UFOManipulator.h

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGGA_UFO_MANIPULATOR_DEF
#define OSGGA_UFO_MANIPULATOR_DEF 1

#include <iostream>

#include <osgGA/CameraManipulator>
#include <osg/Node>
#include <osg/Matrix>

namespace osgGA {

class OSGGA_EXPORT UFOManipulator : public osgGA::CameraManipulator
{

    public:
        UFOManipulator();

        virtual const char* className() const;

        virtual void setByMatrix( const osg::Matrixd &matrix ) ;

        virtual void setByInverseMatrix( const osg::Matrixd &invmat);

        virtual osg::Matrixd getMatrix() const;

        virtual osg::Matrixd getInverseMatrix() const ;

        virtual void setNode(osg::Node* node);

        virtual const osg::Node* getNode() const;

        virtual osg::Node* getNode();

        virtual void computeHomePosition();

        virtual void home(const osgGA::GUIEventAdapter&, osgGA::GUIActionAdapter&) ;
        void home(double);

        virtual void init(const GUIEventAdapter& ,GUIActionAdapter&);

        bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter &aa);

        void getUsage(osg::ApplicationUsage& usage) const;

        void getCurrentPositionAsLookAt( osg::Vec3d& eye, osg::Vec3d& center, osg::Vec3d& up );


        void setMinHeight( double in_min_height ) { _minHeightAboveGround = in_min_height; }
        double getMinHeight() const { return _minHeightAboveGround; }

        void setMinDistance( double in_min_dist ) { _minDistanceInFront = in_min_dist; }
        double getMinDistance() const { return _minDistanceInFront; }

        void setForwardSpeed( double in_fs ) { _forwardSpeed = in_fs; }
        double getForwardSpeed() const { return _forwardSpeed; }

        void setSideSpeed( double in_ss ) { _sideSpeed = in_ss; }
        double getSideSpeed() const { return _sideSpeed; }

        void setRotationSpeed( double in_rot_speed ) { _directionRotationRate = in_rot_speed; }
        double getRotationSpeed() const { return _directionRotationRate; }


    protected:

        virtual ~UFOManipulator();

        bool intersect(const osg::Vec3d& start, const osg::Vec3d& end, osg::Vec3d& intersection) const;

        osg::observer_ptr<osg::Node> _node;
        float       _viewAngle;
        osg::Matrixd _matrix;
        osg::Matrixd _inverseMatrix;
        osg::Matrixd _offset;

        double    _minHeightAboveGround;
        double    _minDistanceInFront;

        double    _speedEpsilon;
        double    _forwardSpeed;
        double    _sideSpeed;
        double    _upSpeed;
        double    _speedAccelerationFactor;
        double    _speedDecelerationFactor;

        bool      _decelerateUpSideRate;

        double    _directionRotationEpsilon;
        double    _directionRotationRate;
        double    _directionRotationAcceleration;
        double    _directionRotationDeceleration;

        double    _viewOffsetDelta;
        double    _pitchOffsetRate;
        double    _pitchOffset;
        double    _yawOffsetRate;
        double    _yawOffset;

        double    _t0;
        double    _dt;
        osg::Vec3d _direction;
        osg::Vec3d _position;


        bool _shift;
        bool _ctrl;
        bool _decelerateOffsetRate;

        bool _straightenOffset;

        void _stop();
        void _keyDown( const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &);
        void _keyUp( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter &);
        void _frame(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter &);

        void _adjustPosition();
};

}

#endif