Input Method - Missing Buttongrip

Werner Almesberger werner at openmoko.org
Mon May 7 10:12:06 CEST 2007


Andreas Kostyrka wrote:
> AFAIK, if you put 2 fingers to the display, it
> reports the weighted middle point of these to the software.

Unfortunately, the story is a bit more complicated. The actual value
depends on the respective pressure at the two points. If you touch
the touch screen very lightly at point A, and rap hard at point B,
the value will be close to B. If you apply roughly the same
pressure at both points, it will be indeed roughly in the middle.

Also, as pressure changes, the coordinates change.

So this means that you could probably do something useful with
two finger input with the current hardware, as long as you can make
sure that one finger is placed before the other, but you'd have to
do some research into interpreting the data you get.

- Werner

-- 
  _________________________________________________________________________
 / Werner Almesberger, Buenos Aires, Argentina     werner at almesberger.net /
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