wumpus-core

Copperbox revision 1484.

I've re-implemented the affine transformations on Paths. Paths are not in an affine space / affine frame - so manipulating them cannot really follow the interpretations of affine geometry (notionally Paths have a zero point that stands as an origin, but they don't have basis vectors).

As they can't follow the affine interpretation, the allowed transformations (translate, rotate, scale) follow what one might expect visually. Rotate - rotates about the start point. Scale - scales with respect to the start point. Translate - simply displaces by the supplied vector.

For standard affine translations, Paths and Primitives should always be lifted to Pictures where transformations respect the affine frame. However for efficiency reasons having some (non-affine) transformations on Paths and Primitives is valuable.