VRS - The Virtual Rendering System

version 3.3

pangroundplatenavigation.h

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/******************************************************************************
* VRS - The Virtual Rendering System
* Copyright (C) 2000-2006 Computer Graphics Systems Group at the 
* Hasso-Plattner-Institute (HPI), Potsdam, Germany.
*
* This  library  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;  either  version 2.1 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 Lesser General Public License for more details. You should have received
* a copy of the GNU Lesser+ General Public License along with this library; if
* not, write to the FreeSoftware Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA, 02111-1307, USA.
******************************************************************************/

// $Id$
//
// $Log$
//

#ifndef VRS_SG_PANGROUNDPLATENAVIGATION_H
#define VRS_SG_PANGROUNDPLATENAVIGATION_H

#include <vrs/config.h>
#include <vrs/sg/groundplatenavigation.h>

namespace VRS {

        class VRS_CORE_API PanGroundPlateNavigation :
        public VRS::GroundPlateNavigation
    {
    public:
        VRS_TYPEINFO(PanGroundPlateNavigation, VRS::GroundPlateNavigation);
                
        PanGroundPlateNavigation();        

        static const MouseButtonFunctionID Panning;
                                
        virtual void onDragStart(int x, int y, SO<VRS::ButtonEvent>, MouseButtonFunctionID id);
        virtual void onDragMotion(
            int x, int y, 
            SO<VRS::MotionEvent>, 
            MouseButtonFunctionID id,         
            int startX, int startY
        );

        void setMinDragAngle(double degrees = 10.0);
        double getMinDragAngle() const;

                virtual bool preservingViewDirectionRequired() const;

    private:
        void findDragPoint(SO<VRS::Canvas> canvas, int x, int y);
        VRS::Vector dragPoint_; 
        bool dragPointValid_;    
        double minDragAngle_; // in degrees
    }; // class PanGroundPlateNavigation

} // namespace VRS

#endif // VRS_SG_PANGROUNDPLATENAVIGATION_H

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