DescriptionUses ranging algorithms to filter through the random noise created when two, or more fingers are touching the screen and approximates the general location of both fingers.
It's a rather simple idea. When the touch screen tries to coordinatize two or more touch inputs, it can't because of hardware limitations, and it instead returns a point that is the midpoint between all the touch inputs. If you monitor the returned point over several frames, the point moves erratically between the two touch inputs (given that they do not apply too much pressure), and by using ranges, you can determine, with some precision and accuracy, the general location of both the fingers.
It detects a two finger input 70-80 percent correctly, and it has something like a 60 percent success rate when reading two fingers, however it is much better at determining the angle produced than it is the locations. InstructionsTouch the screen gently with both fingers for best effect.