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JMARKOV::JPhotonPath Class Reference

A photon path. More...

#include <JPhotonPath.hh>

Inheritance diagram for JMARKOV::JPhotonPath:
JGEOMETRY3D::JPolyline3D JIO::JSerialisable std::vector< JGEOMETRY3D::JPosition3D >

Public Member Functions

 JPhotonPath ()
 default constructor More...
 
 JPhotonPath (int _nscat)
 constructor to actually be used More...
 
string getString ()
 get a string with the path vertex positions More...
 
double getLength ()
 get the total path length More...
 
void addVertex ()
 
void addVertex (JPosition3D &pos)
 
bool hitsSphere (const JPosition3D &pos, double r)
 Returns whether the photon path intersects a sphere of radius r at position pos. More...
 
JPosition3D getSphereHitPosition (const JPosition3D &pos, double r)
 Returns the position where the photon hits a sphere of radius r at position pos. If the photon does not hit, it returns (0,0,0). More...
 
std::vector< JPosition3D > getPointsWithX (double x)
 return all coordinates where the photon path has the given x More...
 
std::vector< JPosition3D > getPointsWithY (double y)
 return all coordinates where the photon path has the given y More...
 
std::vector< JPosition3D > getPointsWithZ (double z)
 return all coordinates where the photon path has the given z More...
 
JIO::JReader & read (JIO::JReader &in)
 Read from input. More...
 
JIO::JWriter & write (JIO::JWriter &out) const
 Write to output. More...
 
const JPolyline3D & getPolyline () const
 Get polyline. More...
 
JPolyline3D & getPolyline ()
 Get polyline. More...
 
JPolyline3D & transform (const JMatrix3D &T)
 Transform all vertices. More...
 
void transform (const JRotation3D &R, const JVector3D &pos)
 Transform all vertices of the polyline with a rotation and offset. More...
 
JPolyline3D & rotate (const JRotation3D &R)
 Rotate all vertices. More...
 
JPolyline3D & rotate (const JRotation3X &R)
 Rotate all vertices around X-axis. More...
 
JPolyline3D & rotate (const JRotation3Y &R)
 Rotate all vertices around Y-axis. More...
 
JPolyline3D & rotate (const JRotation3Z &R)
 Rotate all vertices around Z-axis. More...
 
JPolyline3D & rotate_back (const JRotation3D &R)
 Rotate back all vertices. More...
 
JPolyline3D & rotate_back (const JRotation3X &R)
 Rotate all vertices back around X-axis. More...
 
JPolyline3D & rotate_back (const JRotation3Y &R)
 Rotate all vertices back around Y-axis. More...
 
JPolyline3D & rotate_back (const JRotation3Z &R)
 Rotate all vertices back around Z-axis. More...
 
void transform_back (const JRotation3D &R, const JVector3D &pos)
 Transform back all vertices of the polyline. More...
 

Public Attributes

int n
 
double weight
 

Detailed Description

A photon path.

This is basically a JPolyline3D with at least two vertices and a weight.

Definition at line 38 of file JPhotonPath.hh.

Constructor & Destructor Documentation

JMARKOV::JPhotonPath::JPhotonPath ( )
inline

default constructor

Definition at line 42 of file JPhotonPath.hh.

42 : n(2), weight(1) { resize(n) ; }
JMARKOV::JPhotonPath::JPhotonPath ( int  _nscat)
inline

constructor to actually be used

Definition at line 45 of file JPhotonPath.hh.

45 : n(_nscat+2), weight(1) { resize(n) ; }

Member Function Documentation

string JMARKOV::JPhotonPath::getString ( )

get a string with the path vertex positions

Definition at line 136 of file JPhotonPath.hh.

136  {
137  ostringstream oss ;
138  for( unsigned int i=0 ; i<size() ; ++i ) {
139  oss << at(i) ;
140  if( i+1!=size() ) oss << ", " ;
141  }
142  return oss.str() ;
143  }
double JMARKOV::JPhotonPath::getLength ( )

get the total path length

Definition at line 104 of file JPhotonPath.hh.

104  {
105  iterator v1 = begin() ;
106  iterator v2(v1) ;
107  ++v2 ;
108  double L = 0 ;
109  for( ; v2!=end() ; ++v1,++v2 ) {
110  // length of path segment
111  L += (*v2-*v1).getLength() ;
112  }
113  return L ;
114  }
JMARKOV::JPhotonPath::getLength
double getLength()
get the total path length
Definition: JPhotonPath.hh:104
void JMARKOV::JPhotonPath::addVertex ( )
inline

Definition at line 53 of file JPhotonPath.hh.

53  {
54  JPosition3D pos(0,0,0) ;
55  addVertex(pos) ;
56  }
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
void JMARKOV::JPhotonPath::addVertex ( JPosition3D &  pos)

Definition at line 116 of file JPhotonPath.hh.

116  {
117  ++n ;
118  push_back(pos) ;
119  }
bool JMARKOV::JPhotonPath::hitsSphere ( const JPosition3D &  pos,
double  r 
)

Returns whether the photon path intersects a sphere of radius r at position pos.

Definition at line 176 of file JPhotonPath.hh.

176  {
177  // loop over the path segments
178  for( unsigned int i=1 ; i<size() ; ++i ) {
179  // the current path segment is from x1 to x2
180 
181  // vector pointing from x1 to x2
182  JPosition3D seg = at(i)-at(i-1) ;
183  JVersor3D dir_seg(seg) ; // normalized version of seg
184  double Lseg = seg.getLength() ;
185 
186  // vector pointing from the center of the sphere to x1
187  JPosition3D to_center(at(i-1)-pos) ;
188  JVersor3D dir_to_center(to_center) ; // normalized version of to_center
189  double r_to_center = to_center.getLength() ;
190 
191  // cosine of angle between the two directions
192  double ct = dir_seg.getDot(dir_to_center) ;
193 
194  // if sin^2(theta) > (r_to_center/radius)^2
195  if( 1-ct*ct > r*r/(r_to_center*r_to_center) ) {
196  // definitely no hit in this segment
197  // continue with the next one
198  continue ;
199  }
200 
201  // the segment can be parametrized as x1 + xi * dir_seg
202  // where xi is in the range [0,Lseg]
203  // there are two possible solutions for xi
204  double D = sqrt( r_to_center*r_to_center*(ct*ct-1) + r*r ) ;
205  double xi1 = -r_to_center*ct + D ;
206  if( xi1>0 && xi1<Lseg ) return true ;
207  double xi2 = -r_to_center*ct - D ;
208  if( xi2>0 && xi2<Lseg ) return true ;
209  }
210  return false ;
211  }
JTOOLS::r
data_type r[M+1]
Definition: JPolint.hh:742
continue
skip continue
Definition: JTuneHV.sh:92
JGEOMETRY3D::JVector3D::getLength
double getLength() const
Get length.
Definition: JVector3D.hh:246
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
JGEOMETRY3D::JVersor3D
Data structure for normalised vector in three dimensions.
Definition: JVersor3D.hh:26
D
do echo Generating $dir eval D
Definition: JDrawLED.sh:53
JPosition3D JMARKOV::JPhotonPath::getSphereHitPosition ( const JPosition3D &  pos,
double  r 
)

Returns the position where the photon hits a sphere of radius r at position pos. If the photon does not hit, it returns (0,0,0).

Definition at line 213 of file JPhotonPath.hh.

213  {
214  // loop over the path segments
215  for( unsigned int i=1 ; i<size() ; ++i ) {
216  // the current path segment is from x1 to x2
217 
218  // vector pointing from x1 to x2
219  JPosition3D seg = at(i)-at(i-1) ;
220  JVersor3D dir_seg(seg) ; // normalized version of seg
221  double Lseg = seg.getLength() ;
222 
223  // vector pointing from the center of the sphere to x1
224  JPosition3D to_center(at(i-1)-pos) ;
225  JVersor3D dir_to_center(to_center) ; // normalized version of to_center
226  double r_to_center = to_center.getLength() ;
227 
228  // cosine of angle between the two directions
229  double ct = dir_seg.getDot(dir_to_center) ;
230 
231  // if sin^2(theta) > (r_to_center/radius)^2
232  if( 1-ct*ct > r*r/(r_to_center*r_to_center) ) {
233  // definitely no hit in this segment
234  // continue with the next one
235  continue ;
236  }
237 
238  // the segment can be parametrized as x1 + xi * dir_seg
239  // where xi is in the range [0,Lseg]
240  // there are two possible solutions for xi
241  double D = sqrt( r_to_center*r_to_center*(ct*ct-1) + r*r ) ;
242 
243  // first xi
244  double xi1 = -r_to_center*ct + D ;
245  if( xi1<0 || xi1>Lseg ) {
246  xi1 = 1.1*Lseg ;
247  }
248 
249  // second xi
250  double xi2 = -r_to_center*ct - D ;
251  // if this is a xi within the segment
252  if( xi2>0 && xi2<Lseg ) {
253  // and it is before xi1, we replace xi1
254  if( xi2<xi1 ) xi1 = xi2 ;
255  }
256 
257  if( xi1>0 && xi1<Lseg ) {
258  return at(i-1) + JPosition3D(dir_seg)*xi1 ;
259  }
260  }
261  return JPosition3D(0,0,0) ;
262  }
JTOOLS::r
data_type r[M+1]
Definition: JPolint.hh:742
continue
skip continue
Definition: JTuneHV.sh:92
JGEOMETRY3D::JVector3D::getLength
double getLength() const
Get length.
Definition: JVector3D.hh:246
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
JGEOMETRY3D::JVersor3D
Data structure for normalised vector in three dimensions.
Definition: JVersor3D.hh:26
D
do echo Generating $dir eval D
Definition: JDrawLED.sh:53
std::vector< JPosition3D > JMARKOV::JPhotonPath::getPointsWithX ( double  x)

return all coordinates where the photon path has the given x

Definition at line 121 of file JPhotonPath.hh.

121  {
122  std::vector<JPosition3D> res ;
123 
124  // loop over the path segments
125  for( unsigned int i=1 ; i<size() ; ++i ) {
126  JPosition3D v1( at(i-1) ) ;
127  JPosition3D v2( at(i) ) ;
128  if( (v1.getX()>x) != (v2.getX()>x) ) {
129  double frac = (x-v1.getX())/(v2.getX()-v1.getX()) ;
130  res.push_back( v1+frac*(v2-v1) ) ;
131  }
132  }
133  return res ;
134  }
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
std::vector< JPosition3D > JMARKOV::JPhotonPath::getPointsWithY ( double  y)

return all coordinates where the photon path has the given y

Definition at line 145 of file JPhotonPath.hh.

145  {
146  std::vector<JPosition3D> res ;
147 
148  // loop over the path segments
149  for( unsigned int i=1 ; i<size() ; ++i ) {
150  JPosition3D v1( at(i-1) ) ;
151  JPosition3D v2( at(i) ) ;
152  if( (v1.getY()>y) != (v2.getY()>y) ) {
153  double frac = (y-v1.getY())/(v2.getY()-v1.getY()) ;
154  res.push_back( v1+frac*(v2-v1) ) ;
155  }
156  }
157  return res ;
158  }
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
std::vector< JPosition3D > JMARKOV::JPhotonPath::getPointsWithZ ( double  z)

return all coordinates where the photon path has the given z

Definition at line 160 of file JPhotonPath.hh.

160  {
161  std::vector<JPosition3D> res ;
162 
163  // loop over the path segments
164  for( unsigned int i=1 ; i<size() ; ++i ) {
165  JPosition3D v1( at(i-1) ) ;
166  JPosition3D v2( at(i) ) ;
167  if( (v1.getZ()>z) != (v2.getZ()>z) ) {
168  double frac = (z-v1.getZ())/(v2.getZ()-v1.getZ()) ;
169  res.push_back( v1+frac*(v2-v1) ) ;
170  }
171  }
172  return res ;
173  }
JGEOMETRY3D::JPosition3D
Data structure for position in three dimensions.
Definition: JPosition3D.hh:36
JIO::JReader& JMARKOV::JPhotonPath::read ( JIO::JReader &  in)
inlinevirtual

Read from input.

Parameters
inJReader
Returns
JReader

Implements JIO::JSerialisable.

Definition at line 75 of file JPhotonPath.hh.

75  {
76  // read number of vertices and adjust size accordingly
77  in >> n ;
78  if( n>0 ) resize(n) ;
79  // read vertices
80  for( iterator it=begin() ; it!=end() ; ++it )
81  in >> *it ;
82  // read weight
83  in >> weight ;
84 
85  return in ;
86  }
in
then fatal Wrong number of arguments fi set_variable DETECTOR $argv[1] set_variable INPUT_FILE $argv[2] eval JPrintDetector a $DETECTOR O IDENTIFIER eval JPrintDetector a $DETECTOR O SUMMARY source JAcoustics sh $DETECTOR_ID CHECK_EXIT_CODE typeset A TRIPODS get_tripods $WORKDIR tripod txt TRIPODS for EMITTER in
Definition: JCanberra.sh:41
JIO::JWriter& JMARKOV::JPhotonPath::write ( JIO::JWriter &  out) const
inlinevirtual

Write to output.

Parameters
outJWriter
Returns
JWriter

Implements JIO::JSerialisable.

Definition at line 88 of file JPhotonPath.hh.

88  {
89  // write size
90  out << (int)size() ;
91  // write vertices
92  for( const_iterator it=begin() ; it!=end() ; ++it )
93  out << *it ; //it->getX() << it->getY() << it->getZ() ;
94  // write weight
95  out << weight ;
96 
97  return out ;
98  }
const JPolyline3D& JGEOMETRY3D::JPolyline3D::getPolyline ( ) const
inlineinherited

Get polyline.

Returns
polyline

Definition at line 43 of file JPolyline3D.hh.

43  {
44  return static_cast<const JPolyline3D&>(*this);
45  }
JGEOMETRY3D::JPolyline3D
Data structure for polyline in three dimensions.
Definition: JPolyline3D.hh:25
JPolyline3D& JGEOMETRY3D::JPolyline3D::getPolyline ( )
inlineinherited

Get polyline.

Returns
polyline

Definition at line 52 of file JPolyline3D.hh.

53  {
54  return static_cast<JPolyline3D&>(*this);
55  }
JGEOMETRY3D::JPolyline3D
Data structure for polyline in three dimensions.
Definition: JPolyline3D.hh:25
JPolyline3D& JGEOMETRY3D::JPolyline3D::transform ( const JMatrix3D &  T)
inlineinherited

Transform all vertices.

Parameters
Tmatrix

Definition at line 62 of file JPolyline3D.hh.

62  {
63  for( iterator it=begin(); it!=end() ; ++it ) it->transform(T) ;
64  return *this;
65  }
T
do set_variable OUTPUT_DIRECTORY $WORKDIR T
Definition: JCalibrateHeight.sh:61
void JGEOMETRY3D::JPolyline3D::transform ( const JRotation3D &  R,
const JVector3D &  pos 
)
inlineinherited

Transform all vertices of the polyline with a rotation and offset.

See the corresponding function in JPosition3D for more information

Parameters
Rrotation matrix
posposition of origin (after rotation)

Definition at line 157 of file JPolyline3D.hh.

157  {
158  for( iterator it=begin(); it!=end() ; ++it ) it->transform(R,pos) ;
159  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate ( const JRotation3D &  R)
inlineinherited

Rotate all vertices.

Parameters
Rrotation matrix

Definition at line 72 of file JPolyline3D.hh.

73  {
74  for( iterator it=begin(); it!=end() ; ++it ) it->rotate(R);
75  return *this;
76  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate ( const JRotation3X &  R)
inlineinherited

Rotate all vertices around X-axis.

Parameters
Rrotation matrix

Definition at line 93 of file JPolyline3D.hh.

93  {
94  for( iterator it=begin(); it!=end() ; ++it ) it->rotate(R);
95  return *this;
96  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate ( const JRotation3Y &  R)
inlineinherited

Rotate all vertices around Y-axis.

Parameters
Rrotation matrix

Definition at line 114 of file JPolyline3D.hh.

114  {
115  for( iterator it=begin(); it!=end() ; ++it ) it->rotate(R);
116  return *this;
117  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate ( const JRotation3Z &  R)
inlineinherited

Rotate all vertices around Z-axis.

Parameters
Rrotation matrix

Definition at line 135 of file JPolyline3D.hh.

135  {
136  for( iterator it=begin(); it!=end() ; ++it ) it->rotate(R);
137  return *this;
138  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate_back ( const JRotation3D &  R)
inlineinherited

Rotate back all vertices.

Parameters
Rrotation matrix

Definition at line 83 of file JPolyline3D.hh.

83  {
84  for( iterator it=begin(); it!=end() ; ++it ) it->rotate_back(R) ;
85  return *this;
86  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate_back ( const JRotation3X &  R)
inlineinherited

Rotate all vertices back around X-axis.

Parameters
Rrotation matrix

Definition at line 103 of file JPolyline3D.hh.

103  {
104  for( iterator it=begin(); it!=end() ; ++it ) it->rotate_back(R) ;
105  return *this;
106  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate_back ( const JRotation3Y &  R)
inlineinherited

Rotate all vertices back around Y-axis.

Parameters
Rrotation matrix

Definition at line 125 of file JPolyline3D.hh.

125  {
126  for( iterator it=begin(); it!=end() ; ++it ) it->rotate_back(R) ;
127  return *this;
128  }
JPolyline3D& JGEOMETRY3D::JPolyline3D::rotate_back ( const JRotation3Z &  R)
inlineinherited

Rotate all vertices back around Z-axis.

Parameters
Rrotation matrix

Definition at line 145 of file JPolyline3D.hh.

145  {
146  for( iterator it=begin(); it!=end() ; ++it ) it->rotate_back(R) ;
147  return *this;
148  }
void JGEOMETRY3D::JPolyline3D::transform_back ( const JRotation3D &  R,
const JVector3D &  pos 
)
inlineinherited

Transform back all vertices of the polyline.

Parameters
Rrotation matrix
pospolyline of origin (before rotation)

Definition at line 167 of file JPolyline3D.hh.

167  {
168  for( iterator it=begin(); it!=end() ; ++it ) it->transform_back(R,pos) ;
169  }

Member Data Documentation

int JMARKOV::JPhotonPath::n

Definition at line 100 of file JPhotonPath.hh.

double JMARKOV::JPhotonPath::weight

Definition at line 101 of file JPhotonPath.hh.

The documentation for this class was generated from the following file:
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