Node.h

00001 /**********************************************************************
00002  * $Id: Node.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_IDX_QUADTREE_NODE_H
00017 #define GEOS_IDX_QUADTREE_NODE_H
00018 
00019 #include <geos/index/quadtree/NodeBase.h> // for inheritance
00020 #include <geos/geom/Coordinate.h> // for composition
00021 #include <geos/geom/Envelope.h> // for inline
00022 
00023 #include <string>
00024 
00025 // Forward declarations
00026 namespace geos {
00027         namespace geom {
00028                 //class Coordinate;
00029                 class Envelope;
00030         }
00031 }
00032 
00033 namespace geos {
00034 namespace index { // geos::index
00035 namespace quadtree { // geos::index::quadtree
00036 
00045 class Node: public NodeBase {
00046 
00047 private:
00048 
00049         geom::Envelope *env;
00050 
00051         geom::Coordinate centre;
00052 
00053         int level;
00054 
00055         Node* getSubnode(int index);
00056 
00057         Node* createSubnode(int index);
00058 
00059 protected:
00060 
00061         bool isSearchMatch(const geom::Envelope *searchEnv) {
00062                 return env->intersects(searchEnv);
00063         }
00064 
00065 public:
00066 
00067         static Node* createNode(geom::Envelope *env);
00068 
00069         static Node* createExpanded(Node *node,
00070                         const geom::Envelope *addEnv);
00071 
00072         // Takes ownership of envelope
00073         Node(geom::Envelope *nenv, int nlevel)
00074                 :
00075                 env(nenv),
00076                 centre((nenv->getMinX()+nenv->getMaxX())/2,
00077                         (nenv->getMinY()+nenv->getMaxY())/2),
00078                 level(nlevel)
00079         {
00080         }
00081 
00082         virtual ~Node() { delete env; }
00083 
00084         geom::Envelope* getEnvelope() { return env; }
00085 
00091         Node* getNode(const geom::Envelope *searchEnv);
00092 
00097         NodeBase* find(const geom::Envelope *searchEnv);
00098 
00099         void insertNode(Node *node);
00100 
00101         std::string toString() const;
00102 
00103 };
00104 
00105 } // namespace geos::index::quadtree
00106 } // namespace geos::index
00107 } // namespace geos
00108 
00109 #endif // GEOS_IDX_QUADTREE_NODE_H
00110 
00111 /**********************************************************************
00112  * $Log$
00113  * Revision 1.1  2006/03/22 12:22:50  strk
00114  * indexQuadtree.h split
00115  *
00116  **********************************************************************/
00117 

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