I recall experimenting with similar approaches about 2 decades ago; depending on your gestures you can actually simplify a lot: - normalize the draw height/wid

I recall experimenting with similar approaches about 2 decades ago; depending on your gestures you can actually simplify a lot: - normalize the draw height/width - use polar coordinates before normalizing - normalize the length of the drawn path - DAG to recognize shapes faster, using partial paths - only taking into account corners with angles over a certain treshold - ... The possibilities are endless, and this is a good exercise to explain that slight alterations on your problem space can have a huge impact on your solution space. [update - formatting]