LineBuilder.h

/**********************************************************************
 *
 * GEOS - Geometry Engine Open Source
 * http://geos.osgeo.org
 *
 * Copyright (C) 2006 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/overlay/LineBuilder.java rev. 1.15 (JTS-1.10)
 *
 **********************************************************************/
 
#ifndef GEOS_OP_OVERLAY_LINEBUILDER_H
#define GEOS_OP_OVERLAY_LINEBUILDER_H
 
#include <geos/export.h>
 
#include <geos/operation/overlay/OverlayOp.h> // for OverlayOp::OpCode enum 
 
#include <vector>
 
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
#endif
 
// Forward declarations
namespace geos {
        namespace geom {
                class GeometryFactory;
                class CoordinateSequence;
                class LineString;
        }
        namespace geomgraph {
                class DirectedEdge;
                class Edge;
        }
        namespace algorithm {
                class PointLocator;
        }
        namespace operation {
                namespace overlay {
                        class OverlayOp;
                }
        }
}
 
namespace geos {
namespace operation { // geos::operation
namespace overlay { // geos::operation::overlay

class GEOS_DLL LineBuilder {
 
public:
 
        LineBuilder(OverlayOp *newOp,
                        const geom::GeometryFactory *newGeometryFactory,
                        algorithm::PointLocator *newPtLocator);
 
        ~LineBuilder();

        std::vector<geom::LineString*>* build(OverlayOp::OpCode opCode);

        void collectLineEdge(geomgraph::DirectedEdge *de,
                        OverlayOp::OpCode opCode,
                        std::vector<geomgraph::Edge*>* edges);
 
private:
        OverlayOp *op;
        const geom::GeometryFactory *geometryFactory;
        algorithm::PointLocator *ptLocator;
        std::vector<geomgraph::Edge*> lineEdgesList;
        std::vector<geom::LineString*>* resultLineList;
        void findCoveredLineEdges();
        void collectLines(OverlayOp::OpCode opCode);
        void buildLines(OverlayOp::OpCode opCode);
        void labelIsolatedLines(std::vector<geomgraph::Edge*> *edgesList);

        void collectBoundaryTouchEdge(geomgraph::DirectedEdge *de,
                        OverlayOp::OpCode opCode,
                        std::vector<geomgraph::Edge*>* edges);

        void labelIsolatedLine(geomgraph::Edge *e, int targetIndex);
 
        /*
         * If the given CoordinateSequence has mixed 3d/2d vertexes
         * set Z for all vertexes missing it.
         * The Z value is interpolated between 3d vertexes and copied
         * from a 3d vertex to the end.
         */
        void propagateZ(geom::CoordinateSequence *cs);
};
 
} // namespace geos::operation::overlay
} // namespace geos::operation
} // namespace geos
 
#ifdef _MSC_VER
#pragma warning(pop)
#endif
 
#endif // ndef GEOS_OP_OVERLAY_LINEBUILDER_H