PointBuilder.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/PointBuilder.java rev. 1.16 (JTS-1.10)
 *
 **********************************************************************/
 
#ifndef GEOS_OP_OVERLAY_POINTBUILDER_H
#define GEOS_OP_OVERLAY_POINTBUILDER_H
 
#include <geos/export.h>
 
#include <geos/geom/GeometryFactory.h> // for inlines
#include <geos/operation/overlay/OverlayOp.h> // for OpCode enum
#include <geos/util.h>
 
#include <vector>
 
// Forward declarations
namespace geos {
        namespace geom {
                class GeometryFactory;
                class Point;
        }
        namespace geomgraph {
                class Node;
        }
        namespace algorithm {
                class PointLocator;
        }
        namespace operation {
                namespace overlay {
                        class OverlayOp;
                }
        }
}
 
namespace geos {
namespace operation { // geos::operation
namespace overlay { // geos::operation::overlay

class GEOS_DLL PointBuilder {
private:
 
        OverlayOp *op;
        const geom::GeometryFactory *geometryFactory;
        void extractNonCoveredResultNodes(OverlayOp::OpCode opCode);
 
        /*
         * Converts non-covered nodes to Point objects and adds them to
         * the result.
         *
         * A node is covered if it is contained in another element Geometry
         * with higher dimension (e.g. a node point might be contained in
         * a polygon, in which case the point can be eliminated from
         * the result).
         *
         * @param n the node to test
         */
        void filterCoveredNodeToPoint(const geomgraph::Node *);

        std::vector<geom::Point*> *resultPointList;
 
public:
 
        PointBuilder(OverlayOp *newOp,
                        const geom::GeometryFactory *newGeometryFactory,
                        algorithm::PointLocator *newPtLocator=NULL)
                :
                op(newOp),
                geometryFactory(newGeometryFactory),
                resultPointList(new std::vector<geom::Point *>())
        {
        ::geos::ignore_unused_variable_warning(newPtLocator);
    }

        std::vector<geom::Point*>* build(OverlayOp::OpCode opCode);
};
 
 
} // namespace geos::operation::overlay
} // namespace geos::operation
} // namespace geos
 
#endif // ndef GEOS_OP_OVERLAY_POINTBUILDER_H