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LengthLocationMap.h
1 /**********************************************************************
2 *
3 * GEOS - Geometry Engine Open Source
4 * http://geos.osgeo.org
5 *
6 * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
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 r463
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 namespace linearref { // geos::linearref
30
37 class LengthLocationMap
38 {
39
40
41 private:
42 const geom::Geometry *linearGeom;
43
44 LinearLocation getLocationForward(double length) const;
45
46 LinearLocation resolveHigher(const LinearLocation& loc) 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
63 static LinearLocation getLocation(const geom::Geometry *linearGeom, double length)
64 {
65 LengthLocationMap locater(linearGeom);
66 return locater.getLocation(length);
67 }
68
80 static LinearLocation getLocation(const geom::Geometry *linearGeom, double length, bool resolveLower)
81 {
82 LengthLocationMap locater(linearGeom);
83 return locater.getLocation(length, resolveLower);
84 }
85
94 static double getLength(const geom::Geometry *linearGeom, const LinearLocation& loc);
95
96 LengthLocationMap(const geom::Geometry *linearGeom);
97
110 LinearLocation getLocation(double length, bool resolveLower) const;
111
123 LinearLocation getLocation(double length) const;
124
125 double getLength(const LinearLocation& loc) const;
126
127 };
128
129 } // geos.linearref
130 } // geos
131
132 #endif