Constructs the inverse of a transform.

graphics-ports

invert-transform `transform` &optional `into` => `inverse`

transform⇩ |
A transform object. |

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

inverse |
A transform object. |

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.

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

*CAPI User Guide and Reference Manual (Macintosh version) - 01 Dec 2021 19:31:44*