Trackball rotate的OSG实现（二）（不是manipulator那种~是动物体那种！）

来源：互联网发布：淘宝修图兼职编辑：程序博客网时间：2024/05/16 18:38

接上篇，这是篇水数量的博客。

bool TrackballRotate::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa){viewer = dynamic_cast<osgViewer::Viewer*>(&aa);if (!viewer) return false;switch (ea.getEventType()){case osgGA::GUIEventAdapter::PUSH:{int button = ea.getButton();if (button == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON){lbuttonDown = true;pick(ea.getX(), ea.getY());if (PickObject){old_world_point = screen2World(ea.getX(), ea.getY());//old_world_point = { ea.getX(), ea.getY() ,0};std::cout << "old_world_point.x(): " << old_world_point.x() << " old_world_point.y(): " << old_world_point.z() << std::endl;center = picked->getBound().center();std::cout << "center: " << center.x() << " " << center.y() << " " << center.z() << std::endl;originPos = picked->getMatrix();sphere_radius = picked->getBound().radius();std::cout << "sphere_radius: " << sphere_radius << std::endl;std::cout << "radius" << sphere_radius << std::endl;}}else{lbuttonDown = false;}return false;}case  osgGA::GUIEventAdapter::DRAG:{if (PickObject&&lbuttonDown){osg::Vec3 new_world_point = screen2World(ea.getX(), ea.getY());//osg::Vec3 new_world_point = { ea.getX(), ea.getY(), 0 };std::cout << "new_world_point.x(): " << new_world_point.x() << " new_world_point.y(): " << new_world_point.z() << std::endl;osg::Quat rotateParameter = GetRotateParameter(new_world_point, old_world_point);std::cout << "rotateParameter: " << rotateParameter.x() <<" "<< rotateParameter.y()<<" " << rotateParameter.z() << std::endl;picked->setMatrix(originPos*osg::Matrix::translate(-center)*osg::Matrix::rotate(rotateParameter)*osg::Matrix::translate(center));originPos = picked->getMatrix();center=picked->getBound().center();old_world_point = new_world_point;}return false;}case osgGA::GUIEventAdapter::RELEASE:{PickObject = false;lbuttonDown = false;return false;}default:return false;}}

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