Canvas is designed to make moving objects around with a mouse easy. Therefore, when you press a button and start moving the mouse, the current
is the canvas object that you're moving, i.e. it doesn't change as you move the mouse pointer over the grid. Currently, I have no idea how to implement a "pen" in Canvas.
To make the sterling and degree work, you must save the script as UTF-8 and add use utf8; towards the top. Also, you might need to encode or decode the strings coming to or from Tk (finding the exact way is left as an exercise for the reader).
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