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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 OSGEARTHFEATURES_BUFFER_FILTER_H
#define OSGEARTHFEATURES_BUFFER_FILTER_H 1

#include <osgEarthFeatures/Common>
#include <osgEarthFeatures/Feature>
#include <osgEarthFeatures/Filter>
#include <osgEarthSymbology/Style>
#include <osg/Geode>

namespace osgEarth { namespace Features
{
    using namespace osgEarth;
    using namespace osgEarth::Symbology;

    class OSGEARTHFEATURES_EXPORT BufferFilter : public FeatureFilter
    {
    public:
        // Call this determine whether this filter is available. This filter uses
        // the GEOS library, so you must compile osgEarth against GEOS for this 
        // filter to be available.
        static bool isSupported();

    public:
        BufferFilter();
        BufferFilter( const BufferFilter& rhs );

    public:
        // how far to buffer; positive to dialate, negative to erode
        optional<double>& distance() { return _distance; }
        const optional<double>& distance() const { return _distance; }

        // for ENDCAP_ROUND, controls the tessellation detail for corners, 
        // measured in the number of segments to create per 90 degrees
        int numQuadrantSegments() const { return _numQuadSegs; }
        int& numQuadrantSegments() { return _numQuadSegs; }

        // tessellation style of buffered corners and line ends
        const Stroke::LineCapStyle& capStyle() const { return _capStyle; }
        Stroke::LineCapStyle& capStyle() { return _capStyle; }

    public:
        virtual FilterContext push( FeatureList& input, FilterContext& context );

    protected:
        optional<double> _distance;
        int _numQuadSegs;
        Stroke::LineCapStyle _capStyle;
    };

} } // namespace osgEarth::Features

#endif // OSGEARTHFEATURES_BUFFER_FILTER_H