I'm drawing nodes on to a window, and when you click them I want it select the node and color it a different colour. And then it might go off and do something else, and I want it to return the original color.
Is there a way of drawing on to an overlapping layer, and then just undisplay that layer?
Ie, rather than having to go through and redraw everything again.
Similarly - if I'm want a 'drag to draw line', how would I do this?
