I'm trying to figure out how to properly draw shapes dynamically on various
image formats such as tiffs,jpgs, gifs, etc... by dynamically I mean
capturing the mouse events and draw the shapes according to the current
mouse position...

i'm not clear on how this is done over an image.  I can understand how to do
it over a blank background by drawing the previous shape in the background
color and drawing the new shape in a different color. But, what about
images? Is there a special way to do this? I'm trying to use JAI as well?
I've seen an example where the graphics were set to XOR Mode? Any ideas?

Thanks!
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