Am Fr 30. Mai 2008 schrieb Fabian Off: > Hey! > > How does synaptics handle this? When I look at the output my touchpad does, I can see "X Y Fingers" Values... Maybe we could look into this code and see how they do detect the amount of fingers? Dunno whether they work nearly the same, but I believe this could maybe point us into the right direction :) > > Only my idea... 2-finger-scrolling is so great!
To the best of my knowledge, at least MY synaptics in front of me right now is a capacitive type, and even this one doesn't support multitouch right now (though maybe a driver issue). Please google or wp for capacitive vs resistive ts! Our 4-wire resistive type ts is a device as dumb as bread, NO silicon inside. You simply can't do muto with such device in a reasonable straight way. How do you get info of X1,Y1,X2,Y2 out of a device with 4 ANALOG connectors (GND incl!)??? It may be feasible, but it's rather tricky and needs quite some special hw AROUND the silicon-free ts. There's a way to detect the "surrounding square" of _all_ touchpoints on a 4w-R-ts, at least with GTA02 i think. You may use this to detect there's more than one touchpoint. Still you have no correct data for the coords of the 2 (or 3?) points. Maybe eventually I'll write a little article on it - so I don't have to repeat myself all the time ;-) /j
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