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Key.h

00001 /**********************************************************************
00002  * $Id: Key.h 2556 2009-06-06 22:22:28Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2009  Sandro Santilli <strk@keybit.net>
00008  * Copyright (C) 2006 Refractions Research Inc.
00009  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00010  *
00011  * This is free software; you can redistribute and/or modify it under
00012  * the terms of the GNU Lesser General Public Licence as published
00013  * by the Free Software Foundation. 
00014  * See the COPYING file for more information.
00015  *
00016  **********************************************************************
00017  *
00018  * Last port: index/quadtree/Key.java rev 1.8 (JTS-1.10)
00019  *
00020  **********************************************************************/
00021 
00022 #ifndef GEOS_IDX_QUADTREE_KEY_H
00023 #define GEOS_IDX_QUADTREE_KEY_H
00024 
00025 #include <geos/export.h>
00026 #include <geos/geom/Coordinate.h> // for composition
00027 #include <geos/geom/Envelope.h> // for composition
00028 
00029 // Forward declarations
00030 // ...
00031 
00032 namespace geos {
00033 namespace index { // geos::index
00034 namespace quadtree { // geos::index::quadtree
00035 
00043 class GEOS_DLL Key {
00044 public:
00045 
00046         // Doesn't touch the Envelope, might as well be const
00047         static int computeQuadLevel(const geom::Envelope& env);
00048 
00049         // Reference to argument won't be used after construction
00050         Key(const geom::Envelope& itemEnv);
00051 
00052         // used to be virtual, but I don't see subclasses...
00053         ~Key();
00054 
00056         const geom::Coordinate& getPoint() const;
00057 
00058         int getLevel() const;
00059 
00061         const geom::Envelope& getEnvelope() const;
00062 
00064         geom::Coordinate* getCentre() const;
00065 
00070         void computeKey(const geom::Envelope& itemEnv);
00071 
00072 private:        
00073         // the fields which make up the key
00074 
00075         // Owned by this class
00076         geom::Coordinate pt;
00077 
00078         int level;
00079 
00080         // auxiliary data which is derived from the key for use in computation
00081         geom::Envelope env;
00082 
00083         void computeKey(int level, const geom::Envelope& itemEnv);
00084 };
00085 
00086 } // namespace geos::index::quadtree
00087 } // namespace geos::index
00088 } // namespace geos
00089 
00090 #endif // GEOS_IDX_QUADTREE_KEY_H
00091 
00092 /**********************************************************************
00093  * $Log$
00094  * Revision 1.1  2006/03/22 12:22:50  strk
00095  * indexQuadtree.h split
00096  *
00097  **********************************************************************/
00098 

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