Problem:
Say, you touch the screen with the pen; drag the pen to a new
location; then lift the pen. You also want a visible box to show the
selected area. You want the box to be erased and redrawn
as the pen is moved but erased when the pen is lifted.
The problem is that, as the pen moves and the box erased and redrawn,
the image beneath it is also erased. What is the technique used to do
this and not destroy any underlying image?
Redrawing the whole image each time the pen moves seems kind of
slow. There must be an easier way. Anyone?
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