PlaceNode* ClusterNode::getOrCreateLabel()
{
PlaceNode* node = 0;
if (_labelPool.size() <= _nextLabel)
{
// set up a style to use for placemarks:
Style placeStyle;
placeStyle.getOrCreate<TextSymbol>()->declutter() = false;
node = new PlaceNode("", placeStyle, _defaultImage.get());
node->setMapNode(_mapNode.get());
node->setDynamic(true);
_labelPool.push_back(node);
}
else
{
node = _labelPool[_nextLabel].get();
}
++_nextLabel;
return node;
}
int
main(int argc, char** argv)
{
osg::Group* root = new osg::Group();
// try to load an earth file.
osg::ArgumentParser arguments(&argc,argv);
osgViewer::Viewer viewer(arguments);
unsigned int numObjects = 200;
while (arguments.read("--count", numObjects)) {}
bool declutter = false;
if (arguments.read("--declutter")) declutter = true;
// initialize the viewer:
viewer.setCameraManipulator( new EarthManipulator() );
// load an earth file and parse demo arguments
osg::Node* node = MapNodeHelper().load(arguments, &viewer);
if ( !node )
return usage(argv);
// find the map node that we loaded.
MapNode* mapNode = MapNode::findMapNode(node);
if ( !mapNode )
return usage(argv);
root->addChild( node );
// Make a group for 2D items, and activate the decluttering engine. Decluttering
// will migitate overlap between elements that occupy the same screen real estate.
osg::Group* labelGroup = new osg::Group();
root->addChild( labelGroup );
// set up a style to use for placemarks:
Style placeStyle;
placeStyle.getOrCreate<AltitudeSymbol>()->clamping() = AltitudeSymbol::CLAMP_RELATIVE_TO_TERRAIN;
// A lat/long SRS for specifying points.
const SpatialReference* geoSRS = mapNode->getMapSRS()->getGeographicSRS();
//--------------------------------------------------------------------
//Create a bunch of placemarks around Mt Rainer so we can actually get some elevation
{
osg::ref_ptr<osg::Image> pin = osgDB::readRefImageFile( "../data/placemark32.png" );
double centerLat = 46.840866;
double centerLon = -121.769846;
double height = 0.2;
double width = 0.2;
double minLat = centerLat - (height/2.0);
double minLon = centerLon - (width/2.0);
OE_NOTICE << "Placing " << numObjects << " placemarks" << std::endl;
for (unsigned int i = 0; i < numObjects; i++)
{
double lat = minLat + height * (rand() * 1.0)/(RAND_MAX-1);
double lon = minLon + width * (rand() * 1.0)/(RAND_MAX-1);
PlaceNode* place = new PlaceNode("Placemark", placeStyle, pin.get());
place->setMapNode(mapNode);
place->setPosition(GeoPoint(geoSRS, lon, lat));
//Enable occlusion culling. This will hide placemarks that are hidden behind terrain.
//This makes use of the OcclusionCullingCallback in CullingUtils.
place->setOcclusionCulling( true );
labelGroup->addChild( place );
}
}
viewer.setSceneData( root );
viewer.getCamera()->addCullCallback( new AutoClipPlaneCullCallback(mapNode) );
viewer.addEventHandler(new osgViewer::StatsHandler());
viewer.addEventHandler(new osgViewer::WindowSizeHandler());
viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
return viewer.run();
}