eGalax touchscreen calibration

[bboyandru]

(9th Jul, 2013 09:31 PM)Markamc Wrote:  Hi Andrei,

Nice one, I'll try it later.

How do you do the calibration, is it using a program?
It would be possible to script and inject gestures too in python at the event level, although I don't intend on doing it! (need life back!)

The reason I tried a different way was the click_confines was to small for my finger size on a 7" screen, can you change this externally, say in the calib file so I could alter the sensitivity of a touch? Saves me recompiling.

Brantje, I'm sure the calibration should'nt be off, I think the clue was the resolution of your pi, xres 1240. The 'lag' I noticed was probably due to the python error

Hi Mark!

I did my calibration in Xserver using xinput_calibrator program(you can see how I did this on my blog post at the calibration part). I am sure that this can be done as well with ts_calibrate. If you want to disable my calibration you just have to put the values from the calibration file like this:
calib_x_d=<your screen resolution width> e.g. calib_x_d=1280
calib_y_d=<your screen resolution height> e.g. calib_y_d=720
calib_x_fact=-1
calib_y_fact=-1
My projection is like this:
pointer.x = screen_width - value_read.x * calib_x_fact - calib_x_d;
pointer.y = screen_height - value_read.y * calib_y_fact - calib_y_d;
and the original code is like this:
pointer.x = value_read.x;
pointer.y = value_read.y;
I will modify the patches and add click_confines value to the calibration file this evening.

Andrei