Anamorphic Projections Written by Paul Bourke January 1991 Source: glues.h and glues.c. Anamorphism is a Macintosh utility which takes a line drawing as a PICT file and performs various nonlinear distortions upon it. The distortions available have been chosen from those which have been used historically by artists (and forgers).

Each of the different distortions will be illustrated by using the following simple diagram.

For the following examples an additional grid will be placed over the image to further illustrate the nature of the distortion. Each type of distortion has controls associated with it, these are indicated by black "blobs" at the current position of the control points. To vary these parameters simply click and drag the control points.

Cylindrical

Conical

Spherical

Parabolic

Rectonical

Notes

• The only PICT drawing primitives which can be used are line segments.

• Since the distortions are non linear, the distorted points alone a line segment do not lie in a straight line between the distorted end points of the line segment. Thus each line is split into a number of line segments in order to approximate the generally curved nature of the distorted lines. The result of this is distorted drawings with a much larger number of line segments.