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LinearLocation.h

00001 /**********************************************************************
00002  * $Id: LinearLocation.h 2809 2009-12-06 01:05:24Z mloskot $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2005-2006 Refractions Research Inc.
00008  * Copyright (C) 2001-2002 Vivid Solutions Inc.
00009  *
00010  * This is free software; you can redistribute and/or modify it under
00011  * the terms of the GNU Lesser General Public Licence as published
00012  * by the Free Software Foundation.
00013  * See the COPYING file for more information.
00014  *
00015  **********************************************************************
00016  *
00017  * Last port: linearref/LinearLocation.java rev. 1.10
00018  *
00019  **********************************************************************/
00020 
00021 #ifndef GEOS_LINEARREF_LINEARLOCATION_H
00022 #define GEOS_LINEARREF_LINEARLOCATION_H
00023 
00024 #include <string>
00025 #include <memory> // for std::auto_ptr
00026 
00027 #include <geos/geom/Coordinate.h>
00028 #include <geos/geom/Geometry.h>
00029 #include <geos/geom/LineSegment.h>
00030 
00031 namespace geos {
00032 namespace linearref { // geos::linearref
00033 
00034 
00043 class LinearLocation
00044 {
00045 private:
00046         unsigned int componentIndex;
00047         unsigned int segmentIndex;
00048         double segmentFraction;
00049 
00057         void normalize();
00058 
00059 public:
00065         static LinearLocation getEndLocation(const geom::Geometry* linear);
00066 
00082         static geom::Coordinate pointAlongSegmentByFraction(const geom::Coordinate& p0, const geom::Coordinate& p1, double frac);
00083 
00084 
00088         LinearLocation(unsigned int segmentIndex = 0, double segmentFraction = 0.0);
00089 
00090         LinearLocation(unsigned int componentIndex, unsigned int segmentIndex, double segmentFraction);
00091 
00097         void clamp(const geom::Geometry* linear);
00098 
00107         void snapToVertex(const geom::Geometry* linearGeom, double minDistance);
00108 
00116         double getSegmentLength(const geom::Geometry* linearGeom) const;
00117 
00124         void setToEnd(const geom::Geometry* linear);
00125 
00131         unsigned int getComponentIndex() const;
00132 
00138         unsigned int getSegmentIndex() const;
00139 
00145         double getSegmentFraction() const;
00146 
00152         bool isVertex() const;
00153 
00162         geom::Coordinate getCoordinate(const geom::Geometry* linearGeom) const;
00163 
00171         std::auto_ptr<geom::LineSegment> getSegment(const geom::Geometry* linearGeom) const;
00172 
00180         bool isValid(const geom::Geometry* linearGeom) const;
00181 
00190         int compareTo(const LinearLocation& other) const;
00191 
00201         int compareLocationValues(unsigned int componentIndex1, unsigned int segmentIndex1, double segmentFraction1) const;
00202 
00216         static int compareLocationValues(
00217                 unsigned int componentIndex0, unsigned int segmentIndex0, double segmentFraction0,
00218                 unsigned int componentIndex1, unsigned int segmentIndex1, double segmentFraction1);
00219 
00227         bool isOnSameSegment(const LinearLocation& loc) const;
00228 
00229 
00230         friend std::ostream& operator<< (std::ostream& out, const LinearLocation& obj );
00231 
00232 };
00233 
00234 
00235 } // namespace geos.linearref
00236 } // namespace geos
00237 
00238 #endif

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