/* -*-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_BILLBOARD_SYMBOL_H
#define OSGEARTHSYMBOLOGY_BILLBOARD_SYMBOL_H 1

#include <climits>

#include <osgEarth/Common>
#include <osgEarthSymbology/InstanceSymbol>
#include <osg/Vec3f>

namespace osgEarth { namespace Symbology
{
    class InstanceResource;

    /**
     * Represents a 2D camera-facing image
     */
    class OSGEARTHSYMBOLOGY_EXPORT BillboardSymbol : public InstanceSymbol
    {
    public:
        META_Object(osgEarthSymbology, BillboardSymbol);

        BillboardSymbol(const BillboardSymbol& rhs,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
        BillboardSymbol( const Config& conf =Config() );

        /** dtor */
        virtual ~BillboardSymbol() { }

    public: // properties

        /** Width of the billboard image in meters */
        optional<float>& width() { return _width; }
        const optional<float>& width() const { return _width; }

        /** Height of the billboard image in meters */
        optional<float>& height() { return _height; }
        const optional<float>& height() const { return _height; }
        
        
    public: // non-serialized properties (for programmatic use only)

        /** Explicit model to use for model placement */
        void setImage(osg::Image* image) { _image = image; }
        const osg::Image* getImage() const { return _image.get(); }

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

        /** Creates a new (empty) resource appropriate for this symbol */
        virtual InstanceResource* createResource() const;

    protected:
        optional<float> _width;
        optional<float> _height;
        osg::ref_ptr<osg::Image> _image;
    };

} } // namespace osgEarth::Symbology

#endif
