133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
#include <osgViewer/Viewer>
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#include <osg/Group>
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#include <osg/Geode>
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#include <osg/ShapeDrawable>
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#include <osg/Texture2D>
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#include <osg/PositionAttitudeTransform>
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#include <osg/MatrixTransform>
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#include <osg/CoordinateSystemNode>
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#include <osg/ClusterCullingCallback>
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#include <osgDB/FileUtils>
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#include <osgDB/ReadFile>
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#include <osgText/FadeText>
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#include <osgSim/OverlayNode>
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#include <osgSim/SphereSegment>
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#include <osgGA/TerrainManipulator>
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#include <iostream>
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osg::Node* createEarth()
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{
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osg::TessellationHints* hints = new osg::TessellationHints;
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hints->setDetailRatio(5.0f);
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osg::ShapeDrawable* sd = new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0.0,0.0,0.0), osg::WGS_84_RADIUS_POLAR), hints);
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osg::Geode* geode = new osg::Geode;
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geode->addDrawable(sd);
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std::string filename = osgDB::findDataFile("Images/land_shallow_topo_2048.jpg");
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geode->getOrCreateStateSet()->setTextureAttributeAndModes(0, new osg::Texture2D(osgDB::readImageFile(filename)));
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osg::CoordinateSystemNode* csn = new osg::CoordinateSystemNode;
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csn->setEllipsoidModel(new osg::EllipsoidModel());
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csn->addChild(geode);
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return csn;
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}
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osgText::Text* createText(osg::EllipsoidModel* ellipsoid, double latitude, double longitude, double height, const std::string& str)
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{
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double X,Y,Z;
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ellipsoid->convertLatLongHeightToXYZ( osg::DegreesToRadians(latitude), osg::DegreesToRadians(longitude), height, X, Y, Z);
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osgText::Text* text = new osgText::FadeText;
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osg::Vec3 normal = ellipsoid->computeLocalUpVector( X, Y, Z);
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text->setCullCallback(new osg::ClusterCullingCallback(osg::Vec3(X,Y,Z), normal, 0.0));
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text->setText(str);
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text->setFont("fonts/arial.ttf");
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text->setPosition(osg::Vec3(X,Y,Z));
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text->setCharacterSize(300000.0f);
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text->setCharacterSizeMode(osgText::Text::OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT);
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text->setAutoRotateToScreen(true);
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return text;
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}
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osg::Node* createFadeText(osg::EllipsoidModel* ellipsoid)
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{
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osg::Group* group = new osg::Group;
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group->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
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osg::Geode* geode = new osg::Geode;
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group->addChild(geode);
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std::vector<std::string> textList;
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textList.push_back("Town");
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textList.push_back("City");
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textList.push_back("Village");
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textList.push_back("River");
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textList.push_back("Mountain");
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textList.push_back("Road");
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textList.push_back("Lake");
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unsigned int numLat = 15;
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unsigned int numLong = 20;
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double latitude = 0.0;
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double longitude = -100.0;
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double deltaLatitude = 1.0f;
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double deltaLongitude = 1.0f;
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unsigned int t = 0;
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for(unsigned int i = 0; i < numLat; ++i, latitude += deltaLatitude)
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{
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double lgnt = longitude;
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for(unsigned int j = 0; j < numLong; ++j, ++t, lgnt += deltaLongitude)
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{
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geode->addDrawable( createText( ellipsoid, latitude, lgnt, 0, textList[t % textList.size()]) );
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}
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}
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return group;
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}
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int main(int, char**)
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{
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// construct the viewer.
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osgViewer::Viewer viewer;
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viewer.getCamera()->setComputeNearFarMode(osg::CullSettings::COMPUTE_NEAR_FAR_USING_PRIMITIVES);
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viewer.getCamera()->setNearFarRatio(0.00001f);
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// read the scene from the list of file specified commandline args.
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osg::ref_ptr<osg::Node> root = createEarth();
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if (!root) return 0;
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// add a viewport to the viewer and attach the scene graph.
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viewer.setSceneData(root.get());
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osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(root.get());
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if (csn)
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{
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// add fade text around the globe
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csn->addChild(createFadeText(csn->getEllipsoidModel()));
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}
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viewer.setCameraManipulator(new osgGA::TerrainManipulator);
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return viewer.run();
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}
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