> Hi Michael. Many tablet stylii are double-ended. the other end having the
> function of an eraser in bitmap programs. So i think it could be possible to
> use the "eraser" end of a stylus to draw a closed curve that could auto-trim
> (or auto-split) any curves that fall within it's area.

Yes, this would certainly be an easy way to trigger it.


> Of course, it would be necessary that the eraser curve is closed automatically

This is the part that I would worry about - forcing a closed curve is not really how a typical eraser works. Like in Photoshop for instance if you want to erase something you can just scribble the eraser over inked areas, you don't have to form a closed region with it or anything, instead there is a zone around your cursor that is always being erased.

But doing a sort of structured-closed-curve erase like you are describing would be a lot easier to implement though.

However there could be some other nice possibilities for the "real eraser" style - for instance there could be some accuracy features if you start erasing a curve and track along it and start to snap at key points like intersections with other curves.

It will be a while before I'll be able to experiement with any of this though.

- Michael