/**
* Creates a complete set of positioned label nodes from a feature list.
*/
osg::Node* createNode(
const FeatureList& input,
const Style& style,
FilterContext& context )
{
if ( style.get<TextSymbol>() == 0L && style.get<IconSymbol>() == 0L )
return 0L;
// copy the style so we can (potentially) modify the text symbol.
Style styleCopy = style;
TextSymbol* text = styleCopy.get<TextSymbol>();
IconSymbol* icon = styleCopy.get<IconSymbol>();
osg::Group* group = new osg::Group();
StringExpression textContentExpr ( text ? *text->content() : StringExpression() );
NumericExpression textPriorityExpr( text ? *text->priority() : NumericExpression() );
NumericExpression textSizeExpr ( text ? *text->size() : NumericExpression() );
StringExpression iconUrlExpr ( icon ? *icon->url() : StringExpression() );
NumericExpression iconScaleExpr ( icon ? *icon->scale() : NumericExpression() );
NumericExpression iconHeadingExpr ( icon ? *icon->heading() : NumericExpression() );
for( FeatureList::const_iterator i = input.begin(); i != input.end(); ++i )
{
Feature* feature = i->get();
if ( !feature )
continue;
// run a symbol script if present.
if ( text && text->script().isSet() )
{
StringExpression temp( text->script().get() );
feature->eval( temp, &context );
}
// run a symbol script if present.
if ( icon && icon->script().isSet() )
{
StringExpression temp( icon->script().get() );
feature->eval( temp, &context );
}
const Geometry* geom = feature->getGeometry();
if ( !geom )
continue;
Style tempStyle = styleCopy;
// evaluate expressions into literals.
// TODO: Later we could replace this with a generate "expression evaluator" type
// that we could pass to PlaceNode in the DB options. -gw
if ( text )
{
if ( text->content().isSet() )
tempStyle.get<TextSymbol>()->content()->setLiteral( feature->eval( textContentExpr, &context ) );
if ( text->size().isSet() )
tempStyle.get<TextSymbol>()->size()->setLiteral( feature->eval(textSizeExpr, &context) );
}
if ( icon )
{
if ( icon->url().isSet() )
tempStyle.get<IconSymbol>()->url()->setLiteral( feature->eval(iconUrlExpr, &context) );
if ( icon->scale().isSet() )
tempStyle.get<IconSymbol>()->scale()->setLiteral( feature->eval(iconScaleExpr, &context) );
if ( icon->heading().isSet() )
tempStyle.get<IconSymbol>()->heading()->setLiteral( feature->eval(iconHeadingExpr, &context) );
}
osg::Node* node = makePlaceNode(
context,
feature,
tempStyle,
textPriorityExpr);
if ( node )
{
if ( context.featureIndex() )
{
context.featureIndex()->tagNode(node, feature);
}
group->addChild( node );
}
}
// Note to self: need to change this to support picking later. -gw
//VirtualProgram* vp = VirtualProgram::getOrCreate(group->getOrCreateStateSet());
//vp->setInheritShaders( false );
return group;
}
void
TrackNode::init( const TrackNodeFieldSchema& schema )
{
osg::StateSet* ss = this->getOrCreateStateSet();
ScreenSpaceLayout::activate(ss);
// Disable lighting for place nodes by default
ss->setDefine(OE_LIGHTING_DEFINE, osg::StateAttribute::OFF);
osgEarth::clearChildren( getPositionAttitudeTransform() );
_geode = new osg::Geode();
IconSymbol* icon = _style.get<IconSymbol>();
osg::Image* image = icon ? icon->getImage() : 0L;
if ( icon && image )
{
// apply the image icon.
osg::Geometry* imageGeom = AnnotationUtils::createImageGeometry(
image, // image
osg::Vec2s(0,0), // offset
0, // tex image unit
icon->heading()->eval(),
icon->scale()->eval() );
if ( imageGeom )
{
_geode->addDrawable( imageGeom );
ScreenSpaceLayoutData* layout = new ScreenSpaceLayoutData();
layout->setPriority(getPriority());
imageGeom->setUserData(layout);
}
}
if ( !schema.empty() )
{
// turn the schema defs into text drawables and record a map so we can
// set the field text later.
for( TrackNodeFieldSchema::const_iterator i = schema.begin(); i != schema.end(); ++i )
{
const TrackNodeField& field = i->second;
if ( field._symbol.valid() )
{
osg::Vec3 offset(
field._symbol->pixelOffset()->x(),
field._symbol->pixelOffset()->y(),
0.0);
osg::Drawable* drawable = AnnotationUtils::createTextDrawable(
field._symbol->content()->expr(), // text
field._symbol.get(), // symbol
offset ); // offset
if ( drawable )
{
// if the user intends to change the label later, make it dynamic
// since osgText updates are not thread-safe
if ( field._dynamic )
drawable->setDataVariance( osg::Object::DYNAMIC );
else
drawable->setDataVariance( osg::Object::STATIC );
addDrawable( i->first, drawable );
}
}
}
}
// ensure depth testing always passes, and disable depth buffer writes.
osg::StateSet* stateSet = _geode->getOrCreateStateSet();
stateSet->setAttributeAndModes( new osg::Depth(osg::Depth::ALWAYS, 0, 1, false), 1 );
applyStyle( _style );
setLightingIfNotSet( false );
getPositionAttitudeTransform()->addChild( _geode );
// generate shaders:
Registry::shaderGenerator().run(
this,
"osgEarth.TrackNode",
Registry::stateSetCache() );
}