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25 // 25 //
26 // Class G4VoxelLimits implementation <<
27 // 26 //
28 // 13.07.95, P.Kent - Initial version << 27 // $Id$
>> 28 //
>> 29 // class G4VoxelLimits
>> 30 //
>> 31 // Implementation
>> 32 //
>> 33 // History:
>> 34 //
>> 35 // 14.03.02 V. Grichine, cosmetics
>> 36 // 13.07.95 P.Kent Initial version
29 // ------------------------------------------- 37 // --------------------------------------------------------------------
30 38
31 #include "G4VoxelLimits.hh" 39 #include "G4VoxelLimits.hh"
32 40
33 #include "G4ios.hh" 41 #include "G4ios.hh"
34 42
35 ////////////////////////////////////////////// 43 ///////////////////////////////////////////////////////////////////////////
36 // 44 //
>> 45 // Empty constructor and destructor
>> 46 //
>> 47
>> 48 G4VoxelLimits::G4VoxelLimits()
>> 49 : fxAxisMin(-kInfinity),fxAxisMax(kInfinity),
>> 50 fyAxisMin(-kInfinity),fyAxisMax(kInfinity),
>> 51 fzAxisMin(-kInfinity),fzAxisMax(kInfinity)
>> 52 {
>> 53 }
>> 54
>> 55 G4VoxelLimits::~G4VoxelLimits()
>> 56 {
>> 57 }
>> 58
>> 59 ///////////////////////////////////////////////////////////////////////////
>> 60 //
37 // Further restrict limits 61 // Further restrict limits
38 // No checks for illegal restrictions 62 // No checks for illegal restrictions
39 // 63 //
>> 64
40 void G4VoxelLimits::AddLimit( const EAxis pAxi 65 void G4VoxelLimits::AddLimit( const EAxis pAxis,
41 const G4double p 66 const G4double pMin,
42 const G4double p 67 const G4double pMax )
43 { 68 {
44 if ( pAxis == kXAxis ) 69 if ( pAxis == kXAxis )
45 { 70 {
46 if ( pMin > fxAxisMin ) fxAxisMin = pMin ; 71 if ( pMin > fxAxisMin ) fxAxisMin = pMin ;
47 if ( pMax < fxAxisMax ) fxAxisMax = pMax ; 72 if ( pMax < fxAxisMax ) fxAxisMax = pMax ;
48 } 73 }
49 else if ( pAxis == kYAxis ) 74 else if ( pAxis == kYAxis )
50 { 75 {
51 if ( pMin > fyAxisMin ) fyAxisMin = pMin ; 76 if ( pMin > fyAxisMin ) fyAxisMin = pMin ;
52 if ( pMax < fyAxisMax ) fyAxisMax = pMax ; 77 if ( pMax < fyAxisMax ) fyAxisMax = pMax ;
53 } 78 }
54 else 79 else
55 { 80 {
56 assert( pAxis == kZAxis ) ; 81 assert( pAxis == kZAxis ) ;
57 82
58 if ( pMin > fzAxisMin ) fzAxisMin = pMin ; 83 if ( pMin > fzAxisMin ) fzAxisMin = pMin ;
59 if ( pMax < fzAxisMax ) fzAxisMax = pMax ; 84 if ( pMax < fzAxisMax ) fzAxisMax = pMax ;
60 } 85 }
61 } 86 }
62 87
63 ////////////////////////////////////////////// 88 ///////////////////////////////////////////////////////////////////////////
64 // 89 //
65 // ClipToLimits 90 // ClipToLimits
66 // 91 //
67 // Clip the line segment pStart->pEnd to the v 92 // Clip the line segment pStart->pEnd to the volume described by the
68 // current limits. Return true if the line rem 93 // current limits. Return true if the line remains after clipping,
69 // else false, and leave the vectors in an und 94 // else false, and leave the vectors in an undefined state.
70 // 95 //
71 // Process: 96 // Process:
72 // 97 //
73 // Use Cohen-Sutherland clipping in 3D 98 // Use Cohen-Sutherland clipping in 3D
74 // [Fundamentals of Interactive Computer Graph 99 // [Fundamentals of Interactive Computer Graphics,Foley & Van Dam]
75 // 100 //
>> 101
76 G4bool G4VoxelLimits::ClipToLimits( G4ThreeVec 102 G4bool G4VoxelLimits::ClipToLimits( G4ThreeVector& pStart,
77 G4ThreeVec 103 G4ThreeVector& pEnd ) const
78 { 104 {
79 G4int sCode, eCode ; 105 G4int sCode, eCode ;
80 G4bool remainsAfterClip ; 106 G4bool remainsAfterClip ;
81 107
82 // Determine if line is trivially inside (bo 108 // Determine if line is trivially inside (both outcodes==0) or outside
83 // (logical AND of outcodes !=0) 109 // (logical AND of outcodes !=0)
84 110
85 sCode = OutCode(pStart) ; 111 sCode = OutCode(pStart) ;
86 eCode = OutCode(pEnd) ; 112 eCode = OutCode(pEnd) ;
87 113
88 if ( (sCode & eCode) != 0 ) << 114 if ( sCode & eCode )
89 { 115 {
90 // Trivially outside, no intersection with 116 // Trivially outside, no intersection with region
91 117
92 remainsAfterClip = false; 118 remainsAfterClip = false;
93 } 119 }
94 else if ( sCode == 0 && eCode == 0 ) 120 else if ( sCode == 0 && eCode == 0 )
95 { 121 {
96 // Trivially inside, no intersections 122 // Trivially inside, no intersections
97 123
98 remainsAfterClip = true ; 124 remainsAfterClip = true ;
99 } 125 }
100 else 126 else
101 { 127 {
102 // Line segment *may* cut volume boundarie 128 // Line segment *may* cut volume boundaries
103 // At most, one end point is inside 129 // At most, one end point is inside
104 130
105 G4double x1, y1, z1, x2, y2, z2 ; 131 G4double x1, y1, z1, x2, y2, z2 ;
106 132
107 x1 = pStart.x() ; 133 x1 = pStart.x() ;
108 y1 = pStart.y() ; 134 y1 = pStart.y() ;
109 z1 = pStart.z() ; 135 z1 = pStart.z() ;
110 136
111 x2 = pEnd.x() ; 137 x2 = pEnd.x() ;
112 y2 = pEnd.y() ; 138 y2 = pEnd.y() ;
113 z2 = pEnd.z() ; 139 z2 = pEnd.z() ;
114 << 140 /*
115 while ( sCode != eCode ) // Loop checking << 141 if( std::abs(x1-x2) < kCarTolerance*kCarTolerance)
>> 142 {
>> 143 G4cout<<"x1 = "<<x1<<"\t"<<"x2 = "<<x2<<G4endl;
>> 144 }
>> 145 if( std::abs(y1-y2) < kCarTolerance*kCarTolerance)
>> 146 {
>> 147 G4cout<<"y1 = "<<y1<<"\t"<<"y2 = "<<y2<<G4endl;
>> 148 }
>> 149 if( std::abs(z1-z2) < kCarTolerance*kCarTolerance)
>> 150 {
>> 151 G4cout<<"z1 = "<<z1<<"\t"<<"z2 = "<<z2<<G4endl;
>> 152 }
>> 153 */
>> 154 while ( sCode != eCode )
116 { 155 {
117 // Copy vectors to work variables x1-z1, 156 // Copy vectors to work variables x1-z1,x2-z2
118 // Ensure x1-z1 lies outside volume, swa 157 // Ensure x1-z1 lies outside volume, swapping vectors and outcodes
119 // if necessary 158 // if necessary
120 159
121 if ( sCode != 0 ) << 160 if ( sCode )
122 { 161 {
123 if ( (sCode & 0x01) != 0 ) // Clip ag << 162 if ( sCode & 0x01 ) // Clip against fxAxisMin
124 { 163 {
125 z1 += (fxAxisMin-x1)*(z2-z1)/(x2-x1) 164 z1 += (fxAxisMin-x1)*(z2-z1)/(x2-x1);
126 y1 += (fxAxisMin-x1)*(y2-y1)/(x2-x1) 165 y1 += (fxAxisMin-x1)*(y2-y1)/(x2-x1);
127 x1 = fxAxisMin; 166 x1 = fxAxisMin;
128 } 167 }
129 else if ( (sCode & 0x02) != 0 ) // Cli << 168 else if ( sCode & 0x02 ) // Clip against fxAxisMax
130 { 169 {
131 z1 += (fxAxisMax-x1)*(z2-z1)/(x2-x1) 170 z1 += (fxAxisMax-x1)*(z2-z1)/(x2-x1);
132 y1 += (fxAxisMax-x1)*(y2-y1)/(x2-x1) 171 y1 += (fxAxisMax-x1)*(y2-y1)/(x2-x1);
133 x1 = fxAxisMax ; 172 x1 = fxAxisMax ;
134 } 173 }
135 else if ( (sCode & 0x04) != 0 ) // Cl << 174 else if ( sCode & 0x04 ) // Clip against fyAxisMin
136 { 175 {
137 x1 += (fyAxisMin-y1)*(x2-x1)/(y2-y1) 176 x1 += (fyAxisMin-y1)*(x2-x1)/(y2-y1);
138 z1 += (fyAxisMin-y1)*(z2-z1)/(y2-y1) 177 z1 += (fyAxisMin-y1)*(z2-z1)/(y2-y1);
139 y1 = fyAxisMin; 178 y1 = fyAxisMin;
140 } 179 }
141 else if ( (sCode & 0x08) != 0 ) // Cl << 180 else if ( sCode & 0x08 ) // Clip against fyAxisMax
142 { 181 {
143 x1 += (fyAxisMax-y1)*(x2-x1)/(y2-y1) 182 x1 += (fyAxisMax-y1)*(x2-x1)/(y2-y1);
144 z1 += (fyAxisMax-y1)*(z2-z1)/(y2-y1) 183 z1 += (fyAxisMax-y1)*(z2-z1)/(y2-y1);
145 y1 = fyAxisMax; 184 y1 = fyAxisMax;
146 } 185 }
147 else if ( (sCode & 0x10) != 0 ) // Cl << 186 else if ( sCode & 0x10 ) // Clip against fzAxisMin
148 { 187 {
149 x1 += (fzAxisMin-z1)*(x2-x1)/(z2-z1) 188 x1 += (fzAxisMin-z1)*(x2-x1)/(z2-z1);
150 y1 += (fzAxisMin-z1)*(y2-y1)/(z2-z1) 189 y1 += (fzAxisMin-z1)*(y2-y1)/(z2-z1);
151 z1 = fzAxisMin; 190 z1 = fzAxisMin;
152 } 191 }
153 else if ( (sCode & 0x20) != 0 ) // Cl << 192 else if ( sCode & 0x20 ) // Clip against fzAxisMax
154 { 193 {
155 x1 += (fzAxisMax-z1)*(x2-x1)/(z2-z1) 194 x1 += (fzAxisMax-z1)*(x2-x1)/(z2-z1);
156 y1 += (fzAxisMax-z1)*(y2-y1)/(z2-z1) 195 y1 += (fzAxisMax-z1)*(y2-y1)/(z2-z1);
157 z1 = fzAxisMax; 196 z1 = fzAxisMax;
158 } 197 }
159 } 198 }
160 if ( eCode != 0 ) // Clip 2nd end: repe << 199 if ( eCode ) // Clip 2nd end: repeat of 1st, but 1<>2
161 { 200 {
162 if ( (eCode & 0x01) != 0 ) // Clip ag << 201 if ( eCode & 0x01 ) // Clip against fxAxisMin
163 { 202 {
164 z2 += (fxAxisMin-x2)*(z1-z2)/(x1-x2) 203 z2 += (fxAxisMin-x2)*(z1-z2)/(x1-x2);
165 y2 += (fxAxisMin-x2)*(y1-y2)/(x1-x2) 204 y2 += (fxAxisMin-x2)*(y1-y2)/(x1-x2);
166 x2 = fxAxisMin; 205 x2 = fxAxisMin;
167 } 206 }
168 else if ( (eCode & 0x02) != 0 ) // Cl << 207 else if ( eCode & 0x02 ) // Clip against fxAxisMax
169 { 208 {
170 z2 += (fxAxisMax-x2)*(z1-z2)/(x1-x2) 209 z2 += (fxAxisMax-x2)*(z1-z2)/(x1-x2);
171 y2 += (fxAxisMax-x2)*(y1-y2)/(x1-x2) 210 y2 += (fxAxisMax-x2)*(y1-y2)/(x1-x2);
172 x2 = fxAxisMax; 211 x2 = fxAxisMax;
173 } 212 }
174 else if ( (eCode & 0x04) != 0 ) // Cl << 213 else if ( eCode & 0x04 ) // Clip against fyAxisMin
175 { 214 {
176 x2 += (fyAxisMin-y2)*(x1-x2)/(y1-y2) 215 x2 += (fyAxisMin-y2)*(x1-x2)/(y1-y2);
177 z2 += (fyAxisMin-y2)*(z1-z2)/(y1-y2) 216 z2 += (fyAxisMin-y2)*(z1-z2)/(y1-y2);
178 y2 = fyAxisMin; 217 y2 = fyAxisMin;
179 } 218 }
180 else if ((eCode&0x08) != 0) // Clip a << 219 else if (eCode&0x08) // Clip against fyAxisMax
181 { 220 {
182 x2 += (fyAxisMax-y2)*(x1-x2)/(y1-y2) 221 x2 += (fyAxisMax-y2)*(x1-x2)/(y1-y2);
183 z2 += (fyAxisMax-y2)*(z1-z2)/(y1-y2) 222 z2 += (fyAxisMax-y2)*(z1-z2)/(y1-y2);
184 y2 = fyAxisMax; 223 y2 = fyAxisMax;
185 } 224 }
186 else if ( (eCode & 0x10) != 0 ) // Cl << 225 else if ( eCode & 0x10 ) // Clip against fzAxisMin
187 { 226 {
188 x2 += (fzAxisMin-z2)*(x1-x2)/(z1-z2) 227 x2 += (fzAxisMin-z2)*(x1-x2)/(z1-z2);
189 y2 += (fzAxisMin-z2)*(y1-y2)/(z1-z2) 228 y2 += (fzAxisMin-z2)*(y1-y2)/(z1-z2);
190 z2 = fzAxisMin; 229 z2 = fzAxisMin;
191 } 230 }
192 else if ( (eCode & 0x20) != 0 ) // Cl << 231 else if ( eCode & 0x20 ) // Clip against fzAxisMax
193 { 232 {
194 x2 += (fzAxisMax-z2)*(x1-x2)/(z1-z2) 233 x2 += (fzAxisMax-z2)*(x1-x2)/(z1-z2);
195 y2 += (fzAxisMax-z2)*(y1-y2)/(z1-z2) 234 y2 += (fzAxisMax-z2)*(y1-y2)/(z1-z2);
196 z2 = fzAxisMax; 235 z2 = fzAxisMax;
197 } 236 }
198 } 237 }
>> 238 // G4endl; G4cout<<"x1 = "<<x1<<"\t"<<"x2 = "<<x2<<G4endl<<G4endl;
199 pStart = G4ThreeVector(x1,y1,z1); 239 pStart = G4ThreeVector(x1,y1,z1);
200 pEnd = G4ThreeVector(x2,y2,z2); 240 pEnd = G4ThreeVector(x2,y2,z2);
201 sCode = OutCode(pStart); 241 sCode = OutCode(pStart);
202 eCode = OutCode(pEnd); 242 eCode = OutCode(pEnd);
203 } 243 }
204 remainsAfterClip = sCode == 0 && eCode == << 244 if ( sCode == 0 && eCode == 0 ) remainsAfterClip = true;
>> 245 else remainsAfterClip = false;
205 } 246 }
206 return remainsAfterClip; 247 return remainsAfterClip;
207 } 248 }
208 249
209 ////////////////////////////////////////////// 250 ////////////////////////////////////////////////////////////////////////////
210 // 251 //
211 // Calculate the `outcode' for the specified v 252 // Calculate the `outcode' for the specified vector:
212 // The following bits are set: 253 // The following bits are set:
213 // 0 pVec.x()<fxAxisMin && IsXLimited() 254 // 0 pVec.x()<fxAxisMin && IsXLimited()
214 // 1 pVec.x()>fxAxisMax && IsXLimited() 255 // 1 pVec.x()>fxAxisMax && IsXLimited()
215 // 2 pVec.y()<fyAxisMin && IsYLimited() 256 // 2 pVec.y()<fyAxisMin && IsYLimited()
216 // 3 pVec.y()>fyAxisMax && IsYLimited() 257 // 3 pVec.y()>fyAxisMax && IsYLimited()
217 // 4 pVec.z()<fzAxisMin && IsZLimited() 258 // 4 pVec.z()<fzAxisMin && IsZLimited()
218 // 5 pVec.z()>fzAxisMax && IsZLimited() 259 // 5 pVec.z()>fzAxisMax && IsZLimited()
219 // 260 //
>> 261
220 G4int G4VoxelLimits::OutCode( const G4ThreeVec 262 G4int G4VoxelLimits::OutCode( const G4ThreeVector& pVec ) const
221 { 263 {
222 G4int code = 0 ; // The outco 264 G4int code = 0 ; // The outcode
223 265
224 if ( IsXLimited() ) 266 if ( IsXLimited() )
225 { 267 {
226 if ( pVec.x() < fxAxisMin ) code |= 0x01 ; 268 if ( pVec.x() < fxAxisMin ) code |= 0x01 ;
227 if ( pVec.x() > fxAxisMax ) code |= 0x02 ; 269 if ( pVec.x() > fxAxisMax ) code |= 0x02 ;
228 } 270 }
229 if ( IsYLimited() ) 271 if ( IsYLimited() )
230 { 272 {
231 if ( pVec.y() < fyAxisMin ) code |= 0x04 ; 273 if ( pVec.y() < fyAxisMin ) code |= 0x04 ;
232 if ( pVec.y() > fyAxisMax ) code |= 0x08 ; 274 if ( pVec.y() > fyAxisMax ) code |= 0x08 ;
233 } 275 }
234 if (IsZLimited()) 276 if (IsZLimited())
235 { 277 {
236 if ( pVec.z() < fzAxisMin ) code |= 0x10 ; 278 if ( pVec.z() < fzAxisMin ) code |= 0x10 ;
237 if ( pVec.z() > fzAxisMax ) code |= 0x20 ; 279 if ( pVec.z() > fzAxisMax ) code |= 0x20 ;
238 } 280 }
239 return code; 281 return code;
240 } 282 }
241 283
242 ////////////////////////////////////////////// 284 ///////////////////////////////////////////////////////////////////////////////
243 285
244 std::ostream& operator << (std::ostream& os, c 286 std::ostream& operator << (std::ostream& os, const G4VoxelLimits& pLim)
245 { 287 {
246 os << "{"; 288 os << "{";
247 if (pLim.IsXLimited()) 289 if (pLim.IsXLimited())
248 { 290 {
249 os << "(" << pLim.GetMinXExtent() 291 os << "(" << pLim.GetMinXExtent()
250 << "," << pLim.GetMaxXExtent() 292 << "," << pLim.GetMaxXExtent() << ") ";
251 } 293 }
252 else 294 else
253 { 295 {
254 os << "(-,-) "; 296 os << "(-,-) ";
255 } 297 }
256 if (pLim.IsYLimited()) 298 if (pLim.IsYLimited())
257 { 299 {
258 os << "(" << pLim.GetMinYExtent() 300 os << "(" << pLim.GetMinYExtent()
259 << "," << pLim.GetMaxYExtent() 301 << "," << pLim.GetMaxYExtent() << ") ";
260 } 302 }
261 else 303 else
262 { 304 {
263 os << "(-,-) "; 305 os << "(-,-) ";
264 } 306 }
265 if (pLim.IsZLimited()) 307 if (pLim.IsZLimited())
266 { 308 {
267 os << "(" << pLim.GetMinZExtent() 309 os << "(" << pLim.GetMinZExtent()
268 << "," << pLim.GetMaxZExtent() 310 << "," << pLim.GetMaxZExtent() << ")";
269 } 311 }
270 else 312 else
271 { 313 {
272 os << "(-,-)"; 314 os << "(-,-)";
273 } 315 }
274 os << "}"; 316 os << "}";
275 return os; 317 return os;
276 } 318 }
277 319