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LengthLocationMap.h
1 /**********************************************************************
2 * $Id: LengthLocationMap.h 2809 2009-12-06 01:05:24Z 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 * Last port: linearref/LengthLocationMap.java rev. 1.10
18 *
19 **********************************************************************/
20
21 #ifndef GEOS_LINEARREF_LENGTHLOCATIONMAP_H
22 #define GEOS_LINEARREF_LENGTHLOCATIONMAP_H
23
24 #include <geos/geom/Coordinate.h>
25 #include <geos/geom/Geometry.h>
26 #include <geos/linearref/LinearLocation.h>
27
28 namespace geos
29 {
30 namespace linearref // geos::linearref
31 {
32
39 class LengthLocationMap
40 {
41
42
43 private:
44 const geom::Geometry *linearGeom;
45
46 LinearLocation getLocationForward(double length) const;
47
48 public:
49
50 // TODO: cache computed cumulative length for each vertex
51 // TODO: support user-defined measures
52 // TODO: support measure index for fast mapping to a location
53
62 static LinearLocation getLocation(const geom::Geometry *linearGeom, double length);
63
72 static double getLength(const geom::Geometry *linearGeom, const LinearLocation& loc);
73
74 LengthLocationMap(const geom::Geometry *linearGeom);
75
84 LinearLocation getLocation(double length) const;
85
86 double getLength(const LinearLocation& loc) const;
87
88 };
89 }
90 }
91 #endif