/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

* 

* This program is distributed in the hope that it will be useful,

* but WITHOUT ANY WARRANTY; without even the implied warranty of

* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

* GNU Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with this program.  If not, 

* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".

*

* Description:  Gesture recognition utilities

*

*/

#include "qstmutils.h"

#include "qstmgesturedefs.h"

using namespace qstmUiEventEngine;

inline int QStm_Utils::longerEdge( const QSize& size )

{

	return MAX( size.height(), size.width() );

}

QRect QStm_Utils::toleranceRectMm( const QPoint& centerPoint, int size_mm )

{

	long toleranceLength = mm2Pixels(size_mm) / 2;

	return toleranceRectPx(centerPoint, toleranceLength);

}

QRect QStm_Utils::toleranceRectPx( const QPoint& centerPoint, int size_px )

{

	QRect toleranceRect( QPoint(0,0), QSize(size_px, size_px) );

	// grow by the tolerance length, while keeping the center point

	toleranceRect.moveCenter(centerPoint);

	return toleranceRect;

}

long QStm_Utils::mm2Pixels(long mm)

{

	//return Twips2Pixels(mm * KTwipsInMm);

	return mm * QApplication::desktop()->height() / QApplication::desktop()->heightMM();

}

long QStm_Utils::inches2Pixels(double inches)

	{

	//return Twips2Pixels(inches * KTwipsInInch);

	return inches * 25.4 * QApplication::desktop()->height() / QApplication::desktop()->heightMM();

	}

int QStm_Utils::distance(const QPoint& p1, const QPoint& p2)

{

/*

	double d = dx * dx + dy * dy;

	double dist ;

	Math::Sqrt(dist, d) ;

	return dist;

*/

	QPoint diff = p1 - p2;

	int x = diff.x();

	int y = diff.y();

	if(x<0) x=-x;

	if(y<0) y=-y;

	if(x < y) {

	  int t = x;

	  x = y;

	  y = t;        // ensures that x >= y

	}

	int dist = (y < ((13107 * x)>>15)) ?    // * (.4)

			  (x + ((y * 6310)>>15)) :      // * (.192582403)

			  (((x * 27926)>>15)            // * (.852245894)

				 + ((y * 18414)>>15));      // * (.561967668)

	return dist;

}

qreal QStm_Utils::distanceF(const QPoint& p1, const QPoint& p2)

{

	QPoint diff = p1 - p2;

	double dist;

	SQRT(dist, ((qreal)(diff.x() * diff.x() + diff.y() * diff.y()))) ;

	return dist;

}