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MonotoneChainEdge.h
1 /**********************************************************************
2 * $Id: MonotoneChainEdge.h 3255 2011-03-01 17:56:10Z mloskot $
3 *
4 * GEOS - Geometry Engine Open Source
5 * http://geos.refractions.net
6 *
7 * Copyright (C) 2005-2006 Refractions Research Inc.
8 * Copyright (C) 2001-2002 Vivid Solutions Inc.
9 *
10 * This is free software; you can redistribute and/or modify it under
11 * the terms of the GNU Lesser General Public Licence as published
12 * by the Free Software Foundation.
13 * See the COPYING file for more information.
14 *
15 **********************************************************************/
16
17 #ifndef GEOS_GEOMGRAPH_INDEX_MONOTONECHAINEDGE_H
18 #define GEOS_GEOMGRAPH_INDEX_MONOTONECHAINEDGE_H
19
20 #include <geos/export.h>
21 #include <geos/geom/Envelope.h> // for composition
22
23 #ifdef _MSC_VER
24 #pragma warning(push)
25 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
26 #endif
27
28 // Forward declarations
29 namespace geos {
30 namespace geom {
31 class CoordinateSequence;
32 }
33 namespace geomgraph {
34 class Edge;
35 namespace index {
36 class SegmentIntersector;
37 }
38 }
39 }
40
41 namespace geos {
42 namespace geomgraph { // geos::geomgraph
43 namespace index { // geos::geomgraph::index
44
45 class GEOS_DLL MonotoneChainEdge {
46 public:
47 //MonotoneChainEdge();
48 ~MonotoneChainEdge();
49 MonotoneChainEdge(Edge *newE);
50 const geom::CoordinateSequence* getCoordinates();
51 std::vector<int>& getStartIndexes();
52 double getMinX(int chainIndex);
53 double getMaxX(int chainIndex);
54
55 void computeIntersects(const MonotoneChainEdge &mce,
56 SegmentIntersector &si);
57
58 void computeIntersectsForChain(int chainIndex0,
59 const MonotoneChainEdge &mce, int chainIndex1,
60 SegmentIntersector &si);
61
62 protected:
63 Edge *e;
64 const geom::CoordinateSequence* pts; // cache a reference to the coord array, for efficiency
65 // the lists of start/end indexes of the monotone chains.
66 // Includes the end point of the edge as a sentinel
67 std::vector<int> startIndex;
68 // these envelopes are created once and reused
69 geom::Envelope env1;
70 geom::Envelope env2;
71 private:
72 void computeIntersectsForChain(int start0, int end0,
73 const MonotoneChainEdge &mce,
74 int start1, int end1,
75 SegmentIntersector &ei);
76 };
77
78 } // namespace geos.geomgraph.index
79 } // namespace geos.geomgraph
80 } // namespace geos
81
82 #ifdef _MSC_VER
83 #pragma warning(pop)
84 #endif
85
86 #endif
87
88 /**********************************************************************
89 * $Log$
90 * Revision 1.1 2006/03/14 12:55:55 strk
91 * Headers split: geomgraphindex.h, nodingSnapround.h
92 *
93 **********************************************************************/
94