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