410 lines
10 KiB
C++
410 lines
10 KiB
C++
#include <osgGA/TrackballManipulator>
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#include <osg/Quat>
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#include <osg/Notify>
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using namespace osg;
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using namespace osgGA;
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TrackballManipulator::TrackballManipulator()
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{
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_modelScale = 0.01f;
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_minimumZoomScale = 0.05f;
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_thrown = false;
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_distance = 1.0f;
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}
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TrackballManipulator::~TrackballManipulator()
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{
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}
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void TrackballManipulator::setNode(osg::Node* node)
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{
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_node = node;
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if (_node.get())
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{
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const osg::BoundingSphere& boundingSphere=_node->getBound();
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_modelScale = boundingSphere._radius;
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}
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}
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const osg::Node* TrackballManipulator::getNode() const
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{
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return _node.get();
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}
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osg::Node* TrackballManipulator::getNode()
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{
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return _node.get();
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}
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/*ea*/
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void TrackballManipulator::home(const GUIEventAdapter& ,GUIActionAdapter& us)
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{
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if(_node.get())
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{
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const osg::BoundingSphere& boundingSphere=_node->getBound();
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computePosition(boundingSphere._center+osg::Vec3( 0.0,-3.5f * boundingSphere._radius,0.0f),
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boundingSphere._center,
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osg::Vec3(0.0f,0.0f,1.0f));
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us.requestRedraw();
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}
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}
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void TrackballManipulator::init(const GUIEventAdapter& ,GUIActionAdapter& )
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{
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flushMouseEventStack();
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}
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void TrackballManipulator::getUsage(osg::ApplicationUsage& usage) const
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{
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usage.addKeyboardMouseBinding("Trackball: Space","Reset the viewing position to home");
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usage.addKeyboardMouseBinding("Trackball: +","When in stereo, increase the fusion distance");
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usage.addKeyboardMouseBinding("Trackball: -","When in stereo, reduse the fusion distance");
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}
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bool TrackballManipulator::handle(const GUIEventAdapter& ea,GUIActionAdapter& us)
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{
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switch(ea.getEventType())
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{
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case(GUIEventAdapter::PUSH):
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{
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flushMouseEventStack();
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addMouseEvent(ea);
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if (calcMovement()) us.requestRedraw();
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us.requestContinuousUpdate(false);
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_thrown = false;
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return true;
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}
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case(GUIEventAdapter::RELEASE):
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{
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if (ea.getButtonMask()==0)
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{
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if (isMouseMoving())
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{
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if (calcMovement())
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{
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us.requestRedraw();
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us.requestContinuousUpdate(true);
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_thrown = true;
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}
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}
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else
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{
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flushMouseEventStack();
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addMouseEvent(ea);
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if (calcMovement()) us.requestRedraw();
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us.requestContinuousUpdate(false);
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_thrown = false;
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}
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}
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else
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{
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flushMouseEventStack();
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addMouseEvent(ea);
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if (calcMovement()) us.requestRedraw();
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us.requestContinuousUpdate(false);
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_thrown = false;
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}
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return true;
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}
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case(GUIEventAdapter::DRAG):
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{
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addMouseEvent(ea);
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if (calcMovement()) us.requestRedraw();
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us.requestContinuousUpdate(false);
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_thrown = false;
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return true;
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}
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case(GUIEventAdapter::MOVE):
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{
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return false;
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}
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case(GUIEventAdapter::KEYDOWN):
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if (ea.getKey()==' ')
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{
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flushMouseEventStack();
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_thrown = false;
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home(ea,us);
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us.requestRedraw();
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us.requestContinuousUpdate(false);
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return true;
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}
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return false;
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case(GUIEventAdapter::FRAME):
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if (_thrown)
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{
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if (calcMovement()) us.requestRedraw();
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}
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return false;
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default:
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return false;
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}
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}
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bool TrackballManipulator::isMouseMoving()
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{
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if (_ga_t0.get()==NULL || _ga_t1.get()==NULL) return false;
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static const float velocity = 0.1f;
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float dx = _ga_t0->getXnormalized()-_ga_t1->getXnormalized();
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float dy = _ga_t0->getYnormalized()-_ga_t1->getYnormalized();
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float len = sqrtf(dx*dx+dy*dy);
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float dt = _ga_t0->time()-_ga_t1->time();
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return (len>dt*velocity);
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}
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void TrackballManipulator::flushMouseEventStack()
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{
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_ga_t1 = NULL;
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_ga_t0 = NULL;
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}
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void TrackballManipulator::addMouseEvent(const GUIEventAdapter& ea)
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{
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_ga_t1 = _ga_t0;
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_ga_t0 = &ea;
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}
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void TrackballManipulator::setByMatrix(const osg::Matrixd& matrix)
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{
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_center = osg::Vec3(0.0f,0.0f,-_distance)*matrix;
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matrix.get(_rotation);
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}
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osg::Matrixd TrackballManipulator::getMatrix() const
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{
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return osg::Matrixd::translate(0.0,0.0,_distance)*osg::Matrixd::rotate(_rotation)*osg::Matrixd::translate(_center);
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}
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osg::Matrixd TrackballManipulator::getInverseMatrix() const
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{
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return osg::Matrixd::translate(-_center)*osg::Matrixd::rotate(_rotation.inverse())*osg::Matrixd::translate(0.0,0.0,-_distance);
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}
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void TrackballManipulator::computePosition(const osg::Vec3& eye,const osg::Vec3& center,const osg::Vec3& up)
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{
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osg::Vec3 lv(center-eye);
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osg::Vec3 f(lv);
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f.normalize();
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osg::Vec3 s(f^up);
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s.normalize();
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osg::Vec3 u(s^f);
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u.normalize();
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osg::Matrix rotation_matrix(s[0], u[0], -f[0], 0.0f,
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s[1], u[1], -f[1], 0.0f,
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s[2], u[2], -f[2], 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f);
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_center = center;
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_distance = lv.length();
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rotation_matrix.get(_rotation);
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_rotation = _rotation.inverse();
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}
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bool TrackballManipulator::calcMovement()
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{
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// return if less then two events have been added.
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if (_ga_t0.get()==NULL || _ga_t1.get()==NULL) return false;
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float dx = _ga_t0->getXnormalized()-_ga_t1->getXnormalized();
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float dy = _ga_t0->getYnormalized()-_ga_t1->getYnormalized();
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// return if there is no movement.
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if (dx==0 && dy==0) return false;
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unsigned int buttonMask = _ga_t1->getButtonMask();
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if (buttonMask==GUIEventAdapter::LEFT_MOUSE_BUTTON)
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{
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// rotate camera.
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osg::Vec3 axis;
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float angle;
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float px0 = _ga_t0->getXnormalized();
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float py0 = _ga_t0->getYnormalized();
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float px1 = _ga_t1->getXnormalized();
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float py1 = _ga_t1->getYnormalized();
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trackball(axis,angle,px1,py1,px0,py0);
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osg::Quat new_rotate;
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new_rotate.makeRotate(angle,axis);
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_rotation = _rotation*new_rotate;
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return true;
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}
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else if (buttonMask==GUIEventAdapter::MIDDLE_MOUSE_BUTTON ||
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buttonMask==(GUIEventAdapter::LEFT_MOUSE_BUTTON|GUIEventAdapter::RIGHT_MOUSE_BUTTON))
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{
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// pan model.
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float scale = -0.5f*_distance;
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osg::Matrix rotation_matrix;
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rotation_matrix.set(_rotation);
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osg::Vec3 dv(dx*scale,dy*scale,0.0f);
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_center += dv*rotation_matrix;
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return true;
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}
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else if (buttonMask==GUIEventAdapter::RIGHT_MOUSE_BUTTON)
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{
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// zoom model.
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float fd = _distance;
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float scale = 1.0f+dy;
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if (fd*scale>_modelScale*_minimumZoomScale)
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{
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_distance *= scale;
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}
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else
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{
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// notify(DEBUG_INFO) << "Pushing forward"<<std::endl;
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// push the camera forward.
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float scale = -fd;
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osg::Matrix rotation_matrix(_rotation);
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osg::Vec3 dv = (osg::Vec3(0.0f,0.0f,-1.0f)*rotation_matrix)*(dy*scale);
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_center += dv;
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}
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return true;
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}
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return false;
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}
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/*
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* This size should really be based on the distance from the center of
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* rotation to the point on the object underneath the mouse. That
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* point would then track the mouse as closely as possible. This is a
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* simple example, though, so that is left as an Exercise for the
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* Programmer.
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*/
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const float TRACKBALLSIZE = 0.8f;
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/*
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* Ok, simulate a track-ball. Project the points onto the virtual
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* trackball, then figure out the axis of rotation, which is the cross
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* product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
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* Note: This is a deformed trackball-- is a trackball in the center,
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* but is deformed into a hyperbolic sheet of rotation away from the
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* center. This particular function was chosen after trying out
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* several variations.
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*
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* It is assumed that the arguments to this routine are in the range
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* (-1.0 ... 1.0)
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*/
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void TrackballManipulator::trackball(osg::Vec3& axis,float& angle, float p1x, float p1y, float p2x, float p2y)
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{
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/*
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* First, figure out z-coordinates for projection of P1 and P2 to
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* deformed sphere
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*/
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osg::Matrix rotation_matrix(_rotation);
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osg::Vec3 uv = osg::Vec3(0.0f,1.0f,0.0f)*rotation_matrix;
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osg::Vec3 sv = osg::Vec3(1.0f,0.0f,0.0f)*rotation_matrix;
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osg::Vec3 lv = osg::Vec3(0.0f,0.0f,-1.0f)*rotation_matrix;
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osg::Vec3 p1 = sv*p1x+uv*p1y-lv*tb_project_to_sphere(TRACKBALLSIZE,p1x,p1y);
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osg::Vec3 p2 = sv*p2x+uv*p2y-lv*tb_project_to_sphere(TRACKBALLSIZE,p2x,p2y);
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/*
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* Now, we want the cross product of P1 and P2
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*/
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// Robert,
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//
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// This was the quick 'n' dirty fix to get the trackball doing the right
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// thing after fixing the Quat rotations to be right-handed. You may want
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// to do something more elegant.
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// axis = p1^p2;
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axis = p2^p1;
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axis.normalize();
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/*
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* Figure out how much to rotate around that axis.
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*/
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float t = (p2-p1).length() / (2.0*TRACKBALLSIZE);
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/*
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* Avoid problems with out-of-control values...
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*/
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if (t > 1.0) t = 1.0;
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if (t < -1.0) t = -1.0;
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angle = inRadians(asin(t));
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}
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/*
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* Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
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* if we are away from the center of the sphere.
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*/
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float TrackballManipulator::tb_project_to_sphere(float r, float x, float y)
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{
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float d, t, z;
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d = sqrt(x*x + y*y);
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/* Inside sphere */
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if (d < r * 0.70710678118654752440)
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{
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z = sqrt(r*r - d*d);
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} /* On hyperbola */
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else
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{
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t = r / 1.41421356237309504880;
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z = t*t / d;
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}
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return z;
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}
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