I have a multitouch touch screen and want to control a dial object in a circular mode.
So far I have successfully defined the the patching rectangle of the dial, scaled and offset the finger tracking input so that the centre coordinates of the dial read X0. Y0.
My problem is that cartopol positions 0. degrees at 3o'clock on the dial and then gives readings of 0. to -179. degress in a clockwise motion and 0. to 179 in an anti clockwise motion. I need to somehow scale and/or offset this reading so that 0. is at 6 o'clock and 359. is 1 degree to the right.
I'd also be interested to hear about any other touch screen projects using the TUIO protocol.