Double-tap to draw
Recognize a double-tap to change to drawing mode. Could also do triple-tap to change to erase. Or let user assign the action.
5
votes
Eric Mockensturm
shared this idea
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Mike
commented
It's not exactly the same thing but you can do a three-finger drag to the left of the screen to undo and a three-finger drag to the right to redo.
Hope this helps you!