Inside Macintosh: OpenDoc Class Reference /

Part 1 - Classes and Methods / ODTransform

SetMatrix

The SetMatrix method replaces this transform's matrix with the specified matrix.

ODTransform SetMatrix (in ODMatrix matrix);

matrix

The new transform matrix for this transform.

return value

A reference to this transform with it matrix replaced.

DISCUSSION

If you specify an identity matrix, the effect of this method is the same as calling the Reset method.

If you use transforms of the class ODTransform and you have also created a subclass of ODTransform that applies complex transformation effects that cannot be represented by matrices, your part needs to check whether a given transform has a matrix before calling this method. To do so, you should call the transform's HasMatrix method; only if that method returns true should you call the transform's SetMatrix method.

OVERRIDING

If you subclass ODTransform to create a nonlinear transform class, you must override this method. Your override method must not call its inherited method. Instead, it should raise a kODErrTransformErr exception. You can detect that a transform of your class has no matrix by calling its HasMatrix method.

EXCEPTION

kODErrTransformErr

This transform object does not use a matrix.

SEE ALSO

The ODMatrix type (page 888).
The ODTransform::GetMatrix method (page 768).
The ODTransform::HasMatrix method (page 772).
The ODTransform::Reset method (page 781).