Fwd: UI long term development perspective: physics engine

Florent THIERY fthiery at gmail.com
Mon Apr 2 01:38:30 CEST 2007

> > 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...., ...).
> 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.

Thank you. I added your report to the wiki, and reorganized the mails
so that a human being can try to contribute :p

Please take a look if interested to help.

If you have some spare time to continue reporting about the
touchscreen, there are some questions on the wiki, but anybody having
access to hardware can do it.

Why do i keep asking for this? Because i'm not sure apple's ibooks
have multi-touch pads, but if you slide 2 fingers in parallel, it
makes scrolling. Which means: if it's not multitouch at it's base
(and, if it was, there would be more of it), then they detect it using
a hack. So can we do too, but we have to know exactly how the
touchscreen reports "exotic" uses.



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