Text7.12.rar

#include <osgUtil/Optimizer> #include <osgDB/ReadFile> #include <osgViewer/Viewer> #include <osgViewer/CompositeViewer> #include <osgGA/TerrainManipulator> #include <osgGA/StateSetManipulator> #include <osgGA/AnimationPathManipulator> #include <osgGA/TrackballManipulator> #include <osgGA/FlightManipulator> #include <osgGA/DriveManipulator> #include <osgGA/KeySwitchMatrixManipulator> #include <osgGA/StateSetManipulator> #include <osgGA/AnimationPathManipulator> #include <osgGA/TerrainManipulator> #include <osg/Material> #include <osg/Geode> #include <osg/BlendFunc> #include <osg/Depth> #include <osg/Projection> #include <osg/MatrixTransform> #include <osg/Camera> #include <osg/io_utils> #include <osg/ShapeDrawable> #include <osgText/Text> #include <sstream> // 处理拾取事件的类，继承自osgGA::GUIEventhandler 界面事件处理 class PickHandler : public osgGA::GUIEventHandler { public: //构造函数 PickHandler(osgText::Text* updateText): _updateText(updateText) {} //析构函数 ~PickHandler() {} //处理（事件接口、动作接口） bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa); //拾取（视图、事件接口） virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea); //设置显示内容 void setLabel(const std::string& name) { if (_updateText.get()) _updateText->setText(name); } protected: //传递一个文字对象 osg::ref_ptr<osgText::Text> _updateText; }; //事件处理（事件接口、动作接口） bool PickHandler::handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa) { switch(ea.getEventType()) { case(osgGA::GUIEventAdapter::PUSH): { //dynamic_cast运算符的作用是将&aa转换成osgViewer::View*类型的对象 osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa); if (view) pick(view,ea); return false; } case(osgGA::GUIEventAdapter::KEYDOWN): { if (ea.getKey()=='c') { osgViewer::View* view = dynamic_cast<osgViewer::View*>(&aa); //event也是一个指针，类型是osgGA::GUIEventAdapter osg::ref_ptr<osgGA::GUIEventAdapter> event = new osgGA::GUIEventAdapter(ea); event->setX((ea.getXmin()+ea.getXmax())*0.5); event->setY((ea.getYmin()+ea.getYmax())*0.5); if (view) pick(view,*event); } return false; } default: return false; } } //拾取（视图、事件接口）通过view计算交点 ，从事件接口ea中获得 x和y void PickHandler::pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea) { //创建一个线段交集检测对象 osgUtil::LineSegmentIntersector::Intersections intersections; std::string gdlist=""; //得到鼠标的位置 x和y float x = ea.getX(); float y = ea.getY(); //如果发生交集运算 （即鼠标点中了物体） if (view->computeIntersections(x,y,intersections)) { //得到相交交集的交点， hitr是一个迭代器 for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = intersections.begin(); hitr != intersections.end(); ++hitr) { std::ostringstream os;//申请一个流 if (!hitr->nodePath.empty() && !(hitr->nodePath.back()->getName().empty())) { // the geodes are identified by name. os<<"Object \""<<hitr->nodePath.back()->getName()<<"\""<<std::endl; } else if (hitr->drawable.valid()) { os<<"Object \""<<hitr->drawable->className()<<"\""<<std::endl; } //将局部坐标顶点和法线输入到os这个流里面。 os<<" local coords vertex("<< hitr->getLocalIntersectPoint()<<")"<<" normal("<<hitr->getLocalIntersectNormal()<<")"<<std::endl; os<<" world coords vertex("<< hitr->getWorldIntersectPoint()<<")"<<" normal("<<hitr->getWorldIntersectNormal()<<")"<<std::endl; //交点索引列表vil，交点存在hitr里面 const osgUtil::LineSegmentIntersector::Intersection::IndexList& vil = hitr->indexList; for(unsigned int i=0;i<vil.size();++i) { os<<" vertex indices ["<<i<<"] = "<<vil[i]<<std::endl; } //gdlist是一个字符串，用来存os中要显示的文字 gdlist += os.str(); } } //设置显示内容 setLabel(gdlist); } //创建HUD 参数是osgText。HUD也是作为场景中的一个节点存在 osg::Node* createHUD(osgText::Text* updateText) { // create the hud. derived from osgHud.cpp （derived：来源于） // adds a set of quads, each in a separate Geode - which can be picked individually // eg to be used as a menuing/help system! // Can pick texts too! osg::Camera* hudCamera = new osg::Camera;//创建一个相机 hudCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);//设置绝对帧引用 hudCamera->setProjectionMatrixAsOrtho2D(0,1280,0,1024);//设置正投影矩阵 hudCamera->setViewMatrix(osg::Matrix::identity());//设置视图矩阵 hudCamera->setRenderOrder(osg::Camera::POST_RENDER);//设置渲染顺序为POST hudCamera->setClearMask(GL_DEPTH_BUFFER_BIT);//清除深度缓存 //设置字体，声明一个timesFont，初始化为times.ttf std::string timesFont("fonts/times.ttf"); //关掉字体的光照、禁用深度缓存 来保证字体一直在最上面 osg::Vec3 position(150.0f,800.0f,0.0f);//设置位置 osg::Vec3 delta(0.0f,-60.0f,0.0f); { osg::Geode* geode = new osg::Geode();//也可以写成osg::ref_ptr<osg::Geode> geode = new osg::Geode();-------geode就是一个指针 osg::StateSet* stateset = geode->getOrCreateStateSet();//状态设置 stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF);//关闭光照 stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);//关闭深度缓存 geode->setName("simple");//设置这个geode的名字，geode是场景中的叶子节点 hudCamera->addChild(geode); osgText::Text* text = new osgText::Text; geode->addDrawable( text );//geode是osg场景中的叶子节点，然后就是让所有drawable的东西成组 text->setFont(timesFont);//设置字体 text->setText("Picking in Head Up Displays is simple!\nHow to do it?\nAm I on the first quard?");//设置内容 text->setPosition(position);//设置字体位置，用到上面申明的position position += delta; } for (int i=0; i<6; i++) { osg::Vec3 dy(0.0f,-30.0f,0.0f); osg::Vec3 dx(120.0f,0.0f,0.0f); osg::Geode* geode = new osg::Geode(); osg::StateSet* stateset = geode->getOrCreateStateSet(); const char *opts[]={"One", "Two", "Three", "January", "Feb", "2003"}; osg::Geometry *quad=new osg::Geometry;//申明一个指向几何体的指针 stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF); stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF); std::string name="subOption"; name += " "; name += std::string(opts[i]); geode->setName(name);//设置节点的名字 osg::Vec3Array* vertices = new osg::Vec3Array(4); // 1 quad，弄个3元数组指针，数组有4个元素，分别保存矩形的4个顶点 osg::Vec4Array* colors = new osg::Vec4Array;//4元数组指针 ，保存颜色 colors = new osg::Vec4Array; colors->push_back(osg::Vec4(0.8-0.1*i, 0.1*i, 0.2*i, 1.0));//通过i的变化来实现块的渐变颜色 quad->setColorArray(colors); quad->setColorBinding(osg::Geometry::BIND_PER_PRIMITIVE);//绑定颜色到方块上