I'm trying to do some simple gesture recognition. Circles, I'm assuming, will simply be a set of points which are all within some specified distance range from center. Lines on the other hand, I'm not as clear on lines. I guess one would take the equation of lines of interest (horizontal, vertical, and 45 degree diagonal) and see if the ys are close enough to the given xs?
Are these valid and efficient techniques? Is there anything better?'
Many thanks in advance