Problem with QT embedded and touchscreen calibration.

[webquinty]

Hello,

After look for a lot of information in the net, now my touchscreen works properly with QT, but now I have tried to calibrate it and I can not do it.

There is a function called "Calibrate::sanityCheck()" that return me all time false but I do not understand why is the reason.

This is the source code:

bool Calibrate::sanityCheck()
{
#ifdef QWS
	QPoint tl = cd.devPoints[QWSPointerCalibrationData::TopLeft];
	QPoint tr = cd.devPoints[QWSPointerCalibrationData::TopRight];
	QPoint bl = cd.devPoints[QWSPointerCalibrationData::BottomLeft];
	QPoint br = cd.devPoints[QWSPointerCalibrationData::BottomRight];
 
	// not needed anywhere .. just calculate it, so it's there
	cd. devPoints [QWSPointerCalibrationData::Center] = QRect ( tl, br ). normalize ( ). center ( );
 
	int dlx = QABS( bl. x ( ) - tl. x ( ));
	int dly = QABS( bl. y ( ) - tl. y ( ));
	int drx = QABS( br. x ( ) - tr. x ( ));
	int dry = QABS( br. y ( ) - tr. y ( ));
	int dtx = QABS( tr. x ( ) - tl. x ( ));
	int dty = QABS( tr. y ( ) - tl. y ( ));
	int dbx = QABS( br. x ( ) - bl. x ( ));
	int dby = QABS( br. y ( ) - bl. y ( ));
 
	int dl = (int) ::sqrt (( dlx * dlx ) + ( dly * dly )); // calculate vector lengths for all sides
	int dr = (int) ::sqrt (( drx * drx ) + ( dry * dry ));
	int dt = (int) ::sqrt (( dtx * dtx ) + ( dty * dty ));
	int db = (int) ::sqrt (( dbx * dbx ) + ( dby * dby ));
 
	// Calculate leeway for x/y (we do not care if diff1/diff2 is for x or y here !)
	int diff1 = QABS( dl - dr );
	int avg1  = ( dl + dr ) / 2;
	int diff2 = QABS( dt - db );
	int avg2 = ( dt + db ) / 2;
 
	// Calculate leeway for "real" vector length against "manhattan" vector length
	// This is a check, if the rect is rotated (other then 0/90/180/270)
	// It needs to be performed only for the triange (bl, tl, tr)
	int diff3 = QABS(( dlx + dly + dtx + dty ) - ( dl + dt ));
	int avg3 = (( dlx + dly + dtx + dty ) + ( dl + dt )) / 2;
 
	if (( diff1 > ( avg1 / 20 )) || // 5% leeway
	    ( diff2 > ( avg2 / 20 )) ||
	    ( diff3 > ( avg3 / 20 )))
		return false;
	else
		return true;
#else
return true;
#endif
}

bool Calibrate::sanityCheck()
{
#ifdef QWS
	QPoint tl = cd.devPoints[QWSPointerCalibrationData::TopLeft];
	QPoint tr = cd.devPoints[QWSPointerCalibrationData::TopRight];
	QPoint bl = cd.devPoints[QWSPointerCalibrationData::BottomLeft];
	QPoint br = cd.devPoints[QWSPointerCalibrationData::BottomRight];

	// not needed anywhere .. just calculate it, so it's there
	cd. devPoints [QWSPointerCalibrationData::Center] = QRect ( tl, br ). normalize ( ). center ( );

	int dlx = QABS( bl. x ( ) - tl. x ( ));
	int dly = QABS( bl. y ( ) - tl. y ( ));
	int drx = QABS( br. x ( ) - tr. x ( ));
	int dry = QABS( br. y ( ) - tr. y ( ));
	int dtx = QABS( tr. x ( ) - tl. x ( ));
	int dty = QABS( tr. y ( ) - tl. y ( ));
	int dbx = QABS( br. x ( ) - bl. x ( ));
	int dby = QABS( br. y ( ) - bl. y ( ));

	int dl = (int) ::sqrt (( dlx * dlx ) + ( dly * dly )); // calculate vector lengths for all sides
	int dr = (int) ::sqrt (( drx * drx ) + ( dry * dry ));
	int dt = (int) ::sqrt (( dtx * dtx ) + ( dty * dty ));
	int db = (int) ::sqrt (( dbx * dbx ) + ( dby * dby ));

	// Calculate leeway for x/y (we do not care if diff1/diff2 is for x or y here !)
	int diff1 = QABS( dl - dr );
	int avg1  = ( dl + dr ) / 2;
	int diff2 = QABS( dt - db );
	int avg2 = ( dt + db ) / 2;

	// Calculate leeway for "real" vector length against "manhattan" vector length
	// This is a check, if the rect is rotated (other then 0/90/180/270)
	// It needs to be performed only for the triange (bl, tl, tr)
	int diff3 = QABS(( dlx + dly + dtx + dty ) - ( dl + dt ));
	int avg3 = (( dlx + dly + dtx + dty ) + ( dl + dt )) / 2;

	if (( diff1 > ( avg1 / 20 )) || // 5% leeway
	    ( diff2 > ( avg2 / 20 )) ||
	    ( diff3 > ( avg3 / 20 )))
		return false;
	else
		return true;
#else
return true;
#endif
}

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Values of diff1, avg1, diff2, avg2, diff3, avg3:

diff1 = 5
avg1 = 591 -->> diff1 > avg1/20 -- 5 > 29

diff2 = 11
avg2 = 386 -->> diff2 > avg2/20 -- 11 > 19

diff3 = 364
avg3 = 1168 -->> diff3 > avg3/20 -- 364 > 58

Then, my problem is diff3 and avg3.

Any advice??
Best regards.