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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2010 Pelican Mapping
 * http://osgearth.org
 *
 * osgEarth is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */
#ifndef OSGEARTHUTIL_AUTOCLIPPLANEHANDLER_H
#define OSGEARTHUTIL_AUTOCLIPPLANEHANDLER_H

#include <osgEarthUtil/Common>
#include <osgEarth/MapNode>
#include <osgGA/GUIEventHandler>
#include <osgGA/EventVisitor>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;

    class OSGEARTHUTIL_EXPORT AutoClipPlaneHandler : public osgGA::GUIEventHandler
    {
    public:
        AutoClipPlaneHandler( const Map* map =0L );
        
        void setAutoFarPlaneClipping(bool enabled) { _autoFarPlaneClipping = enabled; }
        bool getAutoFarPlaneClipping() const { return _autoFarPlaneClipping; }

        
    public: // EventHandler

        virtual bool handle( const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa );

        void frame( osgGA::GUIActionAdapter& aa );

    private:

        osg::observer_ptr<osgEarth::MapNode> _mapNode;
        bool _geocentric;
        int _frame;
        double _nfrAtRadius, _nfrAtDoubleRadius, _rp;
        bool _autoFarPlaneClipping;
    };


    class OSGEARTHUTIL_EXPORT AutoClipPlaneCallback : public osg::NodeCallback
    {
    public:
        AutoClipPlaneCallback( const Map* map =0L )
        {
            _handler = new AutoClipPlaneHandler( map );
        }

        virtual void operator()( osg::Node* node, osg::NodeVisitor* nv )
        {
            osgGA::EventVisitor* ev = dynamic_cast<osgGA::EventVisitor*>( nv );
            if ( ev ) {
                _handler->frame( *ev->getActionAdapter() );
            }
            traverse( node, nv );
        }

        osg::ref_ptr<AutoClipPlaneHandler> _handler;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_AUTOCLIPPLANEHANDLER_H