QM_ScaleMatrix

QM_ScaleMatrix(matrixRec; scaleH; scaleV; anchorH; anchorV):error
	matrixRec	Array real	Matrix record
	scaleH	Real	Horizontal scaling factor
	scaleV	Real	Vertical scaling factor
	anchorH	Real	Horizontal coordinate of the anchor point
	anchorV	Real	Vertical coordinate of the anchor point
	error	Longint	Error result

Adds a scaling transformation to a matrix record.

Parameter matrixRec specifies the matrix. It must be declared as a 3 x 3 array of reals. QMedia updates and returns the contents matrixRec with the specified scaling operation.

Parameters scaleH and scaleV specify the horizontal and vertical scaling factors respectively.

Parameters anchorH and anchorV specify the horizontal and vertical coordinates of the anchor point.

Example

`Scale track ID $trackID of movie $movie by 50% horizontally and vertically

ARRAY REAL($matrix;3;3)

$err:=QM_GetTrackMatrix ($movie;$trackID;$matrix)

$err:=QM_ScaleMatrix ($matrix;0.5;0.5;0;0)

$err:=QM_SetTrackMatrix ($movie;$trackID;$matrix)

Related commands

QM_SetIdentityMatrix	Sets the contents of a matrix record to the identity matrix.
QM_TranslateMatrix	Adds a translation transformation to a matrix record.
QM_RotateMatrix	Adds a rotation transformation to a matrix record.
QM_SkewMatrix	Adds a skew transformation to a matrix record.
QM_ConcatMatrix	Concatenates two matrices.
QM_SetTrackMatrix	Changes the track's transormation matrix.
QM_GetTrackMatrix	Returns the track's transormation matrix.