Preliminary Snapping when Dragging and Dropping - III - Things I might do differently

OK, so firstly, my snapping works well now:

And will I think be OK for the pretty simple cases I want to play with at the moment (those example sheets with two bits of text on every side and two more in the middle are not simple...)

But having played with it a bit, I think I'll move over to a different form, which will be slightly hard in one way, but much more intuitive.

The problem is, as you drag a sheet, you drag all its snap-points and you are trying to match them against all the stationary ones, meaning you may be looking at a different part altogether when a snap-point in the opposite corner brushes against some other one you weren't even thinking about and suddenly your sheet snaps to what initially looks like some random position.

Far too ChAotIc to live in the wild, I think.

So what I'll do instead is:

1. introduce different draw styles for "active" and "inactive" snap-points
2. make snap-points "active" as you mouse over them
   1. there will be at most one of these at a time
3. if, when you start to drag, if there is no active snap-point, disable snapping and stop drawing any snap-points
   1. this will be a pure "human adjust" mode with no machine assistance
   2. (I already have holding shift as a "fine adjust" control that slows down translation and rotation, I'll probably make that force you into non-snapping mode too...)
4. if when you start to drag, there is an active snap-point, then that alone will snap onto any of the stationary ones
   1. meaning you will always have an "active" thing to look at, close to the mouse cursor, and any snapping will involve that and make Perfect Sense (tm) to the user