VRS - The Virtual Rendering System

version 3.3

movefocusgroundplatenavigation.h

Go to the documentation of this file.

/******************************************************************************
* VRS - The Virtual Rendering System
* Copyright (C) 2000-2008 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: movefocusgroundplatenavigation.h 6426 2008-07-04 14:00:57Z Stefan_Maass $

#ifndef VRS_SG_MOVEFOCUSGROUNDPLATENAVIGATION_H
#define VRS_SG_MOVEFOCUSGROUNDPLATENAVIGATION_H

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

namespace VRS {

    class VRS_CORE_API MoveFocusGroundPlateNavigation : public GroundPlateNavigation {
             
    public:

        enum Mode { PRESERVE_POSITION, PRESERVE_ANGLE };

        MoveFocusGroundPlateNavigation(double yValOfGroundPlate = 0.0, Mode mode = PRESERVE_POSITION);        

        static const MouseButtonFunctionID MoveFocus;

                void setMode(Mode mode);
                Mode getMode() const;
        
        void setAnimationTime(double minSeconds = 0.25, double maxSeconds = 2.5);        
        double getMinAnimationTime() const;
        double getMaxAnimationTime() const;
                        
        virtual void onDragStart(int x, int y, SO<ButtonEvent>, MouseButtonFunctionID id);
        virtual void onTimer(SO<TimeEvent> event, double secondsSinceLastTimeEvent);
        
        VRS_TYPEINFO(MoveFocusGroundPlateNavigation, GroundPlateNavigation);

    private:
                static const double EPSILON;

                // 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);


        Vector oldFocus_; // these vector-variables are needed for PRESERVE_ANGLE only
        Vector newFocus_;
        Vector oldFrom_; 
        Vector newFrom_;
        double minAnimationTime_;
        double maxAnimationTime_;
        double animationTime_;
        double animationTimeElapsed_;
        bool animationActive_;                
        SO<DirectionInterpolator> interpol_;
        Mode mode_;
    };

} // namespace VRS

#endif // VRS_SG_MOVEFOCUSGROUNDPLATENAVIGATION_H

---

Generated on Wed May 23 06:00:13 2012 by Doxygen 1.5.6

© 2001-2010 Hasso-Plattner-Institut | Impressum | Contact