/**
* Creates a simple label. The caller is responsible for placing it in the scene.
*/
osg::Node* createNode(
const std::string& text,
const TextSymbol* symbol )
{
Controls::LabelControl* label = new Controls::LabelControl( text );
if ( symbol )
{
if ( symbol->fill().isSet() )
label->setForeColor( symbol->fill()->color() );
if ( symbol->halo().isSet() )
label->setHaloColor( symbol->halo()->color() );
if ( symbol->size().isSet() )
label->setFontSize( *symbol->size() );
if ( symbol->font().isSet() )
label->setFont( osgText::readFontFile(*symbol->font()) );
if ( symbol->encoding().isSet() )
{
osgText::String::Encoding enc;
switch(symbol->encoding().value())
{
case TextSymbol::ENCODING_ASCII: enc = osgText::String::ENCODING_ASCII; break;
case TextSymbol::ENCODING_UTF8: enc = osgText::String::ENCODING_UTF8; break;
case TextSymbol::ENCODING_UTF16: enc = osgText::String::ENCODING_UTF16; break;
case TextSymbol::ENCODING_UTF32: enc = osgText::String::ENCODING_UTF32; break;
default: enc = osgText::String::ENCODING_UNDEFINED; break;
}
label->setEncoding( enc );
}
}
Controls::ControlNode* node = new Controls::ControlNode( label );
return node;
}
/**
* Creates a complete set of positioned label nodes from a feature list.
*/
osg::Node* createNode(
const FeatureList& input,
const TextSymbol* text,
const FilterContext& context )
{
osg::Group* group = 0L;
std::set<std::string> used; // to prevent dupes
bool skipDupes = (text->removeDuplicateLabels() == true);
StringExpression contentExpr ( *text->content() );
NumericExpression priorityExpr( *text->priority() );
bool makeECEF = false;
if ( context.isGeoreferenced() )
{
makeECEF = context.getSession()->getMapInfo().isGeocentric();
}
for( FeatureList::const_iterator i = input.begin(); i != input.end(); ++i )
{
const Feature* feature = i->get();
if ( !feature )
continue;
const Geometry* geom = feature->getGeometry();
if ( !geom )
continue;
osg::Vec3d centroid = geom->getBounds().center();
if ( makeECEF )
{
context.profile()->getSRS()->transformToECEF( centroid, centroid );
}
const std::string& value = feature->eval( contentExpr, &context );
if ( !value.empty() && (!skipDupes || used.find(value) == used.end()) )
{
if ( !group )
{
group = new osg::Group();
}
double priority = feature->eval( priorityExpr, &context );
Controls::LabelControl* label = new Controls::LabelControl( value );
if ( text->fill().isSet() )
label->setForeColor( text->fill()->color() );
if ( text->halo().isSet() )
label->setHaloColor( text->halo()->color() );
if ( text->size().isSet() )
label->setFontSize( *text->size() );
if ( text->font().isSet() )
label->setFont( osgText::readFontFile(*text->font()) );
Controls::ControlNode* node = new Controls::ControlNode( label, priority );
osg::MatrixTransform* xform = new osg::MatrixTransform( osg::Matrixd::translate(centroid) );
xform->addChild( node );
// for a geocentric map, do a simple dot product cull.
if ( makeECEF )
{
xform->setCullCallback( new CullNodeByHorizon(
centroid,
context.getSession()->getMapInfo().getProfile()->getSRS()->getEllipsoid()) );
group->addChild( xform );
}
else
{
group->addChild( xform );
}
if ( skipDupes )
{
used.insert( value );
}
}
}
return group;
}
