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25 // 22 //
26 // Class G4VoxelLimits implementation <<
27 // 23 //
28 // 13.07.95, P.Kent - Initial version << 24 // $Id: G4VoxelLimits.cc,v 1.9 2003/11/02 14:01:24 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-06-00-patch-01 $
>> 26 //
>> 27 // class G4VoxelLimits
>> 28 //
>> 29 // Implementation
>> 30 //
>> 31 // History:
>> 32 //
>> 33 // 14.03.02 V. Grichine, cosmetics
>> 34 // 13.07.95 P.Kent Initial version
29 // ------------------------------------------- 35 // --------------------------------------------------------------------
30 36
31 #include "G4VoxelLimits.hh" 37 #include "G4VoxelLimits.hh"
32 38
33 #include "G4ios.hh" 39 #include "G4ios.hh"
34 40
35 ////////////////////////////////////////////// 41 ///////////////////////////////////////////////////////////////////////////
36 // 42 //
>> 43 // Empty constructor and destructor
>> 44 //
>> 45
>> 46 G4VoxelLimits::G4VoxelLimits()
>> 47 : fxAxisMin(-kInfinity),fxAxisMax(kInfinity),
>> 48 fyAxisMin(-kInfinity),fyAxisMax(kInfinity),
>> 49 fzAxisMin(-kInfinity),fzAxisMax(kInfinity)
>> 50 {
>> 51 }
>> 52
>> 53 G4VoxelLimits::~G4VoxelLimits()
>> 54 {
>> 55 }
>> 56
>> 57 ///////////////////////////////////////////////////////////////////////////
>> 58 //
37 // Further restrict limits 59 // Further restrict limits
38 // No checks for illegal restrictions 60 // No checks for illegal restrictions
39 // 61 //
>> 62
40 void G4VoxelLimits::AddLimit( const EAxis pAxi 63 void G4VoxelLimits::AddLimit( const EAxis pAxis,
41 const G4double p 64 const G4double pMin,
42 const G4double p 65 const G4double pMax )
43 { 66 {
44 if ( pAxis == kXAxis ) 67 if ( pAxis == kXAxis )
45 { 68 {
46 if ( pMin > fxAxisMin ) fxAxisMin = pMin ; 69 if ( pMin > fxAxisMin ) fxAxisMin = pMin ;
47 if ( pMax < fxAxisMax ) fxAxisMax = pMax ; 70 if ( pMax < fxAxisMax ) fxAxisMax = pMax ;
48 } 71 }
49 else if ( pAxis == kYAxis ) 72 else if ( pAxis == kYAxis )
50 { 73 {
51 if ( pMin > fyAxisMin ) fyAxisMin = pMin ; 74 if ( pMin > fyAxisMin ) fyAxisMin = pMin ;
52 if ( pMax < fyAxisMax ) fyAxisMax = pMax ; 75 if ( pMax < fyAxisMax ) fyAxisMax = pMax ;
53 } 76 }
54 else 77 else
55 { 78 {
56 assert( pAxis == kZAxis ) ; 79 assert( pAxis == kZAxis ) ;
57 80
58 if ( pMin > fzAxisMin ) fzAxisMin = pMin ; 81 if ( pMin > fzAxisMin ) fzAxisMin = pMin ;
59 if ( pMax < fzAxisMax ) fzAxisMax = pMax ; 82 if ( pMax < fzAxisMax ) fzAxisMax = pMax ;
60 } 83 }
61 } 84 }
62 85
63 ////////////////////////////////////////////// 86 ///////////////////////////////////////////////////////////////////////////
64 // 87 //
65 // ClipToLimits 88 // ClipToLimits
66 // 89 //
67 // Clip the line segment pStart->pEnd to the v 90 // Clip the line segment pStart->pEnd to the volume described by the
68 // current limits. Return true if the line rem 91 // current limits. Return true if the line remains after clipping,
69 // else false, and leave the vectors in an und 92 // else false, and leave the vectors in an undefined state.
70 // 93 //
71 // Process: 94 // Process:
72 // 95 //
73 // Use Cohen-Sutherland clipping in 3D 96 // Use Cohen-Sutherland clipping in 3D
74 // [Fundamentals of Interactive Computer Graph 97 // [Fundamentals of Interactive Computer Graphics,Foley & Van Dam]
75 // 98 //
>> 99
76 G4bool G4VoxelLimits::ClipToLimits( G4ThreeVec 100 G4bool G4VoxelLimits::ClipToLimits( G4ThreeVector& pStart,
77 G4ThreeVec 101 G4ThreeVector& pEnd ) const
78 { 102 {
79 G4int sCode, eCode ; 103 G4int sCode, eCode ;
80 G4bool remainsAfterClip ; 104 G4bool remainsAfterClip ;
81 105
82 // Determine if line is trivially inside (bo 106 // Determine if line is trivially inside (both outcodes==0) or outside
83 // (logical AND of outcodes !=0) 107 // (logical AND of outcodes !=0)
84 108
85 sCode = OutCode(pStart) ; 109 sCode = OutCode(pStart) ;
86 eCode = OutCode(pEnd) ; 110 eCode = OutCode(pEnd) ;
87 111
88 if ( (sCode & eCode) != 0 ) << 112 if ( sCode & eCode )
89 { 113 {
90 // Trivially outside, no intersection with 114 // Trivially outside, no intersection with region
91 115
92 remainsAfterClip = false; 116 remainsAfterClip = false;
93 } 117 }
94 else if ( sCode == 0 && eCode == 0 ) 118 else if ( sCode == 0 && eCode == 0 )
95 { 119 {
96 // Trivially inside, no intersections 120 // Trivially inside, no intersections
97 121
98 remainsAfterClip = true ; 122 remainsAfterClip = true ;
99 } 123 }
100 else 124 else
101 { 125 {
102 // Line segment *may* cut volume boundarie 126 // Line segment *may* cut volume boundaries
103 // At most, one end point is inside 127 // At most, one end point is inside
104 128
105 G4double x1, y1, z1, x2, y2, z2 ; 129 G4double x1, y1, z1, x2, y2, z2 ;
106 130
107 x1 = pStart.x() ; 131 x1 = pStart.x() ;
108 y1 = pStart.y() ; 132 y1 = pStart.y() ;
109 z1 = pStart.z() ; 133 z1 = pStart.z() ;
110 134
111 x2 = pEnd.x() ; 135 x2 = pEnd.x() ;
112 y2 = pEnd.y() ; 136 y2 = pEnd.y() ;
113 z2 = pEnd.z() ; 137 z2 = pEnd.z() ;
114 << 138 /*
115 while ( sCode != eCode ) // Loop checking << 139 if( abs(x1-x2) < kCarTolerance*kCarTolerance)
>> 140 {
>> 141 G4cout<<"x1 = "<<x1<<"\t"<<"x2 = "<<x2<<G4endl;
>> 142 }
>> 143 if( abs(y1-y2) < kCarTolerance*kCarTolerance)
>> 144 {
>> 145 G4cout<<"y1 = "<<y1<<"\t"<<"y2 = "<<y2<<G4endl;
>> 146 }
>> 147 if( abs(z1-z2) < kCarTolerance*kCarTolerance)
>> 148 {
>> 149 G4cout<<"z1 = "<<z1<<"\t"<<"z2 = "<<z2<<G4endl;
>> 150 }
>> 151 */
>> 152 while ( sCode != eCode )
116 { 153 {
117 // Copy vectors to work variables x1-z1, 154 // Copy vectors to work variables x1-z1,x2-z2
118 // Ensure x1-z1 lies outside volume, swa 155 // Ensure x1-z1 lies outside volume, swapping vectors and outcodes
119 // if necessary 156 // if necessary
120 157
121 if ( sCode != 0 ) << 158 if ( sCode )
122 { 159 {
123 if ( (sCode & 0x01) != 0 ) // Clip ag << 160 if ( sCode & 0x01 ) // Clip against fxAxisMin
124 { 161 {
125 z1 += (fxAxisMin-x1)*(z2-z1)/(x2-x1) 162 z1 += (fxAxisMin-x1)*(z2-z1)/(x2-x1);
126 y1 += (fxAxisMin-x1)*(y2-y1)/(x2-x1) 163 y1 += (fxAxisMin-x1)*(y2-y1)/(x2-x1);
127 x1 = fxAxisMin; 164 x1 = fxAxisMin;
128 } 165 }
129 else if ( (sCode & 0x02) != 0 ) // Cli << 166 else if ( sCode & 0x02 ) // Clip against fxAxisMax
130 { 167 {
131 z1 += (fxAxisMax-x1)*(z2-z1)/(x2-x1) 168 z1 += (fxAxisMax-x1)*(z2-z1)/(x2-x1);
132 y1 += (fxAxisMax-x1)*(y2-y1)/(x2-x1) 169 y1 += (fxAxisMax-x1)*(y2-y1)/(x2-x1);
133 x1 = fxAxisMax ; 170 x1 = fxAxisMax ;
134 } 171 }
135 else if ( (sCode & 0x04) != 0 ) // Cl << 172 else if ( sCode & 0x04 ) // Clip against fyAxisMin
136 { 173 {
137 x1 += (fyAxisMin-y1)*(x2-x1)/(y2-y1) 174 x1 += (fyAxisMin-y1)*(x2-x1)/(y2-y1);
138 z1 += (fyAxisMin-y1)*(z2-z1)/(y2-y1) 175 z1 += (fyAxisMin-y1)*(z2-z1)/(y2-y1);
139 y1 = fyAxisMin; 176 y1 = fyAxisMin;
140 } 177 }
141 else if ( (sCode & 0x08) != 0 ) // Cl << 178 else if ( sCode & 0x08 ) // Clip against fyAxisMax
142 { 179 {
143 x1 += (fyAxisMax-y1)*(x2-x1)/(y2-y1) 180 x1 += (fyAxisMax-y1)*(x2-x1)/(y2-y1);
144 z1 += (fyAxisMax-y1)*(z2-z1)/(y2-y1) 181 z1 += (fyAxisMax-y1)*(z2-z1)/(y2-y1);
145 y1 = fyAxisMax; 182 y1 = fyAxisMax;
146 } 183 }
147 else if ( (sCode & 0x10) != 0 ) // Cl << 184 else if ( sCode & 0x10 ) // Clip against fzAxisMin
148 { 185 {
149 x1 += (fzAxisMin-z1)*(x2-x1)/(z2-z1) 186 x1 += (fzAxisMin-z1)*(x2-x1)/(z2-z1);
150 y1 += (fzAxisMin-z1)*(y2-y1)/(z2-z1) 187 y1 += (fzAxisMin-z1)*(y2-y1)/(z2-z1);
151 z1 = fzAxisMin; 188 z1 = fzAxisMin;
152 } 189 }
153 else if ( (sCode & 0x20) != 0 ) // Cl << 190 else if ( sCode & 0x20 ) // Clip against fzAxisMax
154 { 191 {
155 x1 += (fzAxisMax-z1)*(x2-x1)/(z2-z1) 192 x1 += (fzAxisMax-z1)*(x2-x1)/(z2-z1);
156 y1 += (fzAxisMax-z1)*(y2-y1)/(z2-z1) 193 y1 += (fzAxisMax-z1)*(y2-y1)/(z2-z1);
157 z1 = fzAxisMax; 194 z1 = fzAxisMax;
158 } 195 }
159 } 196 }
160 if ( eCode != 0 ) // Clip 2nd end: repe << 197 if ( eCode ) // Clip 2nd end: repeat of 1st, but 1<>2
161 { 198 {
162 if ( (eCode & 0x01) != 0 ) // Clip ag << 199 if ( eCode & 0x01 ) // Clip against fxAxisMin
163 { 200 {
164 z2 += (fxAxisMin-x2)*(z1-z2)/(x1-x2) 201 z2 += (fxAxisMin-x2)*(z1-z2)/(x1-x2);
165 y2 += (fxAxisMin-x2)*(y1-y2)/(x1-x2) 202 y2 += (fxAxisMin-x2)*(y1-y2)/(x1-x2);
166 x2 = fxAxisMin; 203 x2 = fxAxisMin;
167 } 204 }
168 else if ( (eCode & 0x02) != 0 ) // Cl << 205 else if ( eCode & 0x02 ) // Clip against fxAxisMax
169 { 206 {
170 z2 += (fxAxisMax-x2)*(z1-z2)/(x1-x2) 207 z2 += (fxAxisMax-x2)*(z1-z2)/(x1-x2);
171 y2 += (fxAxisMax-x2)*(y1-y2)/(x1-x2) 208 y2 += (fxAxisMax-x2)*(y1-y2)/(x1-x2);
172 x2 = fxAxisMax; 209 x2 = fxAxisMax;
173 } 210 }
174 else if ( (eCode & 0x04) != 0 ) // Cl << 211 else if ( eCode & 0x04 ) // Clip against fyAxisMin
175 { 212 {
176 x2 += (fyAxisMin-y2)*(x1-x2)/(y1-y2) 213 x2 += (fyAxisMin-y2)*(x1-x2)/(y1-y2);
177 z2 += (fyAxisMin-y2)*(z1-z2)/(y1-y2) 214 z2 += (fyAxisMin-y2)*(z1-z2)/(y1-y2);
178 y2 = fyAxisMin; 215 y2 = fyAxisMin;
179 } 216 }
180 else if ((eCode&0x08) != 0) // Clip a << 217 else if (eCode&0x08) // Clip against fyAxisMax
181 { 218 {
182 x2 += (fyAxisMax-y2)*(x1-x2)/(y1-y2) 219 x2 += (fyAxisMax-y2)*(x1-x2)/(y1-y2);
183 z2 += (fyAxisMax-y2)*(z1-z2)/(y1-y2) 220 z2 += (fyAxisMax-y2)*(z1-z2)/(y1-y2);
184 y2 = fyAxisMax; 221 y2 = fyAxisMax;
185 } 222 }
186 else if ( (eCode & 0x10) != 0 ) // Cl << 223 else if ( eCode & 0x10 ) // Clip against fzAxisMin
187 { 224 {
188 x2 += (fzAxisMin-z2)*(x1-x2)/(z1-z2) 225 x2 += (fzAxisMin-z2)*(x1-x2)/(z1-z2);
189 y2 += (fzAxisMin-z2)*(y1-y2)/(z1-z2) 226 y2 += (fzAxisMin-z2)*(y1-y2)/(z1-z2);
190 z2 = fzAxisMin; 227 z2 = fzAxisMin;
191 } 228 }
192 else if ( (eCode & 0x20) != 0 ) // Cl << 229 else if ( eCode & 0x20 ) // Clip against fzAxisMax
193 { 230 {
194 x2 += (fzAxisMax-z2)*(x1-x2)/(z1-z2) 231 x2 += (fzAxisMax-z2)*(x1-x2)/(z1-z2);
195 y2 += (fzAxisMax-z2)*(y1-y2)/(z1-z2) 232 y2 += (fzAxisMax-z2)*(y1-y2)/(z1-z2);
196 z2 = fzAxisMax; 233 z2 = fzAxisMax;
197 } 234 }
198 } 235 }
>> 236 // G4endl; G4cout<<"x1 = "<<x1<<"\t"<<"x2 = "<<x2<<G4endl<<G4endl;
199 pStart = G4ThreeVector(x1,y1,z1); 237 pStart = G4ThreeVector(x1,y1,z1);
200 pEnd = G4ThreeVector(x2,y2,z2); 238 pEnd = G4ThreeVector(x2,y2,z2);
201 sCode = OutCode(pStart); 239 sCode = OutCode(pStart);
202 eCode = OutCode(pEnd); 240 eCode = OutCode(pEnd);
203 } 241 }
204 remainsAfterClip = sCode == 0 && eCode == << 242 if ( sCode == 0 && eCode == 0 ) remainsAfterClip = true;
>> 243 else remainsAfterClip = false;
205 } 244 }
206 return remainsAfterClip; 245 return remainsAfterClip;
207 } 246 }
208 247
209 ////////////////////////////////////////////// 248 ////////////////////////////////////////////////////////////////////////////
210 // 249 //
211 // Calculate the `outcode' for the specified v 250 // Calculate the `outcode' for the specified vector:
212 // The following bits are set: 251 // The following bits are set:
213 // 0 pVec.x()<fxAxisMin && IsXLimited() 252 // 0 pVec.x()<fxAxisMin && IsXLimited()
214 // 1 pVec.x()>fxAxisMax && IsXLimited() 253 // 1 pVec.x()>fxAxisMax && IsXLimited()
215 // 2 pVec.y()<fyAxisMin && IsYLimited() 254 // 2 pVec.y()<fyAxisMin && IsYLimited()
216 // 3 pVec.y()>fyAxisMax && IsYLimited() 255 // 3 pVec.y()>fyAxisMax && IsYLimited()
217 // 4 pVec.z()<fzAxisMin && IsZLimited() 256 // 4 pVec.z()<fzAxisMin && IsZLimited()
218 // 5 pVec.z()>fzAxisMax && IsZLimited() 257 // 5 pVec.z()>fzAxisMax && IsZLimited()
219 // 258 //
>> 259
220 G4int G4VoxelLimits::OutCode( const G4ThreeVec 260 G4int G4VoxelLimits::OutCode( const G4ThreeVector& pVec ) const
221 { 261 {
222 G4int code = 0 ; // The outco 262 G4int code = 0 ; // The outcode
223 263
224 if ( IsXLimited() ) 264 if ( IsXLimited() )
225 { 265 {
226 if ( pVec.x() < fxAxisMin ) code |= 0x01 ; 266 if ( pVec.x() < fxAxisMin ) code |= 0x01 ;
227 if ( pVec.x() > fxAxisMax ) code |= 0x02 ; 267 if ( pVec.x() > fxAxisMax ) code |= 0x02 ;
228 } 268 }
229 if ( IsYLimited() ) 269 if ( IsYLimited() )
230 { 270 {
231 if ( pVec.y() < fyAxisMin ) code |= 0x04 ; 271 if ( pVec.y() < fyAxisMin ) code |= 0x04 ;
232 if ( pVec.y() > fyAxisMax ) code |= 0x08 ; 272 if ( pVec.y() > fyAxisMax ) code |= 0x08 ;
233 } 273 }
234 if (IsZLimited()) 274 if (IsZLimited())
235 { 275 {
236 if ( pVec.z() < fzAxisMin ) code |= 0x10 ; 276 if ( pVec.z() < fzAxisMin ) code |= 0x10 ;
237 if ( pVec.z() > fzAxisMax ) code |= 0x20 ; 277 if ( pVec.z() > fzAxisMax ) code |= 0x20 ;
238 } 278 }
239 return code; 279 return code;
240 } 280 }
241 281
242 ////////////////////////////////////////////// 282 ///////////////////////////////////////////////////////////////////////////////
243 283
244 std::ostream& operator << (std::ostream& os, c 284 std::ostream& operator << (std::ostream& os, const G4VoxelLimits& pLim)
245 { 285 {
246 os << "{"; 286 os << "{";
247 if (pLim.IsXLimited()) 287 if (pLim.IsXLimited())
248 { 288 {
249 os << "(" << pLim.GetMinXExtent() 289 os << "(" << pLim.GetMinXExtent()
250 << "," << pLim.GetMaxXExtent() 290 << "," << pLim.GetMaxXExtent() << ") ";
251 } 291 }
252 else 292 else
253 { 293 {
254 os << "(-,-) "; 294 os << "(-,-) ";
255 } 295 }
256 if (pLim.IsYLimited()) 296 if (pLim.IsYLimited())
257 { 297 {
258 os << "(" << pLim.GetMinYExtent() 298 os << "(" << pLim.GetMinYExtent()
259 << "," << pLim.GetMaxYExtent() 299 << "," << pLim.GetMaxYExtent() << ") ";
260 } 300 }
261 else 301 else
262 { 302 {
263 os << "(-,-) "; 303 os << "(-,-) ";
264 } 304 }
265 if (pLim.IsZLimited()) 305 if (pLim.IsZLimited())
266 { 306 {
267 os << "(" << pLim.GetMinZExtent() 307 os << "(" << pLim.GetMinZExtent()
268 << "," << pLim.GetMaxZExtent() 308 << "," << pLim.GetMaxZExtent() << ")";
269 } 309 }
270 else 310 else
271 { 311 {
272 os << "(-,-)"; 312 os << "(-,-)";
273 } 313 }
274 os << "}"; 314 os << "}";
275 return os; 315 return os;
276 } 316 }
277 317