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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 "HLAPerspectiveViewer.hxx"
+
+#include "HLAPerspectiveViewerClass.hxx"
+
+namespace fgviewer {
+
+HLAPerspectiveViewer::HLAPerspectiveViewer(HLAPerspectiveViewerClass* objectClass, const SGWeakPtr<simgear::HLAFederate>& federate) :
+    HLAViewer(objectClass),
+    _view(federate),
+    _zoomFactor(1),
+    _eyeTracker(federate)
+{
+}
+
+HLAPerspectiveViewer::~HLAPerspectiveViewer()
+{
+}
+
+void
+HLAPerspectiveViewer::createAttributeDataElements()
+{
+    HLAViewer::createAttributeDataElements();
+
+    assert(dynamic_cast<HLAPerspectiveViewerClass*>(getObjectClass().get()));
+    HLAPerspectiveViewerClass& objectClass = static_cast<HLAPerspectiveViewerClass&>(*getObjectClass());
+
+    setAttributeDataElement(objectClass.getViewNameIndex(), _view.getDataElement());
+    setAttributeDataElement(objectClass.getPositionIndex(), _position.getDataElement());
+    setAttributeDataElement(objectClass.getOrientationIndex(), _orientation.getDataElement());
+    setAttributeDataElement(objectClass.getZoomFactorIndex(), _zoomFactor.getDataElement());
+    setAttributeDataElement(objectClass.getEyeTrackerNameIndex(), _eyeTracker.getDataElement());
+}
+
+const HLAView*
+HLAPerspectiveViewer::getView() const
+{
+    return _view.getObject();
+}
+
+HLAView*
+HLAPerspectiveViewer::getView()
+{
+    return _view.getObject();
+}
+
+void
+HLAPerspectiveViewer::setView(HLAView* view)
+{
+    _view.setObject(view);
+}
+
+const HLAEyeTracker*
+HLAPerspectiveViewer::getEyeTracker() const
+{
+    return _eyeTracker.getObject();
+}
+
+HLAEyeTracker*
+HLAPerspectiveViewer::getEyeTracker()
+{
+    return _eyeTracker.getObject();
+}
+
+void
+HLAPerspectiveViewer::setEyeTracker(HLAEyeTracker* eyeTracker)
+{
+    _eyeTracker.setObject(eyeTracker);
+}
+
+SGLocationd
+HLAPerspectiveViewer::getLocation(const SGTimeStamp& simTime) const
+{
+    const HLAView* view = getView();
+    if (!view)
+        return SGLocationd(getPosition(), getOrientation());
+    return view->getLocation(simTime).getAbsoluteLocation(SGLocationd(getPosition(), getOrientation()));
+}
+
+SGVec3d
+HLAPerspectiveViewer::getLeftEyeOffset() const
+{
+    const HLAEyeTracker* eyeTracker = getEyeTracker();
+    if (!eyeTracker)
+        return SGVec3d(0, 0, 0);
+    return eyeTracker->getLeftEyeOffset();
+}
+
+SGVec3d
+HLAPerspectiveViewer::getRightEyeOffset() const
+{
+    const HLAEyeTracker* eyeTracker = getEyeTracker();
+    if (!eyeTracker)
+        return SGVec3d(0, 0, 0);
+    return eyeTracker->getRightEyeOffset();
+}
+
+} // namespace fgviewer