UI long term development perspective: physics engine

Ian Stirling openmoko at mauve.plus.com
Sun Apr 1 20:04:41 CEST 2007


Florent THIERY wrote:
> Would it be possible to get video captures or raw measurements of the
> touchscreen's reported coordinates?
> 
> For instance, i'm pretty curious to know what exactly the touchscreen
> sees when  you touch the screen with 2 fingers at the same time, when
> you move them, when you move only one of the 2, etc....
> 
> I'm also interested in knowing how precise the touchscreen is (ex:
> refresh rate, possible pressure indication, ...).

Basically.
The output is the center of the bounding box of the touched area.
Pressure has little, but not no effect. Almost no effect on a single 
touch, on a double touch, the relative pressures will have a slight 
skewing effect towards the harder touch.
(from theory).
The touch point skips instantly on double touch.




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