/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * 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
 * OpenSceneGraph Public License for more details.
*/

#ifndef OSGGA_FLIGHT_MANIPULATOR
#define OSGGA_FLIGHT_MANIPULATOR 1

#include <osgGA/FirstPersonManipulator>


namespace osgGA {


/** FlightManipulator is a MatrixManipulator which provides flight simulator-like
 *  updating of the camera position & orientation. By default, the left mouse
 *  button accelerates, the right mouse button decelerates, and the middle mouse
 *  button (or left and right simultaneously) stops dead.
 */
class OSGGA_EXPORT FlightManipulator : public FirstPersonManipulator
{
        typedef FirstPersonManipulator inherited;

    public:

        enum YawControlMode
        {
            YAW_AUTOMATICALLY_WHEN_BANKED,
            NO_AUTOMATIC_YAW
        };

        FlightManipulator( int flags = UPDATE_MODEL_SIZE | COMPUTE_HOME_USING_BBOX );
        FlightManipulator( const FlightManipulator& fpm,
                           const osg::CopyOp& copyOp = osg::CopyOp::SHALLOW_COPY );

        META_Object( osgGA, FlightManipulator );

        virtual void setYawControlMode( YawControlMode ycm );
        inline YawControlMode getYawControlMode() const;

        virtual void home( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual void init( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual void getUsage( osg::ApplicationUsage& usage ) const;

    protected:

        virtual bool handleFrame( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool handleMouseMove( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool handleMouseDrag( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool handleMousePush( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool handleMouseRelease( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool handleKeyDown( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );
        virtual bool flightHandleEvent( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us );

        virtual bool performMovement();
        virtual bool performMovementLeftMouseButton( const double eventTimeDelta, const double dx, const double dy );
        virtual bool performMovementMiddleMouseButton( const double eventTimeDelta, const double dx, const double dy );
        virtual bool performMovementRightMouseButton( const double eventTimeDelta, const double dx, const double dy );

        YawControlMode _yawMode;

};


//
//  inline methods
//

/// Returns the Yaw control for the flight model.
inline FlightManipulator::YawControlMode FlightManipulator::getYawControlMode() const  { return _yawMode; }


}

#endif /* OSGGA_FLIGHT_MANIPULATOR */