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# LineSegment.h

    00001 /**********************************************************************
    00002  * $Id: LineSegment.h 3257 2011-03-02 12:46:57Z strk $
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2009 2011 Sandro Santilli <strk@keybit.net>
    00008  * Copyright (C) 2005-2006 Refractions Research Inc.
    00009  * Copyright (C) 2001-2002 Vivid Solutions Inc.
    00010  *
    00011  * This is free software; you can redistribute and/or modify it under
    00012  * the terms of the GNU Lesser General Public Licence as published
    00013  * by the Free Software Foundation.
    00014  * See the COPYING file for more information.
    00015  *
    00016  **********************************************************************
    00017  *
    00018  * Last port: geom/LineSegment.java r18 (JTS-1.11)
    00019  *
    00020  **********************************************************************/
    00021
    00022 #ifndef GEOS_GEOM_LINESEGMENT_H
    00023 #define GEOS_GEOM_LINESEGMENT_H
    00024
    00025 #include <geos/export.h>
    00026 #include <geos/geom/Coordinate.h> // for composition
    00027
    00028 #include <geos/inline.h>
    00029
    00030 #include <iostream> // for ostream
    00031 #include <memory> // for auto_ptr
    00032
    00033 // Forward declarations
    00034 namespace geos {
    00035         namespace geom {
    00036                 class CoordinateSequence;
    00037                 class GeometryFactory;
    00038                 class LineString;
    00039         }
    00040 }
    00041
    00042 namespace geos {
    00043 namespace geom { // geos::geom
    00044
    00058 class GEOS_DLL LineSegment {
    00059 public:
    00060
    00061         friend std::ostream& operator<< (std::ostream& o, const LineSegment& l);
    00062
    00063         Coordinate p0;
    00064
    00065         Coordinate p1;
    00066
    00067         LineSegment();
    00068
    00069         LineSegment(const LineSegment &ls);
    00070
    00072         LineSegment(const Coordinate& c0, const Coordinate& c1);
    00073
    00074         LineSegment(double x0, double y0, double x1, double y1);
    00075
    00076         virtual ~LineSegment();
    00077
    00078         void setCoordinates(const Coordinate& c0, const Coordinate& c1);
    00079
    00080         // obsoleted, use operator[] instead
    00081         //const Coordinate& getCoordinate(std::size_t i) const;
    00082
    00083         const Coordinate& operator[](std::size_t i) const;
    00084         Coordinate& operator[](std::size_t i);
    00085
    00086         void setCoordinates(const LineSegment& ls);
    00087
    00089         double getLength() const;
    00090
    00092         //
    00095         bool isHorizontal() const;
    00096
    00098         //
    00101         bool isVertical() const;
    00102
    00124         int orientationIndex(const LineSegment& seg) const;
    00125
    00126         // TODO: deprecate this
    00127         int orientationIndex(const LineSegment* seg) const;
    00128
    00145         int orientationIndex(const Coordinate& p) const;
    00146
    00148         void reverse();
    00149
    00151         //
    00155         void normalize();
    00156
    00158         double angle() const;
    00159
    00161         //
    00164         void midPoint(Coordinate& ret) const;
    00165
    00167         double distance(const LineSegment& ls) const;
    00168
    00170         double distance(const Coordinate& p) const;
    00171
    00176         double distancePerpendicular(const Coordinate& p) const;
    00177
    00192         void pointAlong(double segmentLengthFraction, Coordinate& ret) const;
    00193
    00218         void pointAlongOffset(double segmentLengthFraction,
    00219                               double offsetDistance,
    00220                               Coordinate& ret) const;
    00221
    00239         double projectionFactor(const Coordinate& p) const;
    00240
    00256         double segmentFraction(const Coordinate& inputPt) const;
    00257
    00266         void project(const Coordinate& p, Coordinate& ret) const;
    00267
    00283         bool project(const LineSegment& seg, LineSegment& ret) const;
    00284
    00286         //
    00291         void closestPoint(const Coordinate& p, Coordinate& ret) const;
    00292
    00304         int compareTo(const LineSegment& other) const;
    00305
    00315         bool equalsTopo(const LineSegment& other) const;
    00316
    00324         CoordinateSequence* closestPoints(const LineSegment& line);
    00325
    00326         CoordinateSequence* closestPoints(const LineSegment* line);
    00327
    00341         bool intersection(const LineSegment& line, Coordinate& coord) const;
    00342
    00360         bool lineIntersection(const LineSegment& line, Coordinate& coord) const;
    00361
    00368         std::auto_ptr<LineString> toGeometry(const GeometryFactory& gf) const;
    00369
    00370 };
    00371
    00372 std::ostream& operator<< (std::ostream& o, const LineSegment& l);
    00373
    00375 bool operator==(const LineSegment& a, const LineSegment& b);
    00376
    00377
    00378 } // namespace geos::geom
    00379 } // namespace geos
    00380
    00381 #ifdef GEOS_INLINE
    00382 # include "geos/geom/LineSegment.inl"
    00383 #endif
    00384
    00385 #endif // ndef GEOS_GEOM_LINESEGMENT_H
    00386
    00387 /**********************************************************************
    00388  * $Log$
    00389  * Revision 1.8  2006/07/21 14:49:58  strk
    00390  * Fixed typo in comment
    00391  *
    00392  * Revision 1.7  2006/06/12 10:10:39  strk
    00393  * Fixed getGeometryN() to take size_t rather then int, changed unsigned int parameters to size_t.
    00394  *
    00395  * Revision 1.6  2006/04/12 17:19:56  strk
    00396  * Ported TaggedLineStringSimplifier class, made LineSegment class
    00397  * polymorphic to fix derivation of TaggedLineSegment
    00398  *
    00399  * Revision 1.5  2006/03/28 09:14:12  strk
    00400  * Headers inclusion fix.
    00401  *
    00402  * Revision 1.4  2006/03/24 09:52:41  strk
    00403  * USE_INLINE => GEOS_INLINE
    00404  *
    00405  * Revision 1.3  2006/03/16 13:28:22  strk
    00406  * obsoleted getCoordinate(), replaced by operator[]
    00407  *
    00408  * Revision 1.2  2006/03/13 22:33:09  strk
    00409  * Added missing forward declarations
    00410  *
    00411  * Revision 1.1  2006/03/09 16:46:49  strk
    00412  * geos::geom namespace definition, first pass at headers split
    00413  *
    00414  **********************************************************************/