double
Feature::eval( NumericExpression& expr, FilterContext const* context ) const
{
const NumericExpression::Variables& vars = expr.variables();
for( NumericExpression::Variables::const_iterator i = vars.begin(); i != vars.end(); ++i )
{
double val = 0.0;
AttributeTable::const_iterator ai = _attrs.find(toLower(i->first));
if (ai != _attrs.end())
{
val = ai->second.getDouble(0.0);
}
else if (context)
{
//No attr found, look for script
ScriptEngine* engine = context->getSession()->getScriptEngine();
if (engine)
{
ScriptResult result = engine->run(i->first, this, context);
if (result.success())
val = result.asDouble();
else {
OE_WARN << LC << "Feature Script error on '" << expr.expr() << "': " << result.message() << std::endl;
}
}
}
expr.set( *i, val); //osgEarth::as<double>(getAttr(i->first),0.0) );
}
return expr.eval();
}
