+void NavDisplay::computeCustomSymbolStates(const SGPropertyNode* sym, string_set& states)
+{
+ BOOST_FOREACH(SGPropertyNode* st, sym->getChildren("state")) {
+ states.insert(st->getStringValue());
+ }
+}
+
+void NavDisplay::processCustomSymbols()
+{
+ for (int i = _customSymbols->nChildren() - 1; i >= 0; i--) {
+ SGPropertyNode *symNode = _customSymbols->getChild(i);
+ if (!symNode->nChildren()) {
+ continue;
+ }
+ string_set ss;
+ computeCustomSymbolStates(symNode, ss);
+ SymbolRuleVector rules;
+ findRules(symNode->getName(), ss, rules);
+ if (rules.empty()) {
+ return; // no rules matched, we can skip this item
+ }
+
+ double heading = symNode->getDoubleValue("true-heading-deg", 0.0);
+ SGGeod pos = SGGeod::fromDegFt(symNode->getDoubleValue("longitude-deg"),
+ symNode->getDoubleValue("latitude-deg"),
+ symNode->getDoubleValue("altitude-ft"));
+
+
+ osg::Vec2 projected = projectGeod(pos);
+ BOOST_FOREACH(SymbolRule* r, rules) {
+ addSymbolInstance(projected, heading, r->getDefinition(), symNode);
+ }
+ } // of custom symbols iteration
+}
+
+