dec 2009

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