131 lines
4.9 KiB
C++
131 lines
4.9 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGGA_TRACKBALLMANIPULATOR
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#define OSGGA_TRACKBALLMANIPULATOR 1
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#include <osgGA/MatrixManipulator>
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#include <osg/Quat>
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namespace osgGA{
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class OSGGA_EXPORT TrackballManipulator : public MatrixManipulator
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{
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public:
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TrackballManipulator();
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virtual const char* className() const { return "Trackball"; }
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/** set the minimum distance (as ratio) the eye point can be zoomed in towards the
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center before the center is pushed forward.*/
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void setMinimumZoomScale(float minimumZoomScale) { _minimumZoomScale=minimumZoomScale; }
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/** get the minimum distance (as ratio) the eye point can be zoomed in */
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float getMinimumZoomScale() const { return _minimumZoomScale; }
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/** set the position of the matrix manipulator using a 4x4 Matrix.*/
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virtual void setByMatrix(const osg::Matrixd& matrix);
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/** set the position of the matrix manipulator using a 4x4 Matrix.*/
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virtual void setByInverseMatrix(const osg::Matrixd& matrix) { setByMatrix(osg::Matrixd::inverse(matrix)); }
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/** get the position of the manipulator as 4x4 Matrix.*/
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virtual osg::Matrixd getMatrix() const;
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/** get the position of the manipulator as a inverse matrix of the manipulator, typically used as a model view matrix.*/
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virtual osg::Matrixd getInverseMatrix() const;
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/** Get the FusionDistanceMode. Used by SceneView for setting up setereo convergence.*/
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virtual osgUtil::SceneView::FusionDistanceMode getFusionDistanceMode() const { return osgUtil::SceneView::USE_FUSION_DISTANCE_VALUE; }
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/** Get the FusionDistanceValue. Used by SceneView for setting up setereo convergence.*/
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virtual float getFusionDistanceValue() const { return _distance; }
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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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/** Get the keyboard and mouse usage of this manipulator.*/
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virtual void getUsage(osg::ApplicationUsage& usage) const;
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/** Set the size of the trackball. */
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void setTrackballSize(float size);
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/** Get the size of the trackball. */
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float getTrackballSize() const { return _trackballSize; }
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protected:
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virtual ~TrackballManipulator();
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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 computePosition(const osg::Vec3& eye,const osg::Vec3& lv,const osg::Vec3& up);
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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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double _modelScale;
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double _minimumZoomScale;
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bool _thrown;
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osg::Vec3d _center;
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osg::Quat _rotation;
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double _distance;
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float _trackballSize;
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};
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}
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#endif
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