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# OverlayOp.h

    00001 /**********************************************************************
    00002  * $Id: OverlayOp.h 2557 2009-06-08 09:30:55Z strk $
    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  * Last port: operation/overlay/OverlayOp.java rev. 1.31 (JTS-1.10)
    00017  *
    00018  **********************************************************************/
    00019
    00020 #ifndef GEOS_OP_OVERLAY_OVERLAYOP_H
    00021 #define GEOS_OP_OVERLAY_OVERLAYOP_H
    00022
    00023 #include <geos/export.h>
    00024
    00025 #include <geos/operation/GeometryGraphOperation.h> // for inheritance
    00026 #include <geos/geomgraph/EdgeList.h> // for composition
    00027 #include <geos/algorithm/PointLocator.h> // for composition
    00028 #include <geos/geomgraph/PlanarGraph.h> // for inline (GeometryGraph->PlanarGraph)
    00029
    00030 #include <vector>
    00031
    00032 // Forward declarations
    00033 namespace geos {
    00034         namespace geom {
    00035                 class Geometry;
    00036                 class Coordinate;
    00037                 class GeometryFactory;
    00038                 class Polygon;
    00039                 class LineString;
    00040                 class Point;
    00041         }
    00042         namespace geomgraph {
    00043                 class Label;
    00044                 class Edge;
    00045                 class Node;
    00046         }
    00047         namespace operation {
    00048                 namespace overlay {
    00049                         class ElevationMatrix;
    00050                 }
    00051         }
    00052 }
    00053
    00054 namespace geos {
    00055 namespace operation { // geos::operation
    00056 namespace overlay { // geos::operation::overlay
    00057
    00059 //
    00063 class GEOS_DLL OverlayOp: public GeometryGraphOperation {
    00064
    00065 public:
    00066
    00068         //
    00072         enum OpCode {
    00073                 opINTERSECTION=1,
    00074                 opUNION,
    00075                 opDIFFERENCE,
    00076                 opSYMDIFFERENCE
    00077         };
    00078
    00079         static geom::Geometry* overlayOp(const geom::Geometry *geom0,
    00080                         const geom::Geometry *geom1,
    00081                         OpCode opCode);
    00082                 //throw(TopologyException *);
    00083
    00084         static bool isResultOfOp(geomgraph::Label *label, OpCode opCode);
    00085
    00087         //
    00090         static bool isResultOfOp(int loc0, int loc1, OpCode opCode);
    00091
    00093         //
    00097         OverlayOp(const geom::Geometry *g0, const geom::Geometry *g1);
    00098
    00099         virtual ~OverlayOp(); // FIXME: virtual ?
    00100
    00101         geom::Geometry* getResultGeometry(OpCode funcCode);
    00102                 // throw(TopologyException *);
    00103
    00104         geomgraph::PlanarGraph& getGraph() { return graph; }
    00105
    00113         bool isCoveredByLA(const geom::Coordinate& coord);
    00114
    00121         bool isCoveredByA(const geom::Coordinate& coord);
    00122
    00123         /*
    00124          * @return true if the coord is located in the interior or boundary of
    00125          * a geometry in the list.
    00126          */
    00127
    00128 protected:
    00129
    00138         void insertUniqueEdge(geomgraph::Edge *e);
    00139
    00140 private:
    00141
    00142         algorithm::PointLocator ptLocator;
    00143
    00144         const geom::GeometryFactory *geomFact;
    00145
    00146         geom::Geometry *resultGeom;
    00147
    00148         geomgraph::PlanarGraph graph;
    00149
    00150         geomgraph::EdgeList edgeList;
    00151
    00152         std::vector<geom::Polygon*> *resultPolyList;
    00153
    00154         std::vector<geom::LineString*> *resultLineList;
    00155
    00156         std::vector<geom::Point*> *resultPointList;
    00157
    00158         void computeOverlay(OpCode opCode); // throw(TopologyException *);
    00159
    00160         void insertUniqueEdges(std::vector<geomgraph::Edge*> *edges);
    00161
    00162         /*
    00163          * If either of the GeometryLocations for the existing label is
    00164          * exactly opposite to the one in the labelToMerge,
    00165          * this indicates a dimensional collapse has happened.
    00166          * In this case, convert the label for that Geometry to a Line label
    00167          */
    00168         //Not needed
    00169         //void checkDimensionalCollapse(geomgraph::Label labelToMerge, geomgraph::Label existingLabel);
    00170
    00182         void computeLabelsFromDepths();
    00183
    00188         void replaceCollapsedEdges();
    00189
    00200         void copyPoints(int argIndex);
    00201
    00210         void computeLabelling(); // throw(TopologyException *);
    00211
    00219         void mergeSymLabels();
    00220
    00221         void updateNodeLabelling();
    00222
    00240         void labelIncompleteNodes();
    00241
    00245         void labelIncompleteNode(geomgraph::Node *n, int targetIndex);
    00246
    00258         void findResultAreaEdges(OpCode opCode);
    00259
    00264         void cancelDuplicateResultEdges();
    00265
    00270         bool isCovered(const geom::Coordinate& coord,
    00271                         std::vector<geom::Geometry*> *geomList);
    00272
    00277         bool isCovered(const geom::Coordinate& coord,
    00278                         std::vector<geom::Polygon*> *geomList);
    00279
    00284         bool isCovered(const geom::Coordinate& coord,
    00285                         std::vector<geom::LineString*> *geomList);
    00286
    00291         geom::Geometry* computeGeometry(
    00292                         std::vector<geom::Point*> *nResultPointList,
    00293                         std::vector<geom::LineString*> *nResultLineList,
    00294                         std::vector<geom::Polygon*> *nResultPolyList);
    00295
    00297         std::vector<geomgraph::Edge *>dupEdges;
    00298
    00303         int mergeZ(geomgraph::Node *n, const geom::Polygon *poly) const;
    00304
    00310         int mergeZ(geomgraph::Node *n, const geom::LineString *line) const;
    00311
    00315         double avgz[2];
    00316         bool avgzcomputed[2];
    00317
    00318         double getAverageZ(int targetIndex);
    00319         static double getAverageZ(const geom::Polygon *poly);
    00320
    00321         ElevationMatrix *elevationMatrix;
    00322
    00325         void checkObviouslyWrongResult(OpCode opCode);
    00326
    00327 };
    00328
    00332 struct overlayOp {
    00333
    00334         OverlayOp::OpCode opCode;
    00335
    00336         overlayOp(OverlayOp::OpCode code)
    00337                 :
    00338                 opCode(code)
    00339         {}
    00340
    00341         geom::Geometry* operator() (const geom::Geometry* g0,
    00342                         const geom::Geometry* g1)
    00343         {
    00344                 return OverlayOp::overlayOp(g0, g1, opCode);
    00345         }
    00346
    00347 };
    00348
    00349 } // namespace geos::operation::overlay
    00350 } // namespace geos::operation
    00351 } // namespace geos
    00352
    00353 #endif // ndef GEOS_OP_OVERLAY_OVERLAYOP_H
    00354
    00355 /**********************************************************************
    00356  * $Log$
    00357  * Revision 1.6  2006/07/05 20:19:29  strk
    00358  * added checks for obviously wrong result of difference and intersection ops
    00359  *
    00360  * Revision 1.5  2006/06/05 15:36:34  strk
    00361  * Given OverlayOp funx code enum a name and renamed values to have a lowercase prefix. Drop all of noding headers from installed header set.
    00362  *
    00363  * Revision 1.4  2006/05/24 15:17:44  strk
    00364  * Reduced number of installed headers in geos/operation/ subdir
    00365  *
    00366  * Revision 1.3  2006/04/14 15:04:36  strk
    00367  * fixed missing namespace qualification in overlay::overlayOp
    00368  *
    00369  * Revision 1.2  2006/04/14 14:35:47  strk
    00370  * Added overlayOp() adapter for use in templates expecting binary ops
    00371  *
    00372  * Revision 1.1  2006/03/17 13:24:59  strk
    00373  * 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).
    00374  *
    00375  **********************************************************************/
    00376