GEOS  3.4.2
LocationIndexedLine.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  *
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.
12  *
13  **********************************************************************
14  *
15  * Last port: linearref/LocationIndexedLine.java r466
16  *
17  **********************************************************************/
18 
19 #ifndef GEOS_LINEARREF_LOCATIONINDEXEDLINE_H
20 #define GEOS_LINEARREF_LOCATIONINDEXEDLINE_H
21 
22 #include <geos/export.h>
23 #include <geos/geom/Coordinate.h>
24 #include <geos/geom/Geometry.h>
25 #include <geos/geom/Lineal.h>
26 #include <geos/linearref/LinearLocation.h>
27 #include <geos/linearref/LocationIndexOfPoint.h>
28 #include <geos/linearref/LocationIndexOfLine.h>
29 #include <geos/util/IllegalArgumentException.h>
30 
31 namespace geos {
32 namespace linearref { // geos::linearref
33 
40 class GEOS_DLL LocationIndexedLine
41 {
42 private:
43  const geom::Geometry *linearGeom;
44 
45  void checkGeometryType()
46  {
47  if ( ! dynamic_cast<const geom::Lineal*>(linearGeom) )
48  throw util::IllegalArgumentException("Input geometry must be linear");
49  }
50 
51 public:
52 
61  : linearGeom(linearGeom)
62  {
63  checkGeometryType();
64  }
65 
80  {
81  return index.getCoordinate(linearGeom);
82  }
83 
84 
104  double offsetDistance) const
105  {
106  geom::Coordinate ret;
107  index.getSegment(linearGeom)->pointAlongOffset(
108  index.getSegmentFraction(), offsetDistance, ret
109  );
110  return ret;
111  }
112 
126  const LinearLocation& endIndex) const
127  {
128  return ExtractLineByLocation::extract(linearGeom, startIndex, endIndex);
129  }
130 
131 
148  {
149  return LocationIndexOfPoint::indexOf(linearGeom, pt);
150  }
151 
177  const LinearLocation& minIndex) const
178  {
179  return LocationIndexOfPoint::indexOfAfter(linearGeom, pt, &minIndex);
180  }
181 
193  LinearLocation* indicesOf(const geom::Geometry *subLine) const
194  {
195  return LocationIndexOfLine::indicesOf(linearGeom, subLine);
196  }
197 
198 
211  {
212  return LocationIndexOfPoint::indexOf(linearGeom, pt);
213  }
214 
222  {
223  return LinearLocation();
224  }
225 
233  {
234  return LinearLocation::getEndLocation(linearGeom);
235  }
236 
244  bool isValidIndex(const LinearLocation& index) const
245  {
246  return index.isValid(linearGeom);
247  }
248 
249 
258  {
259  LinearLocation loc = index;
260  loc.clamp(linearGeom);
261  return loc;
262  }
263 };
264 
265 } // geos::linearref
266 } // geos
267 #endif
static LinearLocation * indicesOf(const geom::Geometry *linearGeom, const geom::Geometry *subLine)
Determines the location of a subline along a linear Geometry.
LinearLocation indexOf(const geom::Coordinate &pt) const
Computes the index for a given point on the line.
Definition: LocationIndexedLine.h:147
LinearLocation indexOfAfter(const geom::Coordinate &pt, const LinearLocation &minIndex) const
Finds the index for a point on the line which is greater than the given index.
Definition: LocationIndexedLine.h:176
Coordinate is the lightweight class used to store coordinates.
Definition: Coordinate.h:60
static geom::Geometry * extract(const geom::Geometry *line, const LinearLocation &start, const LinearLocation &end)
LinearLocation getStartIndex() const
Returns the index of the start of the line.
Definition: LocationIndexedLine.h:221
double getSegmentFraction() const
geom::Coordinate getCoordinate(const geom::Geometry *linearGeom) const
LinearLocation * indicesOf(const geom::Geometry *subLine) const
Computes the indices for a subline of the line.
Definition: LocationIndexedLine.h:193
void clamp(const geom::Geometry *linear)
LocationIndexedLine(const geom::Geometry *linearGeom)
Constructs an object which allows linear referencing along a given linear Geometry.
Definition: LocationIndexedLine.h:60
Basic implementation of Geometry, constructed and destructed by GeometryFactory.
Definition: Geometry.h:167
Indicates one or more legal arguments.
Definition: IllegalArgumentException.h:34
Represents a location along a LineString or MultiLineString.
Definition: LinearLocation.h:43
std::auto_ptr< geom::LineSegment > getSegment(const geom::Geometry *linearGeom) const
bool isValidIndex(const LinearLocation &index) const
Tests whether an index is in the valid index range for the line.
Definition: LocationIndexedLine.h:244
geom::Geometry * extractLine(const LinearLocation &startIndex, const LinearLocation &endIndex) const
Computes the LineString for the interval on the line between the given indices.
Definition: LocationIndexedLine.h:125
geom::Coordinate extractPoint(const LinearLocation &index, double offsetDistance) const
Computes the Coordinate for the point on the line at the given index, offset by the given distance...
Definition: LocationIndexedLine.h:103
geom::Coordinate extractPoint(const LinearLocation &index) const
Computes the Coordinate for the point on the line at the given index.
Definition: LocationIndexedLine.h:79
LinearLocation clampIndex(const LinearLocation &index) const
Computes a valid index for this line by clamping the given index to the valid range of index values...
Definition: LocationIndexedLine.h:257
bool isValid(const geom::Geometry *linearGeom) const
static LinearLocation getEndLocation(const geom::Geometry *linear)
LinearLocation getEndIndex() const
Returns the index of the end of the line.
Definition: LocationIndexedLine.h:232
LinearLocation project(const geom::Coordinate &pt) const
Computes the index for the closest point on the line to the given point.
Definition: LocationIndexedLine.h:210
Supports linear referencing along a linear Geometry using LinearLocations as the index.
Definition: LocationIndexedLine.h:40