VoronoiDiagramBuilder.h

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/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2012 Excensus LLC.
 *
 * This is free software; you can redistribute and/or modify it under
 * the terms of the GNU Lesser General Licence as published
 * by the Free Software Foundation.
 * See the COPYING file for more information.
 *
 **********************************************************************
 *
 * Last port: triangulate/VoronoiDiagramBuilder.java r524
 *
 **********************************************************************/

#ifndef GEOS_TRIANGULATE_VORONOIDIAGRAMBUILDER_H
#define GEOS_TRIANGULATE_VORONOIDIAGRAMBUILDER_H

#include <geos/triangulate/quadedge/QuadEdgeSubdivision.h>
#include <geos/geom/Envelope.h> // for composition
#include <memory>
#include <iostream>

namespace geos {
namespace geom {
class Geometry;
class CoordinateSequence;
class GeometryCollection;
class GeometryFactory;
}
namespace triangulate { //geos.triangulate

class GEOS_DLL VoronoiDiagramBuilder {
public:
    VoronoiDiagramBuilder();

    ~VoronoiDiagramBuilder() = default;

    void setSites(const geom::Geometry& geom);

    void setSites(const geom::CoordinateSequence& coords);

    void setClipEnvelope(const geom::Envelope* clipEnv);

    void setTolerance(double tolerance);

    std::unique_ptr<quadedge::QuadEdgeSubdivision> getSubdivision();

    std::unique_ptr<geom::GeometryCollection> getDiagram(const geom::GeometryFactory& geomFact);

    std::unique_ptr<geom::Geometry> getDiagramEdges(const geom::GeometryFactory& geomFact);

private:

    std::unique_ptr<geom::CoordinateSequence> siteCoords;
    double tolerance;
    std::unique_ptr<quadedge::QuadEdgeSubdivision> subdiv;
    const geom::Envelope* clipEnv; // externally owned
    geom::Envelope diagramEnv;

    void create();

    static std::unique_ptr<geom::GeometryCollection>
    clipGeometryCollection(std::vector<std::unique_ptr<geom::Geometry>> & geoms, const geom::Envelope& clipEnv);

};

} //namespace geos.triangulate
} //namespace geos

#endif //GEOS_TRIANGULATE_VORONOIDIAGRAMBUILDER_H