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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 OSGEARTHSYMBOLOGY_ALTITUDE_SYMBOL_H
#define OSGEARTHSYMBOLOGY_ALTITUDE_SYMBOL_H 1

#include <osgEarthSymbology/Symbol>
#include <osgEarthSymbology/Expression>

namespace osgEarth { namespace Symbology
{
    class OSGEARTHSYMBOLOGY_EXPORT AltitudeSymbol : public Symbol
    {
    public:
        enum Clamping
        {
            CLAMP_NONE,

            CLAMP_TO_TERRAIN,

            CLAMP_ABSOLUTE,

            CLAMP_RELATIVE_TO_TERRAIN
        };

    public:
        AltitudeSymbol( const Config& conf =Config() );

        optional<Clamping>& clamping() { return _clamping; }
        const optional<Clamping>& clamping() const { return _clamping; }

        optional<float>& clampingResolution() { return _clampingResolution; }
        const optional<float>& clampingResolution() const { return _clampingResolution; }

        optional<NumericExpression>& verticalOffset() { return _verticalOffset; }
        const optional<NumericExpression>& verticalOffset() const { return _verticalOffset; }

        optional<NumericExpression>& verticalScale() { return _verticalScale; }
        const optional<NumericExpression>& verticalScale() const { return _verticalScale; }

    public:
        virtual Config getConfig() const;
        virtual void mergeConfig( const Config& conf );

    protected:
        optional<Clamping>           _clamping;
        optional<float>              _clampingResolution;
        optional<NumericExpression>  _verticalOffset;
        optional<NumericExpression>  _verticalScale;
    };

} } // namespace osgEarth::Symbology

#endif // OSGEARTH_SYMBOLOGY_SYMBOL_H