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# LineStringSnapper.h

    00001 /**********************************************************************
    00002  * $Id: LineStringSnapper.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) 2009  Sandro Santilli <strk@keybit.net>
    00008  * Copyright (C) 2006 Refractions Research 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: operation/overlay/snap/lineStringSnapper.java rev 1.5 (JTS-1.10)
    00018  *
    00019  **********************************************************************/
    00020
    00021 #ifndef GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
    00022 #define GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
    00023
    00024 #include <geos/geom/Coordinate.h>
    00025 #include <geos/geom/CoordinateSequence.h>
    00026 #include <geos/geom/CoordinateList.h>
    00027
    00028 #include <memory>
    00029
    00030 // Forward declarations
    00031 namespace geos {
    00032         namespace geom {
    00033                 //class PrecisionModel;
    00034                 //class CoordinateSequence;
    00035                 class CoordinateList;
    00036                 class Geometry;
    00037         }
    00038 }
    00039
    00040 namespace geos {
    00041 namespace operation { // geos::operation
    00042 namespace overlay { // geos::operation::overlay
    00043 namespace snap { // geos::operation::overlay::snap
    00044
    00052 class GEOS_DLL LineStringSnapper {
    00053
    00054 public:
    00055
    00063         LineStringSnapper(const geom::Coordinate::Vect& nSrcPts,
    00064                                                   double nSnapTol)
    00065                 :
    00066                 srcPts(nSrcPts),
    00067                 snapTolerance(nSnapTol)
    00068         {
    00069                 size_t s = srcPts.size();
    00070                 isClosed = ( s < 2 || srcPts[0].equals2D(srcPts[s-1]) );
    00071         }
    00072
    00073         // Snap points are assumed to be all distinct points (a set would be better, uh ?)
    00074         std::auto_ptr<geom::Coordinate::Vect> snapTo(const geom::Coordinate::ConstVect& snapPts);
    00075
    00076 private:
    00077
    00078         const geom::Coordinate::Vect& srcPts;
    00079
    00080         double snapTolerance;
    00081
    00082         bool isClosed;
    00083
    00084
    00085         // Modifies first arg
    00086         void snapVertices(geom::CoordinateList& srcCoords,
    00087                         const geom::Coordinate::ConstVect& snapPts);
    00088
    00089
    00090         // Returns snapPts.end() if no snap point is close enough (within snapTol distance)
    00091         geom::Coordinate::ConstVect::const_iterator findSnapForVertex(const geom::Coordinate& pt,
    00092                         const geom::Coordinate::ConstVect& snapPts);
    00093
    00094         // Modifies first arg
    00095         void snapSegments(geom::CoordinateList& srcCoords,
    00096                         const geom::Coordinate::ConstVect& snapPts);
    00097
    00101         //
    00119         geom::CoordinateList::iterator findSegmentToSnap(
    00120                         const geom::Coordinate& snapPt,
    00121                         geom::CoordinateList::iterator from,
    00122                         geom::CoordinateList::iterator too_far);
    00123
    00124     // Declare type as noncopyable
    00125     LineStringSnapper(const LineStringSnapper& other);
    00126     LineStringSnapper& operator=(const LineStringSnapper& rhs);
    00127 };
    00128
    00129
    00130 } // namespace geos::operation::overlay::snap
    00131 } // namespace geos::operation::overlay
    00132 } // namespace geos::operation
    00133 } // namespace geos
    00134
    00135 #endif // GEOS_OP_OVERLAY_SNAP_LINESTRINGSNAPPER_H
    00136