untransform-points

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 function untransform-points 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.