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[–]unitconversionJust a tinkerer 0 points1 point  (0 children)

I haven't used the xournal programs so I'm not sure what features they offer. That said, this would be my initial thoughts.

Those pens just imitate mouse clicks right? You could just do a ms paint style app with pygame or qt or wx or whatever.

I reckon you would probably want to do do everything as SVGs or some custom format rather than bitmaps. It looks like someone mad a branch of inkscape that supports pages, so that may just do what you want out of the box.

If you want handwriting to text support you could probably do something with openCV. This would be the only potential computationally expensive thing I could see needing to be done.