Matrix.transformDistance

void transformDistance(ref double dx, ref double dy)

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

This is similar to pango.matrix.Matrix.transformPoint, 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.

Parameters

`dx`	in/out X component of a distance vector
`dy`	in/out Y component of a distance vector