Make a blackboard that can be used with Jupyter notebooks

Sometime I want to visualise something while I am working in a notebook. This is that.

TODO:

• Need to have an undo function
  • Think I have to save all objects and redraw...
• Need to have a save function
• Need to stop the bug where if you go off the canvas and then come back on the line starts from the last point
• Auto-scale canvas size
• Adjustable line width

Usage

import Blackboard

jb = Blackboard.JupyterBlackboard()

jb.Draw()