invert-transform Function

Summary

Constructs the inverse of a transform.

Package

graphics-ports

Signature

invert-transform transform &optional into => inverse

Arguments

transform⇩	A transform object.
into⇩	A transform object or nil.

Values

inverse

A transform object.

Description

The function invert-transform constructs the inverse of transform. If T is transform and T' is its inverse, then TT' = I. If into is non-nil it is modified to contain T' and returned, otherwise a new transform is constructed and returned.

Notes

See graphics-state for details of how a transform is used.

See also

graphics-state
transform