/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
 * Copyright 2018 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 OSGEARTHSYMBOLOGY_COVERAGE_SYMBOL_H
#define OSGEARTHSYMBOLOGY_COVERAGE_SYMBOL_H 1

#include <osgEarth/Common>
#include <osgEarthSymbology/Expression>
#include <osgEarthSymbology/Symbol>
#include <osg/Referenced>
#include <vector>

namespace osgEarth { namespace Symbology
{
    /** 
     * Symbol that contains coverage encoding information
     */
    class OSGEARTHSYMBOLOGY_EXPORT CoverageSymbol : public Symbol
    {
    public:
        META_Object(osgEarthSymbology, CoverageSymbol);

        /** construct a symbol */
        CoverageSymbol(const Config& conf =Config());
        CoverageSymbol(const CoverageSymbol& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

        /** coverage value expression; resolves to a 32-bit floating point number. */
        optional<NumericExpression>& valueExpression() { return _valueExpr; }
        const optional<NumericExpression>& valueExpression() const { return _valueExpr; }

    public:
        virtual Config getConfig() const;
        virtual void mergeConfig( const Config& conf );
        static void parseSLD(const Config& c, class Style& style);

    protected:
        optional<NumericExpression> _valueExpr;
        
        /** dtor */
        virtual ~CoverageSymbol() { }
    };

} } // namespace osgEarth::Symbology

#endif // OSGEARTHSYMBOLOGY_COVERAGE_SYMBOL_H
