//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield //Distributed under the terms of the GNU Library General Public License (LGPL) //as published by the Free Software Foundation. #ifndef OSGGA_TRACKBALLMANIPULATOR #define OSGGA_TRACKBALLMANIPULATOR 1 #include namespace osgGA{ class OSGGA_EXPORT TrackballManipulator : public CameraManipulator { public: TrackballManipulator(); virtual ~TrackballManipulator(); /** Attach a node to the manipulator. Automatically detaches previously attached node. setNode(NULL) detaches previously nodes. Is ignored by manipulators which do not require a reference model.*/ virtual void setNode(osg::Node*); /** Return node if attached.*/ virtual const osg::Node* getNode() const; /** Return node if attached.*/ virtual osg::Node* getNode(); /** Move the camera to the default position. May be ignored by manipulators if home functionality is not appropriate.*/ virtual void home(const GUIEventAdapter& ea,GUIActionAdapter& us); /** Start/restart the manipulator.*/ virtual void init(const GUIEventAdapter& ea,GUIActionAdapter& us); /** handle events, return true if handled, false otherwise.*/ virtual bool handle(const GUIEventAdapter& ea,GUIActionAdapter& us); protected: /** Reset the internal GUIEvent stack.*/ void flushMouseEventStack(); /** Add the current mouse GUIEvent to internal stack.*/ void addMouseEvent(const GUIEventAdapter& ea); void computeLocalDataFromCamera(); void computeCameraFromLocalData(); /** For the give mouse movement calculate the movement of the camera. Return true is camera has moved and a redraw is required.*/ bool calcMovement(); void trackball(osg::Vec3& axis,float& angle, float p1x, float p1y, float p2x, float p2y); float tb_project_to_sphere(float r, float x, float y); /** Check the speed at which the mouse is moving. If speed is below a threshold then return false, otherwise return true.*/ bool isMouseMoving(); // Internal event stack comprising last three mouse events. osg::ref_ptr _ga_t1; osg::ref_ptr _ga_t0; osg::ref_ptr _node; float _modelScale; float _minimumZoomScale; bool _thrown; osg::Vec3 _center; osg::Quat _rotation; float _distance; }; } #endif