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+// Copyright (C) 2009 - 2012  Mathias Froehlich - Mathias.Froehlich@web.de
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Library General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "HLAPerspectiveViewerClass.hxx"
+
+#include "HLAPerspectiveViewer.hxx"
+
+namespace fgviewer {
+
+HLAPerspectiveViewerClass::HLAPerspectiveViewerClass(const std::string& name, simgear::HLAFederate* federate) :
+    HLAViewerClass(name, federate)
+{
+}
+
+HLAPerspectiveViewerClass::~HLAPerspectiveViewerClass()
+{
+}
+
+simgear::HLAObjectInstance*
+HLAPerspectiveViewerClass::createObjectInstance(const std::string& name)
+{
+    return new HLAPerspectiveViewer(this, getFederate());
+}
+
+void
+HLAPerspectiveViewerClass::createAttributeDataElements(simgear::HLAObjectInstance& objectInstance)
+{
+   if (_viewNameIndex.empty())
+        _viewNameIndex = getDataElementIndex("viewName");
+   if (_positionIndex.empty())
+        _positionIndex = getDataElementIndex("location.position");
+   if (_orientationIndex.empty())
+        _orientationIndex = getDataElementIndex("location.orientation");
+   if (_zoomFactorIndex.empty())
+        _zoomFactorIndex = getDataElementIndex("zoomFactor");
+   if (_eyeTrackerNameIndex.empty())
+        _eyeTrackerNameIndex = getDataElementIndex("eyeTrackerName");
+
+    HLAViewerClass::createAttributeDataElements(objectInstance);
+}
+
+} // namespace fgviewer