any touch screen experience there?

[John Macdonald]

On Wed, Feb 16, 2005 at 01:54:12PM -0500, William Park wrote:
> On Wed, Feb 16, 2005 at 01:20:57PM -0500, Zbigniew Koziol wrote:
> > Just wonder if there is anybody around who knows something how touch 
> > screens work under Linux?
> > 
> > The company I have some work with sells kiosks with touch screens. They 
> > operate on Windows. It would be wonderfull to change their OS to Linux, 
> > wouldnt it?
> > 
> > At the moment I do not know much technical details, but I will know 
> > more, soon.
> 
> Touch screen is very application dependent (because you need to
> interpret what x,y=20,30 means) and OS dependent (because of drivers).

While different in detail, touch screens are no more application
dependent than a mouse.

A touch (and release) is essentially the same as the mouse
action triple "move to x,y; press button 1; release button 1".

A touch and slide would insert a number of additional move
actions between the press and the release.

Windowing systems are intended to provide an abstract view
of control operations to the application, and to map use of
the available physical control devices onto the corresponding
abstract form for the application to apply.

That said, I've never used a touch screen in Linux.  However,
back in the days when the X Windowing System was at X10
rather than X11.* I recall reading about the input system
being intended to work generically for touch screens, mice,
drawing tablets, etc.

-- 
--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml