cairoMatrixTransformDistance
Transforms the distance vector (dx,dy) by matrix. This is
similar to cairoMatrixTransformPoint except that the translation
components of the transformation are ignored. The calculation of
the returned vector is as follows:
cairoMatrixTransformDistance(matrix, dx, dy)
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[numeric] X component of a distance vector. An in/out parameter |
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[numeric] Y component of a distance vector. An in/out parameter |
dx2 = dx1 * a + dy1 * c; dy2 = dx1 * b + dy1 * d;
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.
Derived by RGtkGen from GTK+ documentation
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