/*

    Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Library General Public

    License as published by the Free Software Foundation; either

    version 2 of the License, or (at your option) any later version.

    This library 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

    Library General Public License for more details.

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

    along with this library; see the file COPYING.LIB.  If not, write to

    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

    Boston, MA 02110-1301, USA.

*/

#ifndef TouchGestureHandler_h

#define TouchGestureHandler_h

#include "PlatformTouchEvent.h"

namespace WebCore {

class TouchGestureHandler {

public:

    TouchGestureHandler();

    void reset();

    void updateTouchPoints(const Vector<const PlatformTouchPoint*>& touchPoints);

    int translateX() const { return m_translate.x(); }

    int translateY() const { return m_translate.y(); }

    const IntPoint& pos() const { return m_pos; }

    const IntPoint& screenPos() const { return m_screenPos; }

    float scale() const { return m_scale; }

    float rotate() const { return m_rotate; }

private:

    float calcAngle(const IntPoint& p1, const IntPoint& p2) const;

    float diffAngle(float alpha, float beta) const;

    IntPoint calcPos(const Vector<const PlatformTouchPoint*>& touchPoints) const;

    float calcDistance(const IntPoint& p1, const IntPoint& p2) const;

    void updateRefreshNeededState(const Vector<const PlatformTouchPoint*>& touchPoints);

    bool m_refreshNeeded;

    IntPoint m_translate;

    float m_scale;

    float m_rotate;

    IntPoint m_pos;

    IntPoint m_screenPos;

    float m_prevAngle;

    int m_prevSize;

    int m_prevIds[2];

    float m_prevDistance;

};

}

#endif // TouchGestureHandler_h