Following is my touchscreen calibration information. The bottom right
point has a big Y value, so the four points construct a trapezium. After
calibration,  the touchscreen still isn't accurate. If I draw a square
with the draw function of ts_test, it will give me a trapezium. 

Is it because there is some problems with my touchscreen ? or because
the calibration algorithm is imperfect ?

Thanks
Stanley.


[EMAIL PROTECTED]:/root> ts_calibrate 
xres = 240, yres = 320
Took 33 samples...
Top left : X = 2492 Y =  122
Took 26 samples...
Top right : X = 2221 Y =  336
Took 26 samples...
Bot right : X = 2728 Y =  740
Took 27 samples...
Bot left : X = 2789 Y =  235
Took 22 samples...
Center : X = 2568 Y =  335
532.714355 -0.200746 0.285931
-908.327820 0.396201 0.153282
Calibration constants: 34911968 -13156 18738 -59528172 25965 10045
65536 

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