function MultiGeometryFromSelection($featureSrvc, $map, $selText)
{
$sel = new MgSelection($map, $selText);
$selLayers = $sel->GetLayers();
$geomColl = new MgGeometryCollection();
$agfRW = new MgAgfReaderWriter();
$simplyPolygonOnly = true;
for ($i = 0; $i < $selLayers->GetCount(); $i++) {
$layer = $selLayers->GetItem($i);
$filter = $sel->GenerateFilter($layer, $layer->GetFeatureClassName());
$query = new MgFeatureQueryOptions();
$query->SetFilter($filter);
$featureSource = new MgResourceIdentifier($layer->GetFeatureSourceId());
$features = $featureSrvc->SelectFeatures($featureSource, $layer->GetFeatureClassName(), $query);
if ($features) {
$classDef = $features->GetClassDefinition();
$geomPropName = $classDef->GetDefaultGeometryPropertyName();
$j = 0;
while ($features->ReadNext()) {
$geomReader = $features->GetGeometry($geomPropName);
$geom = $agfRW->Read($geomReader);
$type = $geom->GetGeometryType();
if ($type == MgGeometryType::MultiPolygon || $type == MgGeometryType::CurvePolygon || $type == MgGeometryType::MultiCurvePolygon) {
$simplyPolygonOnly = false;
} else {
if ($type != MgGeometryType::Polygon) {
continue;
}
}
$geomColl->Add($geom);
}
}
}
if ($geomColl->GetCount() == 0) {
return null;
}
$gf = new MgGeometryFactory();
if ($simplyPolygonOnly) {
$polyColl = new MgPolygonCollection();
for ($i = 0; $i < $geomColl->GetCount(); $i++) {
$polyColl->Add($geomColl->GetItem($i));
}
return $gf->CreateMultiPolygon($polyColl);
} else {
return $gf->CreateMultiGeometry($geomColl);
}
}
