3.5 The Transformations Used by CLIM

3.5.2 CLIM Transformation Protocol

transformation [Protocol Class]
The protocol class of all transformations. There are one or more subclasses of transformation that implement transformations, the exact names of which are explicitly unspecified. If you want to create a new class that behaves like a transformation, it should be a subclass of transformation. Subclasses of transformation obey the transformation protocol.

All of the instantiable transformation classes provided by CLIM are immutable.

transformationp [Function]
Returns t if object is a transformation; otherwise, it returns nil.

+identity-transformation+ [Constant]
An instance of a transformation that is guaranteed to be an identity transformation, that is, the transformation that "does nothing."

transformation-error [Error Condition]
The class that is the superclass of the following three conditions. This class is a subclass of error.

transformation-underspecified [Error Condition]
The error that is signaled when make-3-point-transformation is given three collinear image points.

reflection-underspecified [Error Condition]
The error that is signaled when make-reflection-transformation is given two coincident points.

singular-transformation [Error Condition]
The error that is signaled when invert-transformation is called on a singular transformation, that is, a transformation that has no inverse.

CLIM 2.0 User's Guide - OCT 1998

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