osgEarth例子

#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/StateSetManipulator>
#include <osgGA/TrackballManipulator>
#include <osgEarth/Map>
#include <osgEarth/MapNode>
#include <osgEarthDrivers/tms/TMSOptions>
#include <osgEarthDrivers/model_feature_geom/FeatureGeomModelOptions>
#include <osgEarthDrivers/feature_ogr/OGRFeatureOptions>
#include <osgEarthDrivers/cache_filesystem/FileSystemCache>
#include <osgEarthUtil/EarthManipulator>
#include <osgEarthUtil/GeodeticGraticule>
#include <osgEarthUtil/LatLongFormatter>
#include <osgEarthUtil/Controls>
#include <osgEarthUtil/MouseCoordsTool>
#include <osgEarthUtil/AutoClipPlaneHandler>
#include <osg/PositionAttitudeTransform>
#include <osg/Group>
#include <osg/Node>
#include <osgDB/ReadFile>
//初始化影像、地形
void initImageAndElevation(osgEarth::Map* map)
{
 //影像
 osgEarth::Drivers::TMSOptions imgOption;
 imgOption.url()="D:/CacheData/OUTDATA/JiLinImage/tms.xml";
 //imgOption.url()="http://readymap.org/readymap/tiles/1.0.0/7/";
 map->addImageLayer( new osgEarth::ImageLayer( "image", imgOption ) );
 //高程
 osgEarth::Drivers::TMSOptions elvOption;
 elvOption.url()="D:/CacheData/OUTDATA/JiLinElevation/tms.xml";
 //elvOption.url()="http://readymap.org/readymap/tiles/1.0.0/9/";
 map->addElevationLayer( new osgEarth::ElevationLayer( "elevation", elvOption ) );
}
//初始化省界国界
void initBoundaries(osgEarth::Map* map)
{
 osgEarth::Drivers::FeatureGeomModelOptions worldBoundaries;
 osgEarth::Drivers::OGRFeatureOptions ogrOptions;
 ogrOptions.url()="world.shp";
 worldBoundaries.compilerOptions()=ogrOptions;
 //worldBoundaries.styles().
 map->addModelLayer(new osgEarth::ModelLayer("world", worldBoundaries));
}
//初始化事件处理器
void initEventHandler(osgViewer::Viewer* viewer,osgEarth::MapNode* mapNode)
{
 //鼠标位置信息显示
 osgEarth::Util::Formatter* formatter = new osgEarth::Util::LatLongFormatter();
 osgEarth::Util::LabelControl* readout = new osgEarth::Util::LabelControl();
 osgEarth::Util::ControlCanvas::get( viewer, true )->addControl( readout );
 osgEarth::Util::MouseCoordsTool* tool = new osgEarth::Util::MouseCoordsTool( mapNode );
 tool->addCallback( new osgEarth::Util::MouseCoordsLabelCallback(readout, formatter) );
 viewer->addEventHandler( tool );
 // add the state manipulator
    viewer->addEventHandler( new osgGA::StateSetManipulator(viewer->getCamera()->getOrCreateStateSet()) );
 // add the thread model handler
    viewer->addEventHandler(new osgViewer::ThreadingHandler);
 // add the window size toggle handler
    viewer->addEventHandler(new osgViewer::WindowSizeHandler);
 // add the stats handler
    viewer->addEventHandler(new osgViewer::StatsHandler);
 // add the record camera path handler
    viewer->addEventHandler(new osgViewer::RecordCameraPathHandler);
 // add the LOD Scale handler
    viewer->addEventHandler(new osgViewer::LODScaleHandler);
 // add the screen capture handler
    viewer->addEventHandler(new osgViewer::ScreenCaptureHandler);
}
//初始化操纵器
void initManipulator(osgViewer::Viewer* viewer,osgEarth::Map* map)
{
 //操纵器
    osgEarth::Util::EarthManipulator* em=new osgEarth::Util::EarthManipulator();
    //赤道半径
    double equatorRadius=map->getSRS()->getEllipsoid()->getRadiusEquator();//6378137.0
 //初始视点正对中国北京
    em->setHomeViewpoint(osgEarth::Util::Viewpoint(116.3,39.9,0,0,-90,equatorRadius*4));
    viewer->setCameraManipulator(em);
 //定位吉林
    em->setViewpoint(osgEarth::Util::Viewpoint(126,43,0,0,-90,5e4), 5);//5s
}
//初始化其他杂项
void initOther(osgViewer::Viewer* viewer,osgEarth::MapNode* mapNode)
{
 //反锯齿
 osg::DisplaySettings::instance()->setNumMultiSamples( 4 );
 //设置最大PagedLOD节点数目
 //viewer->getDatabasePager()->setTargetMaximumNumberOfPageLOD(10);
    //近地面自动裁剪AutoClipPlaneCullCallback
    viewer->getCamera()->addCullCallback( new osgEarth::Util::AutoClipPlaneCullCallback(mapNode) );
 //绘制经纬度网格
 //osgEarth::Util::GeodeticGraticule* gr = new osgEarth::Util::GeodeticGraticule( mapNode );
 //root->addChild(gr);
}

void main(){
 osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
 //osgViewer::Viewer* viewer = new osgViewer::Viewer;
 osg::Group* root = new osg::Group();
 osg::Node* tankNode = NULL;
 osg::Vec3 tankPosit;
 osg::PositionAttitudeTransform* tankXform;
 //缓存
 osgEarth::Drivers::FileSystemCacheOptions cacheOptions;
 cacheOptions.rootPath() = "./cache";
 osgEarth::MapOptions mapOptions;
 mapOptions.cache() = cacheOptions;
 //osgEarth::Map* map = new osgEarth::Map(mapOptions);
 //osgEarth::MapNode* mapNode = new osgEarth::MapNode( map );
 osg::Node* configEarth = osgDB::readNodeFile("config.earth");
 osgEarth::MapNode* mapNode = osgEarth::MapNode::findMapNode( configEarth );
 osgEarth::Map* map = mapNode->getMap();
 //关闭光照
    mapNode->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
 viewer->setSceneData( root );
 root->addChild(mapNode);
 //读取模型
 tankNode = osgDB::readNodeFile("Models/t72-tank/t72-tank_des.flt");
 tankXform = new osg::PositionAttitudeTransform();
 root->addChild(tankXform);
 tankXform->addChild(tankNode);
 tankPosit.set(5,0,0);
 tankXform->setPosition( tankPosit );
 viewer->setCameraManipulator(new osgGA::TrackballManipulator());

 //地形影像
 //initImageAndElevation(map);

 //矢量
 //initBoundaries(map);

 //操纵器
 initManipulator(viewer, map);

 //事件处理（键盘鼠标）
 initEventHandler(viewer, mapNode);

 //其他
    initOther(viewer, mapNode);

 viewer->realize();

 while( !viewer->done() )
 {
  viewer->frame();
 }
}