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+// Copyright (C) 2009 - 2012  Mathias Froehlich
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program 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
+// 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.
+
+#ifndef _HLACameraManipulator_hxx
+#define _HLACameraManipulator_hxx
+
+#include <osgGA/CameraManipulator>
+#include <simgear/scene/util/OsgMath.hxx>
+#include "HLAPerspectiveViewer.hxx"
+
+namespace fgviewer  {
+
+class Viewer;
+
+class HLACameraManipulator : public osgGA::CameraManipulator {
+public:
+    HLACameraManipulator(HLAPerspectiveViewer* perspectiveViewer = 0);
+    HLACameraManipulator(const HLACameraManipulator& cameraManipulator, const osg::CopyOp& copyOp = osg::CopyOp::SHALLOW_COPY);
+    virtual ~HLACameraManipulator();
+
+    META_Object(fgviewer, HLACameraManipulator);
+
+    virtual void setByMatrix(const osg::Matrixd& matrix);
+    virtual void setByInverseMatrix(const osg::Matrixd& matrix);
+
+    virtual osg::Matrixd getMatrix() const;
+    virtual osg::Matrixd getInverseMatrix() const;
+
+    /** Handle events, return true if handled, false otherwise. */
+    virtual bool handle(const osgGA::GUIEventAdapter& eventAdapter, osgGA::GUIActionAdapter& actionAdapter);
+
+protected:
+    bool _handle(const osgGA::GUIEventAdapter& eventAdapter, Viewer& viewer);
+    void _handleFrameEvent(osgGA::GUIActionAdapter& actionAdapter);
+    bool _handleKeyDownEvent(const osgGA::GUIEventAdapter& eventAdapter, Viewer& viewer);
+    bool _handleKeyUpEvent(const osgGA::GUIEventAdapter& eventAdapter, Viewer& viewer);
+    void _incrementEyePosition(const SGVec3d& offset);
+    void _resetView();
+    void _rotateView(const osg::Vec2& inc);
+    void _rotateSun(const osg::Vec2& inc, Viewer& viewer);
+
+private:
+    osg::Matrixd _viewMatrix;
+    osg::Matrixd _inverseViewMatrix;
+    osg::Vec2 _lastMousePos;
+    SGSharedPtr<HLAPerspectiveViewer> _perspectiveViewer;
+};
+
+} // namespace fgviewer
+
+#endif