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25 // 25 //
26 // G4ReduciblePolygon implementation; a utilit << 26 //
27 // test, reduce, and/or otherwise manipulate a << 27 // $Id: G4ReduciblePolygon.cc,v 1.11 2006/06/29 18:48:53 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01 $
>> 29 //
>> 30 //
>> 31 // --------------------------------------------------------------------
>> 32 // GEANT 4 class source file
>> 33 //
>> 34 //
>> 35 // G4ReduciblePolygon.cc
>> 36 //
>> 37 // Implementation of a utility class used to specify, test, reduce,
>> 38 // and/or otherwise manipulate a 2D polygon.
>> 39 //
28 // See G4ReduciblePolygon.hh for more info. 40 // See G4ReduciblePolygon.hh for more info.
29 // 41 //
30 // Author: David C. Williams (davidw@scipp.ucs <<
31 // ------------------------------------------- 42 // --------------------------------------------------------------------
32 43
33 #include "G4ReduciblePolygon.hh" 44 #include "G4ReduciblePolygon.hh"
34 #include "globals.hh" 45 #include "globals.hh"
35 46
>> 47 //
36 // Constructor: with simple arrays 48 // Constructor: with simple arrays
37 // 49 //
38 G4ReduciblePolygon::G4ReduciblePolygon( const 50 G4ReduciblePolygon::G4ReduciblePolygon( const G4double a[],
39 const 51 const G4double b[],
40 52 G4int n )
41 : aMin(0.), aMax(0.), bMin(0.), bMax(0.) << 53 : aMin(0.), aMax(0.), bMin(0.), bMax(0.),
>> 54 vertexHead(0)
42 { 55 {
43 // 56 //
44 // Do all of the real work in Create 57 // Do all of the real work in Create
45 // 58 //
46 Create( a, b, n ); 59 Create( a, b, n );
47 } 60 }
48 61
>> 62
>> 63 //
49 // Constructor: special PGON/PCON case 64 // Constructor: special PGON/PCON case
50 // 65 //
51 G4ReduciblePolygon::G4ReduciblePolygon( const 66 G4ReduciblePolygon::G4ReduciblePolygon( const G4double rmin[],
52 const 67 const G4double rmax[],
53 const 68 const G4double z[], G4int n )
54 : aMin(0.), aMax(0.), bMin(0.), bMax(0.) << 69 : aMin(0.), aMax(0.), bMin(0.), bMax(0.),
>> 70 vertexHead(0)
55 { 71 {
56 // 72 //
57 // Translate 73 // Translate
58 // 74 //
59 auto a = new G4double[n*2]; << 75 G4double *a = new G4double[n*2];
60 auto b = new G4double[n*2]; << 76 G4double *b = new G4double[n*2];
61 77
62 G4double *rOut = a + n, 78 G4double *rOut = a + n,
63 *zOut = b + n, 79 *zOut = b + n,
64 *rIn = rOut-1, 80 *rIn = rOut-1,
65 *zIn = zOut-1; 81 *zIn = zOut-1;
66 82
67 for( G4int i=0; i < n; ++i, ++rOut, ++zOut, << 83 G4int i;
>> 84 for( i=0; i < n; i++, rOut++, zOut++, rIn--, zIn-- )
68 { 85 {
69 *rOut = rmax[i]; 86 *rOut = rmax[i];
70 *rIn = rmin[i]; 87 *rIn = rmin[i];
71 *zOut = *zIn = z[i]; 88 *zOut = *zIn = z[i];
72 } 89 }
73 90
74 Create( a, b, n*2 ); 91 Create( a, b, n*2 );
75 92
76 delete [] a; 93 delete [] a;
77 delete [] b; 94 delete [] b;
78 } 95 }
79 96
>> 97
>> 98 //
80 // Create 99 // Create
81 // 100 //
82 // To be called by constructors, fill in the l 101 // To be called by constructors, fill in the list and statistics for a new
83 // polygon 102 // polygon
84 // 103 //
85 void G4ReduciblePolygon::Create( const G4doubl 104 void G4ReduciblePolygon::Create( const G4double a[],
86 const G4doubl 105 const G4double b[], G4int n )
87 { 106 {
88 if (n<3) 107 if (n<3)
89 G4Exception("G4ReduciblePolygon::Create()", << 108 G4Exception("G4ReduciblePolygon::Create()", "WrongArgumentValue",
90 FatalErrorInArgument, "Less tha << 109 FatalException, "Less than 3 vertices specified.");
91 110
92 const G4double *anext = a, *bnext = b; 111 const G4double *anext = a, *bnext = b;
93 ABVertex* prev = nullptr; << 112 ABVertex *prev = 0;
94 do // Loop checking, 13.08.2015, G.Cosmo << 113 do
95 { 114 {
96 auto newVertex = new ABVertex; << 115 ABVertex *newVertex = new ABVertex;
97 newVertex->a = *anext; 116 newVertex->a = *anext;
98 newVertex->b = *bnext; 117 newVertex->b = *bnext;
99 newVertex->next = nullptr; << 118 newVertex->next = 0;
100 if (prev==nullptr) << 119 if (prev==0)
101 { 120 {
102 vertexHead = newVertex; 121 vertexHead = newVertex;
103 } 122 }
104 else 123 else
105 { 124 {
106 prev->next = newVertex; 125 prev->next = newVertex;
107 } 126 }
108 127
109 prev = newVertex; 128 prev = newVertex;
110 } while( ++anext, ++bnext < b+n ); 129 } while( ++anext, ++bnext < b+n );
111 130
112 numVertices = n; 131 numVertices = n;
113 132
114 CalculateMaxMin(); 133 CalculateMaxMin();
115 } 134 }
116 135
>> 136
>> 137 //
117 // Fake default constructor - sets only member 138 // Fake default constructor - sets only member data and allocates memory
118 // for usage restri 139 // for usage restricted to object persistency.
119 // 140 //
120 G4ReduciblePolygon::G4ReduciblePolygon( __void 141 G4ReduciblePolygon::G4ReduciblePolygon( __void__& )
121 : aMin(0.), aMax(0.), bMin(0.), bMax(0.) << 142 : aMin(0.), aMax(0.), bMin(0.), bMax(0.), vertexHead(0)
122 { 143 {
123 } 144 }
124 145
125 146
126 // 147 //
127 // Destructor 148 // Destructor
128 // 149 //
129 G4ReduciblePolygon::~G4ReduciblePolygon() 150 G4ReduciblePolygon::~G4ReduciblePolygon()
130 { 151 {
131 ABVertex* curr = vertexHead; << 152 ABVertex *curr = vertexHead;
132 while( curr != nullptr ) // Loop checking << 153 while( curr )
133 { 154 {
134 ABVertex* toDelete = curr; << 155 ABVertex *toDelete = curr;
135 curr = curr->next; 156 curr = curr->next;
136 delete toDelete; 157 delete toDelete;
137 } 158 }
138 } 159 }
139 160
>> 161
>> 162 //
140 // CopyVertices 163 // CopyVertices
141 // 164 //
142 // Copy contents into simple linear arrays. 165 // Copy contents into simple linear arrays.
143 // ***** CAUTION ***** Be care to declare the 166 // ***** CAUTION ***** Be care to declare the arrays to a large
144 // enough size! 167 // enough size!
145 // 168 //
146 void G4ReduciblePolygon::CopyVertices( G4doubl 169 void G4ReduciblePolygon::CopyVertices( G4double a[], G4double b[] ) const
147 { 170 {
148 G4double *anext = a, *bnext = b; 171 G4double *anext = a, *bnext = b;
149 ABVertex *curr = vertexHead; 172 ABVertex *curr = vertexHead;
150 while( curr != nullptr ) // Loop checking << 173 while( curr )
151 { 174 {
152 *anext++ = curr->a; 175 *anext++ = curr->a;
153 *bnext++ = curr->b; 176 *bnext++ = curr->b;
154 curr = curr->next; 177 curr = curr->next;
155 } 178 }
156 } 179 }
157 180
>> 181
>> 182 //
158 // ScaleA 183 // ScaleA
159 // 184 //
160 // Multiply all a values by a common scale 185 // Multiply all a values by a common scale
161 // 186 //
162 void G4ReduciblePolygon::ScaleA( G4double scal 187 void G4ReduciblePolygon::ScaleA( G4double scale )
163 { 188 {
164 ABVertex* curr = vertexHead; << 189 ABVertex *curr = vertexHead;
165 while( curr != nullptr ) // Loop checking << 190 while( curr )
166 { 191 {
167 curr->a *= scale; 192 curr->a *= scale;
168 curr = curr->next; 193 curr = curr->next;
169 } 194 }
170 } 195 }
171 196
>> 197
>> 198 //
172 // ScaleB 199 // ScaleB
173 // 200 //
174 // Multiply all b values by a common scale 201 // Multiply all b values by a common scale
175 // 202 //
176 void G4ReduciblePolygon::ScaleB( G4double scal 203 void G4ReduciblePolygon::ScaleB( G4double scale )
177 { 204 {
178 ABVertex* curr = vertexHead; << 205 ABVertex *curr = vertexHead;
179 while( curr != nullptr ) // Loop checking << 206 while( curr )
180 { 207 {
181 curr->b *= scale; 208 curr->b *= scale;
182 curr = curr->next; 209 curr = curr->next;
183 } 210 }
184 } 211 }
185 212
>> 213
>> 214 //
186 // RemoveDuplicateVertices 215 // RemoveDuplicateVertices
187 // 216 //
188 // Remove adjacent vertices that are equal. Re 217 // Remove adjacent vertices that are equal. Returns "false" if there
189 // is a problem (too few vertices remaining). 218 // is a problem (too few vertices remaining).
190 // 219 //
191 G4bool G4ReduciblePolygon::RemoveDuplicateVert 220 G4bool G4ReduciblePolygon::RemoveDuplicateVertices( G4double tolerance )
192 { 221 {
193 ABVertex *curr = vertexHead, 222 ABVertex *curr = vertexHead,
194 *prev = nullptr, *next = nullptr; << 223 *prev = 0,
195 while( curr != nullptr ) // Loop checking << 224 *next = curr->next; // A little dangerous
>> 225 while( curr )
196 { 226 {
197 next = curr->next; 227 next = curr->next;
198 if (next == nullptr) next = vertexHead; << 228 if (next == 0) next = vertexHead;
199 229
200 if (std::fabs(curr->a-next->a) < tolerance 230 if (std::fabs(curr->a-next->a) < tolerance &&
201 std::fabs(curr->b-next->b) < tolerance 231 std::fabs(curr->b-next->b) < tolerance )
202 { 232 {
203 // 233 //
204 // Duplicate found: do we have > 3 verti 234 // Duplicate found: do we have > 3 vertices?
205 // 235 //
206 if (numVertices <= 3) 236 if (numVertices <= 3)
207 { 237 {
208 CalculateMaxMin(); 238 CalculateMaxMin();
209 return false; 239 return false;
210 } 240 }
211 241
212 // 242 //
213 // Delete 243 // Delete
214 // 244 //
215 ABVertex* toDelete = curr; << 245 ABVertex *toDelete = curr;
216 curr = curr->next; 246 curr = curr->next;
217 delete toDelete; 247 delete toDelete;
218 248
219 numVertices--; 249 numVertices--;
220 250
221 if (prev != nullptr) << 251 if (prev) prev->next = curr; else vertexHead = curr;
222 prev->next = curr; <<
223 else <<
224 vertexHead = curr; <<
225 } 252 }
226 else 253 else
227 { 254 {
228 prev = curr; 255 prev = curr;
229 curr = curr->next; 256 curr = curr->next;
230 } 257 }
231 } 258 }
232 259
233 // 260 //
234 // In principle, this is not needed, but why 261 // In principle, this is not needed, but why not just play it safe?
235 // 262 //
236 CalculateMaxMin(); 263 CalculateMaxMin();
237 264
238 return true; 265 return true;
239 } 266 }
240 267
>> 268
>> 269 //
241 // RemoveRedundantVertices 270 // RemoveRedundantVertices
242 // 271 //
243 // Remove any unneeded vertices, i.e. those ve 272 // Remove any unneeded vertices, i.e. those vertices which
244 // are on the line connecting the previous and 273 // are on the line connecting the previous and next vertices.
245 // 274 //
246 G4bool G4ReduciblePolygon::RemoveRedundantVert 275 G4bool G4ReduciblePolygon::RemoveRedundantVertices( G4double tolerance )
247 { 276 {
248 // 277 //
249 // Under these circumstances, we can quit no 278 // Under these circumstances, we can quit now!
250 // 279 //
251 if (numVertices <= 2) return false; 280 if (numVertices <= 2) return false;
252 281
253 G4double tolerance2 = tolerance*tolerance; 282 G4double tolerance2 = tolerance*tolerance;
254 283
255 // 284 //
256 // Loop over all vertices 285 // Loop over all vertices
257 // 286 //
258 ABVertex *curr = vertexHead, *next = nullptr << 287 ABVertex *curr = vertexHead,
259 while( curr != nullptr ) // Loop checking << 288 *next = curr->next; // A little dangerous
>> 289 while( curr )
260 { 290 {
261 next = curr->next; 291 next = curr->next;
262 if (next == nullptr) next = vertexHead; << 292 if (next == 0) next = vertexHead;
263 293
264 G4double da = next->a - curr->a, 294 G4double da = next->a - curr->a,
265 db = next->b - curr->b; 295 db = next->b - curr->b;
266 296
267 // 297 //
268 // Loop over all subsequent vertices, up t 298 // Loop over all subsequent vertices, up to curr
269 // 299 //
270 for(;;) 300 for(;;)
271 { 301 {
272 // 302 //
273 // Get vertex after next 303 // Get vertex after next
274 // 304 //
275 ABVertex* test = next->next; << 305 ABVertex *test = next->next;
276 if (test == nullptr) test = vertexHead; << 306 if (test == 0) test = vertexHead;
277 307
278 // 308 //
279 // If we are back to the original vertex 309 // If we are back to the original vertex, stop
280 // 310 //
281 if (test==curr) break; 311 if (test==curr) break;
282 312
283 // 313 //
284 // Test for parallel line segments 314 // Test for parallel line segments
285 // 315 //
286 G4double dat = test->a - curr->a, 316 G4double dat = test->a - curr->a,
287 dbt = test->b - curr->b; 317 dbt = test->b - curr->b;
288 318
289 if (std::fabs(dat*db-dbt*da)>tolerance2) 319 if (std::fabs(dat*db-dbt*da)>tolerance2) break;
290 320
291 // 321 //
292 // Redundant vertex found: do we have > 322 // Redundant vertex found: do we have > 3 vertices?
293 // 323 //
294 if (numVertices <= 3) 324 if (numVertices <= 3)
295 { 325 {
296 CalculateMaxMin(); 326 CalculateMaxMin();
297 return false; 327 return false;
298 } 328 }
299 329
300 // 330 //
301 // Delete vertex pointed to by next. Car 331 // Delete vertex pointed to by next. Carefully!
302 // 332 //
303 if (curr->next != nullptr) << 333 if (curr->next)
304 { // next is not head 334 { // next is not head
305 if (next->next != nullptr) << 335 if (next->next)
306 curr->next = test; // next is not t 336 curr->next = test; // next is not tail
307 else 337 else
308 curr->next = nullptr; // New tail << 338 curr->next = 0; // New tail
309 } 339 }
310 else 340 else
311 vertexHead = test; // New head 341 vertexHead = test; // New head
312 342
313 if ((curr != next) && (next != test)) de << 343 delete next;
314 344
315 --numVertices; << 345 numVertices--;
316 346
317 // 347 //
318 // Replace next by the vertex we just te 348 // Replace next by the vertex we just tested,
319 // and keep on going... 349 // and keep on going...
320 // 350 //
321 next = test; 351 next = test;
322 da = dat; db = dbt; 352 da = dat; db = dbt;
323 } 353 }
324 curr = curr->next; 354 curr = curr->next;
325 } 355 }
326 356
327 // 357 //
328 // In principle, this is not needed, but why 358 // In principle, this is not needed, but why not just play it safe?
329 // 359 //
330 CalculateMaxMin(); 360 CalculateMaxMin();
331 361
332 return true; 362 return true;
333 } 363 }
334 364
>> 365
>> 366 //
335 // ReverseOrder 367 // ReverseOrder
336 // 368 //
337 // Reverse the order of the vertices 369 // Reverse the order of the vertices
338 // 370 //
339 void G4ReduciblePolygon::ReverseOrder() 371 void G4ReduciblePolygon::ReverseOrder()
340 { 372 {
341 // 373 //
342 // Loop over all vertices 374 // Loop over all vertices
343 // 375 //
344 ABVertex* prev = vertexHead; << 376 ABVertex *prev = vertexHead;
345 if (prev==nullptr) return; // No vertices << 377 if (prev==0) return; // No vertices
346 378
347 ABVertex* curr = prev->next; << 379 ABVertex *curr = prev->next;
348 if (curr==nullptr) return; // Just one ve << 380 if (curr==0) return; // Just one vertex
349 381
350 // 382 //
351 // Our new tail 383 // Our new tail
352 // 384 //
353 vertexHead->next = nullptr; << 385 vertexHead->next = 0;
354 386
355 for(;;) 387 for(;;)
356 { 388 {
357 // 389 //
358 // Save pointer to next vertex (in origina 390 // Save pointer to next vertex (in original order)
359 // 391 //
360 ABVertex *save = curr->next; 392 ABVertex *save = curr->next;
361 393
362 // 394 //
363 // Replace it with a pointer to the previo 395 // Replace it with a pointer to the previous one
364 // (in original order) 396 // (in original order)
365 // 397 //
366 curr->next = prev; 398 curr->next = prev;
367 399
368 // 400 //
369 // Last vertex? 401 // Last vertex?
370 // 402 //
371 if (save == nullptr) break; << 403 if (save == 0) break;
372 404
373 // 405 //
374 // Next vertex 406 // Next vertex
375 // 407 //
376 prev = curr; 408 prev = curr;
377 curr = save; 409 curr = save;
378 } 410 }
379 411
380 // 412 //
381 // Our new head 413 // Our new head
382 // 414 //
383 vertexHead = curr; 415 vertexHead = curr;
384 } 416 }
385 417
386 418
387 // StartWithZMin <<
388 // <<
389 // Starting alway with Zmin=bMin <<
390 // This method is used for GenericPolycone <<
391 // 419 //
392 void G4ReduciblePolygon::StartWithZMin() <<
393 { <<
394 ABVertex* curr = vertexHead; <<
395 G4double bcurr = curr->b; <<
396 ABVertex* prev = curr; <<
397 while( curr != nullptr) // Loop checking, <<
398 { <<
399 if(curr->b < bcurr) <<
400 { <<
401 bcurr = curr->b; <<
402 ABVertex* curr1 = curr; <<
403 while( curr1 != nullptr ) // Loop che <<
404 { <<
405 if(curr1->next == nullptr) { curr1->ne <<
406 curr1 = curr1->next; <<
407 } <<
408 vertexHead = curr; <<
409 prev->next = nullptr; <<
410 } <<
411 prev = curr; <<
412 curr = curr->next; <<
413 } <<
414 } <<
415 <<
416 // CrossesItself 420 // CrossesItself
417 // 421 //
418 // Return "true" if the polygon crosses itself 422 // Return "true" if the polygon crosses itself
419 // 423 //
420 // Warning: this routine is not very fast (run 424 // Warning: this routine is not very fast (runs as N**2)
421 // 425 //
422 G4bool G4ReduciblePolygon::CrossesItself( G4do 426 G4bool G4ReduciblePolygon::CrossesItself( G4double tolerance )
423 { 427 {
424 G4double tolerance2 = tolerance*tolerance; 428 G4double tolerance2 = tolerance*tolerance;
425 G4double one = 1.0-tolerance, << 429 G4double one = 1.0-tolerance,
426 zero = tolerance; << 430 zero = tolerance;
427 // 431 //
428 // Top loop over line segments. By the time 432 // Top loop over line segments. By the time we finish
429 // with the second to last segment, we're do 433 // with the second to last segment, we're done.
430 // 434 //
431 ABVertex *curr1 = vertexHead, *next1 = nullp << 435 ABVertex *curr1 = vertexHead, *next1=0;
432 while (curr1->next != nullptr) // Loop ch << 436 while (curr1->next) {
433 { << 437 next1 = curr1->next;
434 next1 = curr1->next; <<
435 G4double da1 = next1->a-curr1->a, 438 G4double da1 = next1->a-curr1->a,
436 db1 = next1->b-curr1->b; << 439 db1 = next1->b-curr1->b;
437 440
438 // 441 //
439 // Inner loop over subsequent line segment 442 // Inner loop over subsequent line segments
440 // 443 //
441 ABVertex* curr2 = next1->next; << 444 ABVertex *curr2 = next1->next;
442 while( curr2 != nullptr ) // Loop check << 445 while( curr2 ) {
443 { << 446 ABVertex *next2 = curr2->next;
444 ABVertex* next2 = curr2->next; << 447 if (next2==0) next2 = vertexHead;
445 if (next2==nullptr) next2 = vertexHead; <<
446 G4double da2 = next2->a-curr2->a, 448 G4double da2 = next2->a-curr2->a,
447 db2 = next2->b-curr2->b; << 449 db2 = next2->b-curr2->b;
448 G4double a12 = curr2->a-curr1->a, 450 G4double a12 = curr2->a-curr1->a,
449 b12 = curr2->b-curr1->b; << 451 b12 = curr2->b-curr1->b;
450 452
451 // 453 //
452 // Calculate intersection of the two lin 454 // Calculate intersection of the two lines
453 // 455 //
454 G4double deter = da1*db2 - db1*da2; 456 G4double deter = da1*db2 - db1*da2;
455 if (std::fabs(deter) > tolerance2) << 457 if (std::fabs(deter) > tolerance2) {
456 { <<
457 G4double s1, s2; 458 G4double s1, s2;
458 s1 = (a12*db2-b12*da2)/deter; 459 s1 = (a12*db2-b12*da2)/deter;
459 460
460 if (s1 >= zero && s1 < one) << 461 if (s1 >= zero && s1 < one) {
461 { <<
462 s2 = -(da1*b12-db1*a12)/deter; 462 s2 = -(da1*b12-db1*a12)/deter;
463 if (s2 >= zero && s2 < one) return t 463 if (s2 >= zero && s2 < one) return true;
464 } 464 }
465 } 465 }
466 curr2 = curr2->next; 466 curr2 = curr2->next;
467 } 467 }
468 curr1 = next1; 468 curr1 = next1;
469 } 469 }
470 return false; 470 return false;
471 } 471 }
472 472
>> 473
>> 474
>> 475 //
473 // BisectedBy 476 // BisectedBy
474 // 477 //
475 // Decide if a line through two points crosses 478 // Decide if a line through two points crosses the polygon, within tolerance
476 // 479 //
477 G4bool G4ReduciblePolygon::BisectedBy( G4doubl 480 G4bool G4ReduciblePolygon::BisectedBy( G4double a1, G4double b1,
478 G4doubl 481 G4double a2, G4double b2,
479 G4doubl 482 G4double tolerance )
480 { 483 {
481 G4int nNeg = 0, nPos = 0; 484 G4int nNeg = 0, nPos = 0;
482 485
483 G4double a12 = a2-a1, b12 = b2-b1; 486 G4double a12 = a2-a1, b12 = b2-b1;
484 G4double len12 = std::sqrt( a12*a12 + b12*b1 487 G4double len12 = std::sqrt( a12*a12 + b12*b12 );
485 a12 /= len12; b12 /= len12; 488 a12 /= len12; b12 /= len12;
486 489
487 ABVertex* curr = vertexHead; << 490 ABVertex *curr = vertexHead;
488 do // Loop checking, 13.08.2015, G.Cosmo << 491 do
489 { 492 {
490 G4double av = curr->a - a1, 493 G4double av = curr->a - a1,
491 bv = curr->b - b1; << 494 bv = curr->b - b1;
492 495
493 G4double cross = av*b12 - bv*a12; 496 G4double cross = av*b12 - bv*a12;
494 497
495 if (cross < -tolerance) 498 if (cross < -tolerance)
496 { 499 {
497 if (nPos != 0) return true; << 500 if (nPos) return true;
498 ++nNeg; << 501 nNeg++;
499 } 502 }
500 else if (cross > tolerance) 503 else if (cross > tolerance)
501 { 504 {
502 if (nNeg != 0) return true; << 505 if (nNeg) return true;
503 ++nPos; << 506 nPos++;
504 } 507 }
505 curr = curr->next; 508 curr = curr->next;
506 } while( curr != nullptr ); << 509 } while( curr );
507 510
508 return false; 511 return false;
509 } 512 }
510 513
>> 514
>> 515
>> 516 //
511 // Area 517 // Area
512 // 518 //
513 // Calculated signed polygon area, where polyg 519 // Calculated signed polygon area, where polygons specified in a
514 // clockwise manner (where x==a, y==b) have ne 520 // clockwise manner (where x==a, y==b) have negative area
515 // 521 //
516 // References: [O' Rourke (C)] pp. 18-27; [ 522 // References: [O' Rourke (C)] pp. 18-27; [Gems II] pp. 5-6:
517 // "The Area of a Simple Polygon", Jon Rokn 523 // "The Area of a Simple Polygon", Jon Rokne.
518 // 524 //
519 G4double G4ReduciblePolygon::Area() 525 G4double G4ReduciblePolygon::Area()
520 { 526 {
521 G4double answer = 0; 527 G4double answer = 0;
522 528
523 ABVertex *curr = vertexHead, *next = nullptr << 529 ABVertex *curr = vertexHead, *next;
524 do // Loop checking, 13.08.2015, G.Cosmo << 530 do
525 { 531 {
526 next = curr->next; 532 next = curr->next;
527 if (next==nullptr) next = vertexHead; << 533 if (next==0) next = vertexHead;
528 534
529 answer += curr->a*next->b - curr->b*next-> 535 answer += curr->a*next->b - curr->b*next->a;
530 curr = curr->next; 536 curr = curr->next;
531 } while( curr != nullptr ); << 537 } while( curr );
532 538
533 return 0.5*answer; 539 return 0.5*answer;
534 } 540 }
535 541
>> 542
>> 543 //
536 // Print 544 // Print
537 // 545 //
538 void G4ReduciblePolygon::Print() 546 void G4ReduciblePolygon::Print()
539 { 547 {
540 ABVertex* curr = vertexHead; << 548 ABVertex *curr = vertexHead;
541 do // Loop checking, 13.08.2015, G.Cosmo << 549 do
542 { 550 {
543 G4cerr << curr->a << " " << curr->b << G4e 551 G4cerr << curr->a << " " << curr->b << G4endl;
544 curr = curr->next; 552 curr = curr->next;
545 } while( curr != nullptr ); << 553 } while( curr );
546 } 554 }
547 555
>> 556
>> 557 //
548 // CalculateMaxMin 558 // CalculateMaxMin
549 // 559 //
550 // To be called when the vertices are changed, 560 // To be called when the vertices are changed, this
551 // routine re-calculates global values 561 // routine re-calculates global values
552 // 562 //
553 void G4ReduciblePolygon::CalculateMaxMin() 563 void G4ReduciblePolygon::CalculateMaxMin()
554 { 564 {
555 ABVertex* curr = vertexHead; << 565 ABVertex *curr = vertexHead;
556 aMin = aMax = curr->a; 566 aMin = aMax = curr->a;
557 bMin = bMax = curr->b; 567 bMin = bMax = curr->b;
558 curr = curr->next; 568 curr = curr->next;
559 while( curr != nullptr ) // Loop checking << 569 while( curr )
560 { 570 {
561 if (curr->a < aMin) 571 if (curr->a < aMin)
562 aMin = curr->a; 572 aMin = curr->a;
563 else if (curr->a > aMax) 573 else if (curr->a > aMax)
564 aMax = curr->a; 574 aMax = curr->a;
565 575
566 if (curr->b < bMin) 576 if (curr->b < bMin)
567 bMin = curr->b; 577 bMin = curr->b;
568 else if (curr->b > bMax) 578 else if (curr->b > bMax)
569 bMax = curr->b; 579 bMax = curr->b;
570 580
571 curr = curr->next; 581 curr = curr->next;
572 } 582 }
573 } 583 }
574 584