Forum Moderators: coopster
You might have to make it so that if somebody draws a circle, the computer recognizes it as that, assigns it a value of "circle", then searches for all occurences of "circle".
You would most likely have to have a set of preapproved images that people can draw, otherwise it would be impossible for the computer to match the two together.
Something you might want to check out: there'a firefox extension called Mouse Gestures. If you hold down the right mouse button and move the mouse, it will draw a line. Different lines do different things. For instance, a vertical line opens a new tab, an "L" shape closes the tab, going from right to left is the same as hitting the 'back' button, etc...
I'm not sure how it works exactly, but it reads the shape you made, then performs a specified action.
Good luck! Sounds like it could be a pretty cool feature!