CascadedUnion.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://trac.osgeo.org/geos
00005  *
00006  * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
00007  *
00008  * This is free software; you can redistribute and/or modify it under
00009  * the terms of the GNU Lesser General Public Licence as published
00010  * by the Free Software Foundation. 
00011  * See the COPYING file for more information.
00012  *
00013  **********************************************************************
00014  *
00015  * Last port: ORIGINAL WORK, generalization of CascadedPolygonUnion
00016  *
00017  **********************************************************************/
00018 
00019 #ifndef GEOS_OP_UNION_CASCADEDUNION_H
00020 #define GEOS_OP_UNION_CASCADEDUNION_H
00021 
00022 #include <geos/export.h>
00023 
00024 #include <vector>
00025 #include <algorithm>
00026 
00027 #include "GeometryListHolder.h"
00028 
00029 // Forward declarations
00030 namespace geos {
00031     namespace geom {
00032         class GeometryFactory;
00033         class Geometry;
00034         class Geometry;
00035         class Envelope;
00036     }
00037     namespace index {
00038         namespace strtree {
00039             class ItemsList;
00040         }
00041     }
00042 }
00043 
00044 namespace geos {
00045 namespace operation { // geos::operation
00046 namespace geounion {  // geos::operation::geounion
00047 
00055 class GEOS_DLL CascadedUnion 
00056 {
00057 private:
00058     const std::vector<geom::Geometry*>* inputGeoms;
00059     geom::GeometryFactory const* geomFactory;
00060 
00068     static int const STRTREE_NODE_CAPACITY = 4;
00069 
00070 public:
00071     CascadedUnion();
00072 
00079     static geom::Geometry* Union(std::vector<geom::Geometry*>* geoms);
00080 
00088     template <class T>
00089     static geom::Geometry* Union(T start, T end)
00090     {
00091       std::vector<geom::Geometry*> polys;
00092       for (T i=start; i!=end; ++i) {
00093         const geom::Geometry* p = dynamic_cast<const geom::Geometry*>(*i);
00094         polys.push_back(const_cast<geom::Geometry*>(p));
00095       }
00096       return Union(&polys);
00097     }
00098 
00106     CascadedUnion(const std::vector<geom::Geometry*>* geoms)
00107       : inputGeoms(geoms),
00108         geomFactory(NULL)
00109     {}
00110 
00117     geom::Geometry* Union();
00118 
00119 private:
00120     geom::Geometry* unionTree(index::strtree::ItemsList* geomTree);
00121 
00127     geom::Geometry* binaryUnion(GeometryListHolder* geoms);
00128 
00138     geom::Geometry* binaryUnion(GeometryListHolder* geoms, std::size_t start, 
00139         std::size_t end);
00140 
00148     GeometryListHolder* reduceToGeometries(index::strtree::ItemsList* geomTree);
00149 
00159     geom::Geometry* unionSafe(geom::Geometry* g0, geom::Geometry* g1);
00160 
00161     geom::Geometry* unionOptimized(geom::Geometry* g0, geom::Geometry* g1);
00162 
00179     geom::Geometry* unionUsingEnvelopeIntersection(geom::Geometry* g0, 
00180         geom::Geometry* g1, geom::Envelope const& common);
00181 
00182     geom::Geometry* extractByEnvelope(geom::Envelope const& env, 
00183         geom::Geometry* geom, std::vector<geom::Geometry*>& disjointGeoms);
00184 
00192     static geom::Geometry* unionActual(geom::Geometry* g0, geom::Geometry* g1);
00193 };
00194 
00195 } // namespace geos::operation::union
00196 } // namespace geos::operation
00197 } // namespace geos
00198 
00199 #endif

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