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