OpenSceneGraph/examples/osgfadetext/osgfadetext.cpp

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#include <osgViewer/Viewer>
#include <osg/Group>
#include <osg/Geode>
#include <osg/ShapeDrawable>
#include <osg/Texture2D>
#include <osg/PositionAttitudeTransform>
#include <osg/MatrixTransform>
#include <osg/CoordinateSystemNode>
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#include <osg/ClusterCullingCallback>
#include <osgDB/FileUtils>
#include <osgDB/ReadFile>
#include <osgText/FadeText>
#include <osgTerrain/DataSet>
#include <osgSim/OverlayNode>
#include <osgSim/SphereSegment>
#include <osgGA/TerrainManipulator>
#include <iostream>
class MyGraphicsContext {
public:
MyGraphicsContext()
{
osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
traits->x = 0;
traits->y = 0;
traits->width = 1;
traits->height = 1;
traits->windowDecoration = false;
traits->doubleBuffer = false;
traits->sharedContext = 0;
traits->pbuffer = true;
_gc = osg::GraphicsContext::createGraphicsContext(traits.get());
if (!_gc)
{
osg::notify(osg::NOTICE)<<"Failed to create pbuffer, failing back to normal graphics window."<<std::endl;
traits->pbuffer = false;
_gc = osg::GraphicsContext::createGraphicsContext(traits.get());
}
if (_gc.valid())
{
_gc->realize();
_gc->makeCurrent();
std::cout<<"Realized window"<<std::endl;
}
}
bool valid() const { return _gc.valid() && _gc->isRealized(); }
private:
osg::ref_ptr<osg::GraphicsContext> _gc;
};
osg::Node* createEarth()
{
osg::ref_ptr<osg::Node> scene;
{
std::string filename = osgDB::findDataFile("Images/land_shallow_topo_2048.jpg");
// make osgTerrain::DataSet quieter..
osgTerrain::DataSet::setNotifyOffset(1);
osg::ref_ptr<osgTerrain::DataSet> dataSet = new osgTerrain::DataSet;
// register the source imagery
{
osgTerrain::DataSet::Source* source = new osgTerrain::DataSet::Source(osgTerrain::DataSet::Source::IMAGE, filename);
source->setCoordinateSystemPolicy(osgTerrain::DataSet::Source::PREFER_CONFIG_SETTINGS);
source->setCoordinateSystem(osgTerrain::DataSet::coordinateSystemStringToWTK("WGS84"));
source->setGeoTransformPolicy(osgTerrain::DataSet::Source::PREFER_CONFIG_SETTINGS_BUT_SCALE_BY_FILE_RESOLUTION);
source->setGeoTransformFromRange(-180.0, 180.0, -90.0, 90.0);
dataSet->addSource(source);
}
// set up destination database paramters.
dataSet->setDatabaseType(osgTerrain::DataSet::LOD_DATABASE);
dataSet->setConvertFromGeographicToGeocentric(true);
dataSet->setDestinationName("test.osg");
// load the source data and record sizes.
dataSet->loadSources();
MyGraphicsContext context;
dataSet->createDestination(30);
if (dataSet->getDatabaseType()==osgTerrain::DataSet::LOD_DATABASE) dataSet->buildDestination();
else dataSet->writeDestination();
scene = dataSet->getDestinationRootNode();
// now we must get rid of all the old OpenGL objects before we start using the scene graph again
// otherwise it'll end up in an inconsistent state.
scene->releaseGLObjects(dataSet->getState());
osg::Texture::flushAllDeletedTextureObjects(0);
osg::Drawable::flushAllDeletedDisplayLists(0);
}
return scene.release();
}
osgText::Text* createText(osg::EllipsoidModel* ellipsoid, double latitude, double longitude, double height, const std::string& str)
{
double X,Y,Z;
ellipsoid->convertLatLongHeightToXYZ( osg::DegreesToRadians(latitude), osg::DegreesToRadians(longitude), height, X, Y, Z);
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osgText::Text* text = new osgText::FadeText;
osg::Vec3 normal = ellipsoid->computeLocalUpVector( X, Y, Z);
text->setCullCallback(new osg::ClusterCullingCallback(osg::Vec3(X,Y,Z), normal, 0.0));
text->setText(str);
text->setFont("fonts/arial.ttf");
text->setPosition(osg::Vec3(X,Y,Z));
text->setCharacterSize(300000.0f);
text->setCharacterSizeMode(osgText::Text::OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT);
text->setAutoRotateToScreen(true);
return text;
}
osg::Node* createFadeText(osg::EllipsoidModel* ellipsoid)
{
osg::Group* group = new osg::Group;
group->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF);
osg::Geode* geode = new osg::Geode;
group->addChild(geode);
std::vector<std::string> textList;
textList.push_back("Town");
textList.push_back("City");
textList.push_back("Village");
textList.push_back("River");
textList.push_back("Mountain");
textList.push_back("Road");
textList.push_back("Lake");
unsigned int numLat = 15;
unsigned int numLong = 20;
double latitude = 0.0;
double longitude = -100.0;
double deltaLatitude = 1.0f;
double deltaLongitude = 1.0f;
unsigned int t = 0;
for(unsigned int i = 0; i < numLat; ++i, latitude += deltaLatitude)
{
double lgnt = longitude;
for(unsigned int j = 0; j < numLong; ++j, ++t, lgnt += deltaLongitude)
{
geode->addDrawable( createText( ellipsoid, latitude, lgnt, 0, textList[t % textList.size()]) );
}
}
return group;
}
int main(int, char**)
{
// construct the viewer.
osgViewer::Viewer viewer;
viewer.getCamera()->setComputeNearFarMode(osg::CullSettings::COMPUTE_NEAR_FAR_USING_PRIMITIVES);
viewer.getCamera()->setNearFarRatio(0.00001f);
// read the scene from the list of file specified commandline args.
osg::ref_ptr<osg::Node> root = createEarth();
if (!root) return 0;
// add a viewport to the viewer and attach the scene graph.
viewer.setSceneData(root.get());
osg::CoordinateSystemNode* csn = dynamic_cast<osg::CoordinateSystemNode*>(root.get());
if (csn)
{
// add fade text around the globe
csn->addChild(createFadeText(csn->getEllipsoidModel()));
}
viewer.setCameraManipulator(new osgGA::TerrainManipulator);
return viewer.run();
}