nanogui: Thread: Configuring for Touch Screens.

I am trying to understand the interface between Microwindows and a TS
driver.

I see that Microwindows polls the TS. The poll routine returns 0 if
there has not been an event. Otherwise, it returns a value indicating an
event has occured.

If an event has occured it then reads the device. I assume what is
returned is an X, Y and pressure measurement. Is that a raw or a
calibrated measurement? What is the format of the data?

Scott

: I am trying to understand the interface between Microwindows and a TS
: driver.

Microwindows abstracts a touch screen driver to look exactly
like mouse input.  That is, it returns an x, y position, as well
as button information.  The x,y information can either be
relative or absolute, depending on the return value from
the Microwindows driver.




: 
: If an event has occured it then reads the device. I assume what is
: returned is an X, Y and pressure measurement. Is that a raw or a
: calibrated measurement? What is the format of the data?

The format of the data is completely up to the kernel touchscreen
driver, of which there is no Linux standard.  Also, there is
no standard for calibration.  There is a contributed calibration
program (written in microwindows win32) in microwin/src/contrib/GPL/tpcal.

Regards,

Greg


: 
: Scott
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