/**
* Builds a collection of style groups by processing a StyleSelector.
*/
void
FeatureModelGraph::buildStyleGroups(const StyleSelector* selector,
const Query& baseQuery,
FeatureSourceIndex* index,
osg::Group* parent)
{
// if the selector uses an expression to select the style name, then we must perform the
// query and then SORT the features into style groups.
if ( selector->styleExpression().isSet() )
{
// merge the selector's query into the existing query
Query combinedQuery = baseQuery.combineWith( *selector->query() );
// query, sort, and add each style group to the parent:
queryAndSortIntoStyleGroups( combinedQuery, *selector->styleExpression(), index, parent );
}
// otherwise, all feature returned by this query will have the same style:
else
{
// combine the selection style with the incoming base style:
const Style* selectedStyle = _session->styles()->getStyle(selector->getSelectedStyleName());
Style style;
if ( selectedStyle )
style = *selectedStyle;
// .. and merge it's query into the existing query
Query combinedQuery = baseQuery.combineWith( *selector->query() );
// then create the node.
osg::Node* node = createStyleGroup( style, combinedQuery, index );
if ( node && !parent->containsNode(node) )
parent->addChild( node );
}
}
osg::Group*
FeatureModelGraph::build( const FeatureLevel& level, const GeoExtent& extent, const TileKey* key )
{
osg::ref_ptr<osg::Group> group = new osg::Group();
// form the baseline query, which does a spatial query based on the working extent.
Query query;
if ( extent.isValid() )
query.bounds() = extent.bounds();
// add a tile key to the query if there is one, to support TFS-style queries
if ( key )
query.tileKey() = *key;
// now, go through any level-based selectors.
const StyleSelectorVector& levelSelectors = level.selectors();
// if there are none, just build once with the default style and query.
if ( levelSelectors.size() == 0 )
{
osg::Node* node = build( Style(), query, extent );
if ( node )
group->addChild( node );
}
else
{
for( StyleSelectorVector::const_iterator i = levelSelectors.begin(); i != levelSelectors.end(); ++i )
{
const StyleSelector& selector = *i;
// fetch the selector's style:
Style selectorStyle;
_styles.getStyle( selector.getSelectedStyleName(), selectorStyle );
// combine the selector's query, if it has one:
Query selectorQuery =
selector.query().isSet() ? query.combineWith( *selector.query() ) : query;
osg::Node* node = build( selectorStyle, selectorQuery, extent );
if ( node )
group->addChild( node );
}
}
if ( group->getNumChildren() > 0 )
{
// account for a min-range here.
if ( level.minRange() > 0.0f )
{
osg::LOD* lod = new osg::LOD();
lod->addChild( group.get(), level.minRange(), FLT_MAX );
group = lod;
}
if ( _session->getMapInfo().isGeocentric() && _options.clusterCulling() == true )
{
const GeoExtent& ccExtent = extent.isValid() ? extent : _source->getFeatureProfile()->getExtent();
if ( ccExtent.isValid() )
{
// if the extent is more than 90 degrees, bail
GeoExtent geodeticExtent = ccExtent.transform( ccExtent.getSRS()->getGeographicSRS() );
if ( geodeticExtent.width() < 90.0 && geodeticExtent.height() < 90.0 )
{
// get the geocentric tile center:
osg::Vec3d tileCenter;
ccExtent.getCentroid( tileCenter.x(), tileCenter.y() );
osg::Vec3d centerECEF;
ccExtent.getSRS()->transformToECEF( tileCenter, centerECEF );
osg::NodeCallback* ccc = ClusterCullerFactory::create( group.get(), centerECEF );
if ( ccc )
group->addCullCallback( ccc );
}
}
}
return group.release();
}
else
{
return 0L;
}
}