Perfect shapes and lines
Draw the line or shape wanted and freeze for a few seconds, triggering the wobbly line to automatically change to perfectly straight lines and shapes. Pressing undo will take away the perfect shape, back to the freehanded lined shape if desired. If user wants a perfect circle, draw a freehanded imperfect circle, freeze and hold briefly, triggering the drawn circle to turn into a perfect one. Much like the built in iPhone picture editing.
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Amanda Graham commented
Truly a must have in art for quick, non frustrating lines and shapes.