MonotoneChainSelectAction.h

00001 /**********************************************************************
00002  *
00003  * GEOS - Geometry Engine Open Source
00004  * http://geos.osgeo.org
00005  *
00006  * Copyright (C) 2001-2002 Vivid Solutions 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/chain/MonotoneChainSelectAction.java rev. 1.6 (JTS-1.10)
00016  *
00017  **********************************************************************/
00018 
00019 #ifndef GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
00020 #define GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
00021 
00022 #include <geos/export.h>
00023 #include <geos/geom/LineSegment.h> // composition
00024 #include <geos/geom/Envelope.h> // composition
00025 
00026 
00027 // Forward declarations
00028 namespace geos {
00029         namespace index { 
00030                 namespace chain { 
00031                         class MonotoneChain;
00032                 }
00033         }
00034 }
00035 
00036 namespace geos {
00037 namespace index { // geos::index
00038 namespace chain { // geos::index::chain
00039 
00045 class GEOS_DLL MonotoneChainSelectAction {
00046 
00047 protected:
00048 
00049         geom::LineSegment selectedSegment;
00050 
00051 public:
00052 
00053         MonotoneChainSelectAction() {}
00054 
00055         virtual ~MonotoneChainSelectAction() {}
00056 
00058         virtual void select(MonotoneChain& mc, unsigned int start);
00059 
00066         virtual void select(const geom::LineSegment& seg) = 0;
00067 
00068         // these envelopes are used during the MonotoneChain search process
00069         // should only be visible by classes in this package
00070         geom::Envelope tempEnv1;
00071 };
00072 
00073 
00074 } // namespace geos::index::chain
00075 } // namespace geos::index
00076 } // namespace geos
00077 
00078 #endif // GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
00079 

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