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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