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OffsetSegmentGenerator.h
1 /**********************************************************************
2 * $Id$
3 *
4 * GEOS - Geometry Engine Open Source
5 * http://geos.refractions.net
6 *
7 * Copyright (C) 2011 Sandro Santilli <strk@keybit.net>
8 *
9 * This is free software; you can redistribute and/or modify it under
10 * the terms of the GNU Lesser General Public Licence as published
11 * by the Free Software Foundation.
12 * See the COPYING file for more information.
13 *
14 **********************************************************************
15 *
16 * Last port: operation/buffer/OffsetSegmentGenerator.java r378 (JTS-1.12)
17 *
18 **********************************************************************/
19
20 #ifndef GEOS_OP_BUFFER_OFFSETSEGMENTGENERATOR_H
21 #define GEOS_OP_BUFFER_OFFSETSEGMENTGENERATOR_H
22
23 #include <geos/export.h>
24
25 #include <vector>
26
27 #include <geos/algorithm/LineIntersector.h> // for composition
28 #include <geos/geom/Coordinate.h> // for composition
29 #include <geos/geom/LineSegment.h> // for composition
30 #include <geos/operation/buffer/BufferParameters.h> // for composition
31 #include <geos/operation/buffer/OffsetSegmentString.h> // for composition
32
33 #ifdef _MSC_VER
34 #pragma warning(push)
35 #pragma warning(disable: 4251) // warning C4251: needs to have dll-interface to be used by clients of class
36 #endif
37
38 // Forward declarations
39 namespace geos {
40 namespace geom {
41 class CoordinateSequence;
42 class PrecisionModel;
43 }
44 }
45
46 namespace geos {
47 namespace operation { // geos.operation
48 namespace buffer { // geos.operation.buffer
49
62 class GEOS_DLL OffsetSegmentGenerator {
63
64 public:
65
66 /*
67 * @param nBufParams buffer parameters, this object will
68 * keep a reference to the passed parameters
69 * so caller must make sure the object is
70 * kept alive for the whole lifetime of
71 * the buffer builder.
72 */
73 OffsetSegmentGenerator(const geom::PrecisionModel *newPrecisionModel,
74 const BufferParameters& bufParams, double distance);
75
88 bool hasNarrowConcaveAngle() const
89 {
90 return _hasNarrowConcaveAngle;
91 }
92
93 void initSideSegments(const geom::Coordinate &nS1,
94 const geom::Coordinate &nS2, int nSide);
95
97 //
104 void getCoordinates(std::vector<geom::CoordinateSequence*>& to) {
105 to.push_back(segList.getCoordinates());
106 }
107
108 void closeRing() {
109 segList.closeRing();
110 }
111
113 void createCircle(const geom::Coordinate &p, double distance);
114
116 void createSquare(const geom::Coordinate &p, double distance);
117
119 void addFirstSegment()
120 {
121 segList.addPt(offset1.p0);
122 }
123
125 void addLastSegment()
126 {
127 segList.addPt(offset1.p1);
128 }
129
130 void addNextSegment(const geom::Coordinate &p, bool addStartPoint);
131
135 void addLineEndCap(const geom::Coordinate &p0,
136 const geom::Coordinate &p1);
137
138 void addSegments(const geom::CoordinateSequence& pts, bool isForward)
139 {
140 segList.addPts(pts, isForward);
141 }
142
143 private:
144
149 static const double OFFSET_SEGMENT_SEPARATION_FACTOR; // 1.0E-3;
150
155 static const double INSIDE_TURN_VERTEX_SNAP_DISTANCE_FACTOR; // 1.0E-3;
156
160 static const double CURVE_VERTEX_SNAP_DISTANCE_FACTOR; // 1.0E-6;
161
165 static const int MAX_CLOSING_SEG_LEN_FACTOR = 80;
166
171 double maxCurveSegmentError; // 0.0
172
177 double filletAngleQuantum;
178
196 int closingSegLengthFactor; // 1;
197
199 //
206 OffsetSegmentString segList;
207
208 double distance;
209
210 const geom::PrecisionModel* precisionModel;
211
212 const BufferParameters& bufParams;
213
214 algorithm::LineIntersector li;
215
216 geom::Coordinate s0, s1, s2;
217
218 geom::LineSegment seg0;
219
220 geom::LineSegment seg1;
221
222 geom::LineSegment offset0;
223
224 geom::LineSegment offset1;
225
226 int side;
227
228 bool _hasNarrowConcaveAngle; // =false
229
230 void addCollinear(bool addStartPoint);
231
233 //
238 void addMitreJoin(const geom::Coordinate& p,
239 const geom::LineSegment& offset0,
240 const geom::LineSegment& offset1,
241 double distance);
242
244 //
253 void addLimitedMitreJoin(
254 const geom::LineSegment& offset0,
255 const geom::LineSegment& offset1,
256 double distance, double mitreLimit);
257
261 //
265 void addBevelJoin(const geom::LineSegment& offset0,
266 const geom::LineSegment& offset1);
267
268 static const double PI; // 3.14159265358979
269
270 // Not in JTS, used for single-sided buffers
271 int endCapIndex;
272
273 void init(double newDistance);
274
282 static const double SIMPLIFY_FACTOR; // 100.0;
283
285 //
289 void addOutsideTurn(int orientation, bool addStartPoint);
290
292 //
296 void addInsideTurn(int orientation, bool addStartPoint);
297
310 void computeOffsetSegment(const geom::LineSegment& seg,
311 int side, double distance,
312 geom::LineSegment& offset);
313
325 void addFillet(const geom::Coordinate &p, const geom::Coordinate &p0,
326 const geom::Coordinate &p1,
327 int direction, double radius);
328
338 void addFillet(const geom::Coordinate &p, double startAngle,
339 double endAngle, int direction, double radius);
340 private:
341 // An OffsetSegmentGenerator cannot be copied because of member "const BufferParameters& bufParams"
342 // Not declaring these functions triggers MSVC warning C4512: "assignment operator could not be generated"
343 OffsetSegmentGenerator(const OffsetSegmentGenerator&);
344 void operator=(const OffsetSegmentGenerator&);
345
346 };
347
348 } // namespace geos::operation::buffer
349 } // namespace geos::operation
350 } // namespace geos
351
352 #ifdef _MSC_VER
353 #pragma warning(pop)
354 #endif
355
356 #endif // ndef GEOS_OP_BUFFER_OFFSETSEGMENTGENERATOR_H
357