OffsetCurveBuilder.h

00001 /**********************************************************************
00002  * $Id: OffsetCurveBuilder.h 1959 2007-01-09 17:34:00Z strk $
00003  *
00004  * GEOS - Geometry Engine Open Source
00005  * http://geos.refractions.net
00006  *
00007  * Copyright (C) 2006-2007 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/buffer/OffsetCurveBuilder.java rev 1.10
00017  *
00018  **********************************************************************/
00019 
00020 #ifndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
00021 #define GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
00022 
00023 #include <vector>
00024 
00025 #include <geos/algorithm/LineIntersector.h> // for composition
00026 #include <geos/geom/Coordinate.h> // for composition
00027 #include <geos/geom/LineSegment.h> // for composition
00028 
00029 // Forward declarations
00030 namespace geos {
00031         namespace geom {
00032                 class CoordinateSequence;
00033                 class PrecisionModel;
00034         }
00035         namespace operation {
00036                 namespace buffer {
00037                         class OffsetCurveVertexList;
00038                 }
00039         }
00040 }
00041 
00042 namespace geos {
00043 namespace operation { // geos.operation
00044 namespace buffer { // geos.operation.buffer
00045 
00062 class OffsetCurveBuilder {
00063 public:
00071         static const int DEFAULT_QUADRANT_SEGMENTS=8;
00072 
00073         OffsetCurveBuilder(const geom::PrecisionModel *newPrecisionModel,
00074                         int quadrantSegments=DEFAULT_QUADRANT_SEGMENTS);
00075 
00076         ~OffsetCurveBuilder();
00077 
00078         void setEndCapStyle(int newEndCapStyle);
00079 
00088         void getLineCurve(const geom::CoordinateSequence* inputPts, double distance,
00089                 std::vector<geom::CoordinateSequence*>& lineList);
00090 
00098         void getRingCurve(const geom::CoordinateSequence *inputPts, int side,
00099                 double distance, std::vector<geom::CoordinateSequence*>& lineList);
00100 
00101 
00102 private:
00103 
00104         static const double MIN_CURVE_VERTEX_FACTOR; //  1.0E-6;
00105 
00106         static const double PI; //  3.14159265358979
00107 
00108         static const double MAX_CLOSING_SEG_LEN; // 3.0
00109 
00110         algorithm::LineIntersector li;
00111 
00116         double filletAngleQuantum;
00117 
00122         double maxCurveSegmentError;
00123 
00125         //
00132         OffsetCurveVertexList* vertexList;
00133 
00134         double distance;
00135 
00136         const geom::PrecisionModel* precisionModel;
00137 
00138         int endCapStyle;
00139 
00140         //int joinStyle;
00141 
00142         geom::Coordinate s0, s1, s2;
00143 
00144         geom::LineSegment seg0;
00145 
00146         geom::LineSegment seg1;
00147 
00148         geom::LineSegment offset0;
00149 
00150         geom::LineSegment offset1;
00151 
00152         int side;
00153 
00154 //      static geom::CoordinateSequence* copyCoordinates(geom::CoordinateSequence *pts);
00155 
00156         void init(double newDistance);
00157 
00158         //geom::CoordinateSequence* getCoordinates();
00159 
00160         void computeLineBufferCurve(const geom::CoordinateSequence& inputPts);
00161 
00162         void computeRingBufferCurve(const geom::CoordinateSequence& inputPts, int side);
00163 
00164         //void addPt(const geom::Coordinate &pt);
00165 
00166         //void closePts();
00167 
00168         void initSideSegments(const geom::Coordinate &nS1, const geom::Coordinate &nS2, int nSide);
00169 
00170         void addNextSegment(const geom::Coordinate &p, bool addStartPoint);
00171 
00173         void addLastSegment();
00174 
00185         void computeOffsetSegment(const geom::LineSegment& seg, int side, double distance,
00186                         geom::LineSegment& offset);
00187 
00189         void addLineEndCap(const geom::Coordinate &p0,const geom::Coordinate &p1);
00190 
00196         void addFillet(const geom::Coordinate &p, const geom::Coordinate &p0,
00197                         const geom::Coordinate &p1, int direction, double distance);
00198 
00206         void addFillet(const geom::Coordinate &p, double startAngle, double endAngle,
00207                         int direction, double distance);
00208 
00210         void addCircle(const geom::Coordinate &p, double distance);
00211 
00213         void addSquare(const geom::Coordinate &p, double distance);
00214 
00215         std::vector<OffsetCurveVertexList*> vertexLists;
00216 };
00217 
00218 // INLINES
00219 inline void OffsetCurveBuilder::setEndCapStyle(int newEndCapStyle) {
00220         endCapStyle=newEndCapStyle;
00221 }
00222 
00223 
00224 } // namespace geos::operation::buffer
00225 } // namespace geos::operation
00226 } // namespace geos
00227 
00228 #endif // ndef GEOS_OP_BUFFER_OFFSETCURVEBUILDER_H
00229 
00230 /**********************************************************************
00231  * $Log$
00232  * Revision 1.2  2006/03/27 17:04:17  strk
00233  * Cleanups and explicit initializations
00234  *
00235  * Revision 1.1  2006/03/14 00:19:40  strk
00236  * opBuffer.h split, streamlined headers in some (not all) files in operation/buffer/
00237  *
00238  **********************************************************************/
00239 

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