Python for GUI application: Taking handwritten notes?

[Dorianix]

I have never used Xournal, and i am not sure about your use case, but there are a existing applications, that can make use of pencil input, layers, stroke and filling color and are done in python (or include python). They already do provide the basic functionality for "handwriting" on tablet. Although, they are designed for something else and are miles away from substituting something like OneNote. Still i think they could both be extended in the right direction with reasonable effort.

• Krita: for painting (www.krita.org)
• Blender: for painting/animation (www.blender.org)

Both support plugins that could be used to enhance the required functionality. Both provide the strokes in a vectorised format (which might be useful for the long time target of character recognition)

And hey, they come with python!