untransform-distance Function

Summary

Transforms a distance by the rotation and scale of the inverse of a given transform.

Package

graphics-ports

Signature

untransform-distance transform dx dy => x, y

Arguments

transform⇩	A transform.
dx⇩	A real number.
dy⇩	A real number.

Values

x	A real number.
y	A real number.

Description

The function untransform-distance transforms the distance (dx dy) by the rotation and scale of the effective inverse of transform. The translation in the inverse transform is ignored. The transformed distance is returned as two values.

Notes

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

See also

graphics-state
transform