GEOS  3.4.2
MonotoneChainSelectAction.h
1 /**********************************************************************
2  *
3  * GEOS - Geometry Engine Open Source
4  * http://geos.osgeo.org
5  *
6  * Copyright (C) 2001-2002 Vivid Solutions Inc.
7  *
8  * This is free software; you can redistribute and/or modify it under
9  * the terms of the GNU Lesser General Public Licence as published
10  * by the Free Software Foundation.
11  * See the COPYING file for more information.
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13  **********************************************************************
14  *
15  * Last port: index/chain/MonotoneChainSelectAction.java rev. 1.6 (JTS-1.10)
16  *
17  **********************************************************************/
18 
19 #ifndef GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
20 #define GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
21 
22 #include <geos/export.h>
23 #include <geos/geom/LineSegment.h> // composition
24 #include <geos/geom/Envelope.h> // composition
25 
26 
27 // Forward declarations
28 namespace geos {
29  namespace index {
30  namespace chain {
31  class MonotoneChain;
32  }
33  }
34 }
35 
36 namespace geos {
37 namespace index { // geos::index
38 namespace chain { // geos::index::chain
39 
45 class GEOS_DLL MonotoneChainSelectAction {
46 
47 protected:
48 
49  geom::LineSegment selectedSegment;
50 
51 public:
52 
54 
55  virtual ~MonotoneChainSelectAction() {}
56 
58  virtual void select(MonotoneChain& mc, unsigned int start);
59 
66  virtual void select(const geom::LineSegment& seg) = 0;
67 
68  // these envelopes are used during the MonotoneChain search process
69  // should only be visible by classes in this package
70  geom::Envelope tempEnv1;
71 };
72 
73 
74 } // namespace geos::index::chain
75 } // namespace geos::index
76 } // namespace geos
77 
78 #endif // GEOS_IDX_CHAIN_MONOTONECHAINSELECTACTION_H
79 
Definition: LineSegment.h:57
An Envelope defines a rectangulare region of the 2D coordinate plane.
Definition: Envelope.h:53
Definition: MonotoneChainSelectAction.h:45
Monotone Chains are a way of partitioning the segments of a linestring to allow for fast searching of...
Definition: index/chain/MonotoneChain.h:85