VRS - The Virtual Rendering System

version 3.3

zoomgroundplatenavigation.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: zoomgroundplatenavigation.h 6426 2008-07-04 14:00:57Z Stefan_Maass $

#ifndef VRS_SG_ZOOMGROUNDPLATENAVIGATION_H
#define VRS_SG_ZOOMGROUNDPLATENAVIGATION_H

#include <vrs/sg/groundplatenavigation.h>

namespace VRS {
    
    class VRS_CORE_API ZoomGroundPlateNavigation : public GroundPlateNavigation {                          
    public:

        ZoomGroundPlateNavigation(double yValOfGroundPlate = 0.0);
        
        static const MouseButtonFunctionID Zoom;
        
        void setWheelZoomFactor(double factor = 0.8);
        
        double getWheelZoomFactor() const;
        
        void setDragZoomFactor(double factor = 0.5);
        
        double getDragZoomFactor() const;
        
        void setMinDistance(double distance = 0.001);
        
        double getMinDistance() const;
        
        void setMaxDistance(double distance = 0.0);
        
        double getMaxDistance() const;
        

        virtual void onDragMotion(
            int x, int y, 
            SO<MotionEvent>, 
            MouseButtonFunctionID id,         
            int startX, int startY);

        virtual void onDragEnd(
            int x, int y, 
            SO<ButtonEvent>, 
            MouseButtonFunctionID id,        
            int startX, int startY);

        virtual void onWheelEvent(SO<WheelEvent> we);
                
        VRS_TYPEINFO(ZoomGroundPlateNavigation, GroundPlateNavigation);

    protected:
                static const double EPSILON;

                // performs the zoom
        virtual void zoom(double factor, SO<Canvas> canvas);

                // Shots a ray through the middle of the screen. It returns true if a focus point has been found.
                // In this case 'newFocus' contains the new focus point:
                // - 'newFocus' is the nearest intersection point in front of the camera or
                // - 'newFocus' is another intersection points, that equals the old focus
                bool updateFocus(const Vector& from, const Vector& to, SO<Canvas> canvas,
                        Vector& newFocus);

                // Checks if the current view direction leads to a valid focus
        void updateFocus(SO<Canvas> canvas);

        bool focusValid_; // Indicates the validity of lastFocus_
        Vector lastFocus_; 
        double wheelZoomFactor_;
        double dragZoomFactor_;
        double minDistance_;        
        double maxDistance_;        
    };

} // namespace VRS

#endif // VRS_SG_ZOOMGROUNDPLATENAVIGATION_H

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