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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 OSGEARTH_LOCATORS_H
#define OSGEARTH_LOCATORS_H 1

#include <osgEarth/Common>
#include <osgEarth/GeoData>
#include <osgTerrain/Locator>

namespace osgEarth
{
    class OSGEARTH_EXPORT GeoLocator : public osgTerrain::Locator
    {
    public:
        GeoLocator();

        GeoLocator( const GeoExtent& dataExtent );

        GeoLocator( const osgTerrain::Locator& prototype, const GeoExtent& dataExtent );

        GeoLocator( const osgTerrain::Locator& prototype, const GeoExtent& dataExtent, const GeoExtent& displayExtent );

        static GeoLocator* createForKey( const class TileKey& key, const class MapInfo& mapInfo );
        static GeoLocator* createForExtent( const GeoExtent& extent, const class MapInfo& mapInfo);

        void setDataExtent( const GeoExtent& extent );
        const GeoExtent& getDataExtent() const;

        virtual GeoLocator* cloneAndCrop( const osgTerrain::Locator& prototype, const GeoExtent& displayExtent ) const;

        virtual GeoLocator* getGeographicFromGeocentric( ) const;

        virtual bool isEquivalentTo( const GeoLocator& rhs ) const;
        
    public: // Locator
        virtual bool convertModelToLocal(const osg::Vec3d& world, osg::Vec3d& local) const;

    protected:
        void cropLocal( osg::Vec3d& local ) const;

        bool _inverseCalculated;

    private:
        GeoExtent _dataExtent;
        double _x0, _y0, _x1, _y1;
    };

    
    class OSGEARTH_EXPORT MercatorLocator : public GeoLocator
    {
    public:
        MercatorLocator( const osgTerrain::Locator& prototype, const GeoExtent& dataExtent );

        //virtual bool convertLocalToModel(const osg::Vec3d& local, osg::Vec3d& model) const;
        virtual bool convertModelToLocal(const osg::Vec3d& world, osg::Vec3d& local) const;
        
        virtual GeoLocator* cloneAndCrop( const osgTerrain::Locator& prototype, const GeoExtent& displayExtent );

        virtual GeoLocator* getGeographicFromGeocentric( );

    private:
        GeoExtent _geoDataExtent;
    };
}

#endif // OSGEARTH_LOCATORS_H