Node.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2006 Refractions Research Inc.
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: index/quadtree/Node.java rev 1.8 (JTS-1.10)
00016  *
00017  **********************************************************************/
00018 
00019 #ifndef GEOS_IDX_QUADTREE_NODE_H
00020 #define GEOS_IDX_QUADTREE_NODE_H
00021 
00022 #include <geos/export.h>
00023 #include <geos/index/quadtree/NodeBase.h> // for inheritance
00024 #include <geos/geom/Coordinate.h> // for composition
00025 #include <geos/geom/Envelope.h> // for inline
00026 
00027 #include <string>
00028 #include <memory>
00029 
00030 #ifdef _MSC_VER
00031 #pragma warning(push)
00032 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
00033 #endif
00034 
00035 // Forward declarations
00036 namespace geos {
00037         namespace geom {
00038                 //class Coordinate;
00039                 class Envelope;
00040         }
00041 }
00042 
00043 namespace geos {
00044 namespace index { // geos::index
00045 namespace quadtree { // geos::index::quadtree
00046 
00055 class GEOS_DLL Node: public NodeBase {
00056 
00057 private:
00058 
00060         std::auto_ptr<geom::Envelope> env;
00061 
00062         geom::Coordinate centre;
00063 
00064         int level;
00065 
00072         Node* getSubnode(int index);
00073 
00074         std::auto_ptr<Node> createSubnode(int index);
00075 
00076 protected:
00077 
00078         bool isSearchMatch(const geom::Envelope& searchEnv) const {
00079                 return env->intersects(searchEnv);
00080         }
00081 
00082 public:
00083 
00084         // Create a node computing level from given envelope
00085         static std::auto_ptr<Node> createNode(const geom::Envelope& env);
00086 
00088         //
00092         static std::auto_ptr<Node> createExpanded(std::auto_ptr<Node> node,
00093                         const geom::Envelope& addEnv);
00094 
00095         Node(std::auto_ptr<geom::Envelope> nenv, int nlevel)
00096                 :
00097                 env(nenv),
00098                 centre((env->getMinX()+env->getMaxX())/2,
00099                         (env->getMinY()+env->getMaxY())/2),
00100                 level(nlevel)
00101         {
00102         }
00103 
00104         virtual ~Node() {}
00105 
00108         geom::Envelope* getEnvelope() { return env.get(); }
00109 
00115         Node* getNode(const geom::Envelope *searchEnv);
00116 
00121         NodeBase* find(const geom::Envelope *searchEnv);
00122 
00123         void insertNode(std::auto_ptr<Node> node);
00124 
00125         std::string toString() const;
00126 
00127 };
00128 
00129 } // namespace geos::index::quadtree
00130 } // namespace geos::index
00131 } // namespace geos
00132 
00133 #ifdef _MSC_VER
00134 #pragma warning(pop)
00135 #endif
00136 
00137 #endif // GEOS_IDX_QUADTREE_NODE_H

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