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# OffsetPointGenerator.h

    00001 /**********************************************************************
    00002  * $Id: OffsetPointGenerator.h 1941 2006-12-13 10:55:55Z strk $
    00003  *
    00004  * GEOS - Geometry Engine Open Source
    00005  * http://geos.refractions.net
    00006  *
    00007  * Copyright (C) 2006 Refractions Research Inc.
    00008  *
    00009  * This is free software; you can redistribute and/or modify it under
    00010  * the terms of the GNU Lesser General Public Licence as published
    00011  * by the Free Software Foundation.
    00012  * See the COPYING file for more information.
    00013  *
    00014  ***********************************************************************
    00015  *
    00016  * Last port: operation/overlay/validate/OffsetPointGenerator.java rev. 1.1
    00017  * (we should move in GEOS too, probably)
    00018  *
    00019  **********************************************************************/
    00020
    00021 #ifndef GEOS_OP_OVERLAY_OFFSETPOINTGENERATOR_H
    00022 #define GEOS_OP_OVERLAY_OFFSETPOINTGENERATOR_H
    00023
    00024 #include <geos/algorithm/PointLocator.h> // for composition
    00025 #include <geos/geom/Geometry.h> // for auto_ptr visibility of dtor
    00026 #include <geos/geom/MultiPoint.h> // for auto_ptr visibility of dtor
    00027 #include <geos/geom/Coordinate.h> // for use in vector
    00028
    00029 #include <vector>
    00030 #include <memory> // for auto_ptr
    00031
    00032 // Forward declarations
    00033 namespace geos {
    00034         namespace geom {
    00035                 //class Geometry;
    00036                 //class MultiPoint;
    00037                 class LineString;
    00038                 //class Coordinate;
    00039         }
    00040 }
    00041
    00042 namespace geos {
    00043 namespace operation { // geos::operation
    00044 namespace overlay { // geos::operation::overlay
    00045
    00047 //
    00048 class OffsetPointGenerator {
    00049
    00050 public:
    00051
    00052         OffsetPointGenerator(const geom::Geometry& geom, double offset);
    00053
    00055         std::auto_ptr< std::vector<geom::Coordinate> > getPoints();
    00056
    00057 private:
    00058
    00059         const geom::Geometry& g;
    00060
    00061         double offsetDistance;
    00062
    00063         std::auto_ptr< std::vector<geom::Coordinate> > offsetPts;
    00064
    00065         void extractPoints(const geom::LineString* line);
    00066
    00067         void computeOffsets(const geom::Coordinate& p0,
    00068                         const geom::Coordinate& p1);
    00069 };
    00070
    00071 } // namespace geos::operation::overlay
    00072 } // namespace geos::operation
    00073 } // namespace geos
    00074
    00075 #endif // ndef GEOS_OP_OVERLAY_OFFSETPOINTGENERATOR_H
    00076
    00077 /**********************************************************************
    00078  * $Log$
    00079  **********************************************************************/
    00080