Hi,
I have a terrain with some roads on it. I want to specify a route by selecting
some roads one after another. So, what I want to do is: select road1, highlight
it, select road2, highlight it ... . For now, only the last selected road will
stay highlight and the other one just return to "normal".
Is there a way to do this ? I'm using osgSim::OverlayNode.
Thx !
Jeff
Code:
void Road::Highlight(osgGIS::FeatureCursor& cursor)
{
//A FilterGraph is a sequence of discrete data-processing units called
Filters
osgGIS::FilterGraph* graph = new osgGIS::FilterGraph();
//Changes the shape type of incoming features
osgGIS::ChangeShapeTypeFilter* change = new osgGIS::ChangeShapeTypeFilter();
//Sets the shape type to which to change all feature shapes, in this
case POLYGON
change->setNewShapeType(osgGIS::GeoShape::TYPE_POLYGON);
//Appends a filter to the end of the graph's filter chain
graph->appendFilter(change);
//Creates a polygon representing a region containing all points within
a certain distance of all points on the source feature
osgGIS::BufferFilter* buffer = new osgGIS::BufferFilter(20); //meters
graph->appendFilter(buffer);
//Transforms feature data by way of spatial reference reprojection
and/or matrix transformation
osgGIS::TransformFilter* xform = new osgGIS::TransformFilter();
//Sets the spatial reference system into which to reproject feature
geodata
xform->setSRS(mTerrain_srs.get());
//Sets whether to localize the feature geodata by transforming it so it
is relative to the centroid of the graph's working extent
xform->setLocalize(true);
graph->appendFilter(xform);
//Assembles feature data into basic fragments (i.e. attributed
drawables). It create basic OSG geometry from GIS feature data
osgGIS::BuildGeomFilter* geom = new osgGIS::BuildGeomFilter();
//Sets the script that evalutes to the color to apply to the geometry
geom->setColorScript(new osgGIS::Script("vec4(1,1,1,1)"));
graph->appendFilter(geom);
graph->appendFilter(new osgGIS::CollectionFilter());
//Assembles Fragment instances into osg::Node instances
osgGIS::BuildNodesFilter* nodes = new osgGIS::BuildNodesFilter();
//Sets whether to disable GL lighting on the resulting node graphs
nodes->setDisableLighting(true);
graph->appendFilter(nodes);
//Compiles all or part of a FeatureLayer into an OSG scene graph
osgGIS::SimpleLayerCompiler compiler(graph);
osg::Node* result = compiler.compile(mLayer.get(), cursor);
//Set the overlay subgraph which will be rendered to texture
mOverlay->setOverlaySubgraph(result);
mOverlay->
//Inform the OverlayNode that the overlay texture needs to be updated
mOverlay->dirtyOverlayTexture();
}
[/code]
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http://forum.openscenegraph.org/viewtopic.php?p=19839#19839
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