PointBuilder.h

00001 /**********************************************************************
00002  * $Id: PointBuilder.h 1820 2006-09-06 16:54:23Z mloskot $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2006 Refractions Research Inc.
00008  *
00009  * This is free software; you can redistribute and/or modify it under
00010  * the terms of the GNU Lesser General Public Licence as published
00011  * by the Free Software Foundation. 
00012  * See the COPYING file for more information.
00013  *
00014  **********************************************************************/
00015 
00016 #ifndef GEOS_OP_OVERLAY_POINTBUILDER_H
00017 #define GEOS_OP_OVERLAY_POINTBUILDER_H
00018 
00019 #include <geos/geom/GeometryFactory.h> // for inlines
00020 #include <geos/operation/overlay/OverlayOp.h> // for OpCode enum
00021 
00022 #include <vector>
00023 
00024 // Forward declarations
00025 namespace geos {
00026         namespace geom {
00027                 class GeometryFactory;
00028                 class Point;
00029         }
00030         namespace geomgraph {
00031                 class Node;
00032         }
00033         namespace algorithm {
00034                 class PointLocator;
00035         }
00036         namespace operation {
00037                 namespace overlay {
00038                         class OverlayOp;
00039                 }
00040         }
00041 }
00042 
00043 namespace geos {
00044 namespace operation { // geos::operation
00045 namespace overlay { // geos::operation::overlay
00046 
00050 class PointBuilder {
00051 private:
00052 
00053         OverlayOp *op;
00054         const geom::GeometryFactory *geometryFactory;
00055         void extractNonCoveredResultNodes(OverlayOp::OpCode opCode);
00056 
00057         /*
00058          * Converts non-covered nodes to Point objects and adds them to
00059          * the result.
00060          *
00061          * A node is covered if it is contained in another element Geometry
00062          * with higher dimension (e.g. a node point might be contained in
00063          * a polygon, in which case the point can be eliminated from
00064          * the result).
00065          *
00066          * @param n the node to test
00067          */
00068         void filterCoveredNodeToPoint(const geomgraph::Node *);
00069 
00073         std::vector<geom::Point*> *resultPointList;
00074 
00075 public:
00076 
00077         PointBuilder(OverlayOp *newOp,
00078                         const geom::GeometryFactory *newGeometryFactory,
00079                         algorithm::PointLocator *newPtLocator=NULL)
00080                 :
00081                 op(newOp),
00082                 geometryFactory(newGeometryFactory),
00083                 resultPointList(new std::vector<geom::Point *>())
00084         {}
00085 
00090         std::vector<geom::Point*>* build(OverlayOp::OpCode opCode);
00091 };
00092 
00093 
00094 } // namespace geos::operation::overlay
00095 } // namespace geos::operation
00096 } // namespace geos
00097 
00098 #endif // ndef GEOS_OP_OVERLAY_POINTBUILDER_H
00099 
00100 /**********************************************************************
00101  * $Log$
00102  * Revision 1.2  2006/06/05 15:36:34  strk
00103  * Given OverlayOp funx code enum a name and renamed values to have a lowercase prefix. Drop all of noding headers from installed header set.
00104  *
00105  * Revision 1.1  2006/03/17 13:24:59  strk
00106  * opOverlay.h header splitted. Reduced header inclusions in operation/overlay implementation files. ElevationMatrixFilter code moved from own file to ElevationMatrix.cpp (ideally a class-private).
00107  *
00108  **********************************************************************/
00109 

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