[DUG] Layers with draw or paint

[Marshland Engineering]

I'm trying to simulate a CNC machine. I have the graphics derived from my 
CNC code working but would now like to add a tool shape. How do I float a 
shape over a canvas. What I think I need is  layers where image on the top layer 
floats over the bottom image.

The other option is record the screen image before the tool, move the tool 
over the recorded area and then replace when moved passed.

Any suggestions ?

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