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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_GRATICLE
#define OSGEARTHUTIL_GRATICLE

#include <osgEarthUtil/Common>
#include <osgEarth/Map>
#include <osgEarthSymbology/Style>
#include <vector>

namespace osgEarth { namespace Util
{
    using namespace osgEarth;
    using namespace osgEarth::Symbology;

    class OSGEARTHUTIL_EXPORT Graticule : public osg::Group
    {
    public:

        Graticule( const Map* map );

        void setLineColor( const osg::Vec4f& value );

        void setTextColor( const osg::Vec4f& value ) { _textColor = value; }

        void addLevel( float maxRange, unsigned int cellsX, unsigned int cellsY, double lineWidth );


    private:
        struct Level {
            float _maxRange;
            unsigned int _cellsX, _cellsY;
            double _lineWidth;
        };

        unsigned int getID() const { return _id; }

        bool getLevel( unsigned int level, Graticule::Level& out_level ) const;

        unsigned int getNumLevels() const { return _levels.size(); }

        unsigned int _id;
        bool _autoLevels;
        osg::observer_ptr<const Map> _map;
        std::vector<Level> _levels;
        osg::Vec4f _textColor;
        Style _lineStyle;

        osg::Node* createGridLevel( unsigned int levelNum ) const;
        osg::Node* createTextLevel( unsigned int levelNum ) const;

        friend class GraticuleFactory;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_GRATICLE