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I would like to be able to draw anywhere on the screen, so I think I should create a transparent, fullscreen, undecorated window.

The problem is, all events pass through the window. I'd like to catch a mouse-move event and use it.

Any ideas? Might I be able to do this in a higher-level library?

Zack Michener
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Simply take a screen capture and make a full screen window filled with those pixels. You won't get live update but you will be able to process the mouse and keyboard events however you like.

Jared Updike
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