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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2015 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_DRIVER_GRATICULE_OPTIONS
#define OSGEARTH_DRIVER_GRATICULE_OPTIONS 1

#include <osgEarth/Common>
#include <osgEarth/URI>
#include <osgEarthSymbology/Color>

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

    /**
     * Options governing normal mapping of the terrain.
     */
    class GraticuleOptions : public DriverConfigOptions // NO EXPORT; header only
    {
    public:
        /** Grid line color */
        optional<Color>& color() { return _color; }
        const optional<Color>& color() const { return _color; }

        /** Label color */
        optional<Color>& labelColor() { return _labelColor; }
        const optional<Color>& labelColor() const { return _labelColor; }

        /** Grid line width in pixels */
        optional<float>& lineWidth() { return _lineWidth; }
        const optional<float>& lineWidth() const { return _lineWidth; }

        /** A target number of grid lines to view on screen at once. */
        optional<int>& gridLines() { return _gridLines; }
        const optional<int>& gridLines() const { return _gridLines; }

        /** Resolutions for the graticule separated by spaces
         *  Resolutions are in degrees listed from lowest to highest resolution
         *  For example:  10 5 2.5 1.25
        */
        optional<std::string>& resolutions() { return _resolutions; }
        const optional<std::string>& resolutions() const { return _resolutions; }

    public: // uniform names
        static const char* resolutionUniformName() { return "oe_graticule_resolution"; }
        static const char* colorUniformName()      { return "oe_graticule_color"; }
        static const char* lineWidthUniformName()  { return "oe_graticule_lineWidth"; }

    public:
        GraticuleOptions( const ConfigOptions& opt =ConfigOptions() ) : DriverConfigOptions( opt )
        {
            setDriver( "graticule" );
            _lineWidth.init ( 1.0f );
            _color.init     ( Color(Color::Yellow, 0.5f) );
            _labelColor.init ( Color::White );
            _gridLines.init(10);
            fromConfig( _conf );
        }

        virtual ~GraticuleOptions() { }

    public:
        Config getConfig() const {
            Config conf = DriverConfigOptions::getConfig();
            conf.addIfSet("line_width", _lineWidth);
            conf.addIfSet("color",      _color);
            conf.addIfSet("label_color", _labelColor );
            conf.addIfSet("grid_lines", _gridLines);
            conf.addIfSet("resolutions", _resolutions);
            return conf;
        }

    protected:
        void mergeConfig( const Config& conf ) {
            DriverConfigOptions::mergeConfig( conf );
            fromConfig( conf );
        }

    private:
        void fromConfig( const Config& conf ) {
            conf.getIfSet("line_width", _lineWidth);
            conf.getIfSet("color",      _color);
            conf.getIfSet("label_color", _labelColor);
            conf.getIfSet("grid_lines", _gridLines);
            conf.getIfSet("resolutions", _resolutions);
        }

        optional<float>       _lineWidth;
        optional<Color>       _color;
        optional<Color>       _labelColor;
        optional<int>         _gridLines;
        optional<std::string> _resolutions;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTH_DRIVER_GRATICULE_OPTIONS