Method

PangoMatrixtransform_distance

since: 1.16

Declaration [src]

void
pango_matrix_transform_distance (
  const PangoMatrix* matrix,
  double* dx,
  double* dy
)

Description [src]

Transforms the distance vector (dx,dy) by matrix.

This is similar to pango_matrix_transform_point(), except that the translation components of the transformation are ignored. The calculation of the returned vector is as follows:

dx2 = dx1 * xx + dy1 * xy;
dy2 = dx1 * yx + dy1 * yy;

Affine transformations are position invariant, so the same vector always transforms to the same vector. If (x1,y1) transforms to (x2,y2) then (x1+dx1,y1+dy1) will transform to (x1+dx2,y1+dy2) for all values of x1 and x2.

Available since: 1.16

Parameters

matrix

Type: PangoMatrix

A PangoMatrix.

The argument can be NULL.

dx

Type: double*

In/out X component of a distance vector.

The argument will be modified by the function.

dy

Type: double*

In/out Y component of a distance vector.

The argument will be modified by the function.