Inside Macintosh: QuickTime /

Chapter 2 - Movie Toolbox / Movie Toolbox Reference

Matrix Functions /

GetMatrixType

The GetMatrixType function allows your application to obtain information about a matrix. This information indicates the nature of the transformation defined by the matrix.

pascal short GetMatrixType (MatrixRecordPtr m);

m

Points to the matrix for this operation.

DESCRIPTION

The GetMatrixType function returns an integer that indicates the nature of the transformation defined by the matrix. The following values are possible:

identityMatrixType

Indicates that the specified matrix is an identity matrix.

translateMatrixType

Indicates that the specified matrix defines a translation operation.

scaleMatrixType

Indicates that the specified matrix defines a scaling operation.

scaleTranslateMatrixType

Indicates that the specified matrix defines both a translation operation and a scaling operation.

linearMatrixType

Indicates that the specified matrix defines a rotation, skew, or shear operation.

linearTranslateMatrixType

Indicates that the specified matrix defines both a translation operation and a rotation, skew, or shear operation.

perspectiveMatrixType

Indicates that the specified matrix defines a perspective (nonlinear) operation.

ERROR CODES

None