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I made some gestures for the "enhanced iPDF" viewer, or the only one active there is the "quick erase" function (draw something and hold the pen still for a second before release - turns the drawing into an 'erase' line, removing anything below it). I have a different version that allowed me to change the color and pen thickness by drawing a vertical or horizontal line.
It is easy to include such functionality in iPDF, but not using the built in character recognition (or at least I guess that would be difficult). However, one should probably use some kind of existing library for gestures and then define some. Say, a Z for zoom, an N for a new page, that kind of thing. I also like to change pen color (adding color based on the gray tone when converting scribbles to pdfs), when taking notes, but the current interface is so in-efficient that I can't be bothered.
Rincewind
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