/home/cube/sources/osgearth/src/osgEarthUtil/ElevationManager

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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_ELEVATION_MANAGER_H
#define OSGEARTHUTIL_ELEVATION_MANAGER_H

#include <osgEarthUtil/Common>
#include <osgEarth/Map>
#include <osgEarth/MapNode>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;

    class OSGEARTHUTIL_EXPORT ElevationManager : public osg::Referenced
    {
    public:
        enum Technique
        {
            TECHNIQUE_GEOMETRIC,

            TECHNIQUE_PARAMETRIC
        };

    public:
        ElevationManager( Map* map );

        bool getElevation(
            double x, double y,
            double resolution,
            const SpatialReference* srs,
            double& out_elevation,
            double& out_resolution);

        bool getPlacementMatrix(
            double x, double y, double z,
            double resolution,
            const SpatialReference* srs,
            osg::Matrixd& out_matrix,
            double& out_elevation,
            double& out_resolution);

        void setTechnique( Technique technique );

        Technique getTechnique() const;

        void setMaxTilesToCache( int value );

        int getMaxTilesToCache() const;

        void setInterpolation( ElevationInterpolation interp );

        ElevationInterpolation getElevationInterpolation() const;

        void setMaxLevelOverride(int maxLevelOverride);

        int getMaxLevelOverride() const;

    private:
        MapFrame _mapf;
        typedef std::map< osgTerrain::TileID, osg::ref_ptr<osgTerrain::TerrainTile> > TileTable;
        TileTable _tileCache;
        typedef std::list< osgTerrain::TileID > TileIdList;
        TileIdList _tileCacheFIFO;
        int _maxCacheSize;
        int _tileSize;
        unsigned int _maxDataLevel;
        int _maxLevelOverride;
        Technique _technique;
        ElevationInterpolation _interpolation;

    private:
        void postCTOR();
        void sync();

        bool getElevationImpl(
            double x, double y,
            double resolution,
            const SpatialReference* srs,
            double& out_elevation,
            double& out_resolution);
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_ELEVATION_MANAGER_H