BufferBuilder.h

/**********************************************************************
 * $Id: BufferBuilder.h 2559 2009-06-08 10:07:05Z strk $
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.refractions.net
 *
 * Copyright (C) 2009 Sandro Santilli <strk@keybit.net>
 * Copyright (C) 2006-2007 Refractions Research Inc.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Public Licence as published
 * by the Free Software Foundation. 
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: operation/buffer/BufferBuilder.java rev. 1.30 (JTS-1.10)
 *
 **********************************************************************/

#ifndef GEOS_OP_BUFFER_BUFFERBUILDER_H
#define GEOS_OP_BUFFER_BUFFERBUILDER_H

#include <geos/export.h>

#include <vector>

#include <geos/operation/buffer/BufferOp.h> // for inlines (BufferOp enums)
#include <geos/operation/buffer/OffsetCurveBuilder.h> // for inline (OffsetCurveBuilder enums)
#include <geos/geomgraph/EdgeList.h> // for composition

// Forward declarations
namespace geos {
        namespace geom {
                class PrecisionModel;
                class Geometry;
                class GeometryFactory;
        }
        namespace algorithm {
                class CGAlgorithms;
                class LineIntersector;
        }
        namespace noding {
                class Noder;
                class SegmentString;
                class IntersectionAdder;
        }
        namespace geomgraph {
                class Edge;
                class Label;
                class PlanarGraph;
        }
        namespace operation {
                namespace buffer {
                        class BufferSubgraph;
                }
                namespace overlay {
                        class PolygonBuilder;
                }
        }
}

namespace geos {
namespace operation { // geos.operation
namespace buffer { // geos.operation.buffer

class GEOS_DLL BufferBuilder {

private:
        static int depthDelta(geomgraph::Label *label);

        const BufferParameters& bufParams; 

        const geom::PrecisionModel* workingPrecisionModel;

        algorithm::LineIntersector* li;

        noding::IntersectionAdder* intersectionAdder;

        noding::Noder* workingNoder;

        const geom::GeometryFactory* geomFact;

        geomgraph::EdgeList edgeList;

        std::vector<geomgraph::Label *> newLabels;

        void computeNodedEdges(std::vector<noding::SegmentString*>& bufSegStr,
                        const geom::PrecisionModel *precisionModel);
                        // throw(GEOSException);

        void insertUniqueEdge(geomgraph::Edge *e);

        void createSubgraphs(geomgraph::PlanarGraph *graph,
                        std::vector<BufferSubgraph*>& list);

        void buildSubgraphs(const std::vector<BufferSubgraph*>& subgraphList,
                        overlay::PolygonBuilder& polyBuilder);

        //
        noding::Noder* getNoder(const geom::PrecisionModel* precisionModel);


        geom::Geometry* createEmptyResultGeometry() const;

public:
        BufferBuilder(const BufferParameters& nBufParams)
                :
                bufParams(nBufParams),
                workingPrecisionModel(NULL),
                li(NULL),
                intersectionAdder(NULL),
                workingNoder(NULL),
                geomFact(NULL),
                edgeList()
        {}

        ~BufferBuilder();


        void setWorkingPrecisionModel(const geom::PrecisionModel *pm) {
                workingPrecisionModel=pm;
        }

        void setNoder(noding::Noder* newNoder) { workingNoder = newNoder; }

        geom::Geometry* buffer(const geom::Geometry *g, double distance);
                // throw (GEOSException);

        geom::Geometry* bufferLineSingleSided( const geom::Geometry* g,
                                        double distance, bool leftSide ) ;
                // throw (GEOSException);

};

} // namespace geos::operation::buffer
} // namespace geos::operation
} // namespace geos

#endif // ndef GEOS_OP_BUFFER_BUFFERBUILDER_H

/**********************************************************************
 * $Log$
 * Revision 1.2  2006/03/14 16:08:21  strk
 * changed buildSubgraphs signature to use refs rather then pointers, made it const-correct. Reduced heap allocations in createSubgraphs()
 *
 * Revision 1.1  2006/03/14 00:19:40  strk
 * opBuffer.h split, streamlined headers in some (not all) files in operation/buffer/
 *
 **********************************************************************/

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