On Sun, 2003-12-14 at 12:11, bulia byak wrote:
I think this is wrong. First, the order of selecting objects may (in complex drawings) entirely depend on how convenient is each object for selecting. Second, one may select both objects with one rubberband, in which case the "order" is undefined. And third, when I prepare to do difference, I need to see and adjust the edge of the future shape, which means I need the subtracted shape to be on top because it will determine the shape of the cut-out. When I subtract bottom from top, I may end up with a quite unexpected shape because I don't see what I'm subtracting.
Agreed -- there's also a fourth advantage of subtracting the top shape; conceptually, it's like using the top shape to punch holes in the shapes below it. I think that works better with our basic intuition about things.
-mental