// By Bjorn S. Nilsen
////////////////////////////////////////////////////////////////////////
-class AliITSgeomMatrix{
+#include <TObject.h>
+
+class AliITSgeomMatrix : public TObject {
public:
AliITSgeomMatrix(); // Default constructor
+ // Standard constructor #1
AliITSgeomMatrix(const Int_t idt,const Int_t id[3],
const Double_t rot[3],const Double_t tran[3]);
+ // Standard constructor #2
AliITSgeomMatrix(const Int_t idt,const Int_t id[3],
- const Double_t matrix[3][3],const Double_t tran[3]);
- AliITSgeomMatrix(const Double_t rotd[6]/*degrees Geant angles*/,
+ Double_t matrix[3][3],const Double_t tran[3]);
+ // Standard constructor #3
+ AliITSgeomMatrix(const Double_t rotd[6]/*degrees GEANT angles*/,
const Int_t idt,const Int_t id[3],
const Double_t tran[3]);
+ // Copy operator
AliITSgeomMatrix(const AliITSgeomMatrix &source);
+ // Alignment operator
void operator=(const AliITSgeomMatrix &sourse); // copy
- virtual ~AliITSgeomMatrix(){};
- void print(ostream *os);
+ virtual ~AliITSgeomMatrix(){}; // default constructor.
+ // Prints a line describing the output format of the function Print.
+ void PrintComment(ostream *os);
+ // Prints out the content of this class in ASCII format.
+ void Print(ostream *os);
+ // Prints out the content of this class in ASCII format but includes
+ // formating and strings that make it more humanly readable.
void PrintTitles(ostream *os);
- void read(istream *is);
+ // Reads in the content of this class in the format of Print
+ void Read(istream *is);
+ // Given the rotation angles [radians] it fills frot and computes
+ // the rotation matrix fm.
void SetAngles(const Double_t rot[3]){// [radians]
for(Int_t i=0;i<3;i++)frot[i] = rot[i];this->MatrixFromAngle();}
+ // Sets the translation vector and computes fCylR and fCylPhi.
void SetTranslation(const Double_t tran[3]){
- for(Int_t i=0;i<3;i++) ftran[i] = tran[i];}
- void SetMatrix(const Double_t matrix[3][3]){ for(Int_t i=0;i<3;i++)
+ for(Int_t i=0;i<3;i++) ftran[i] = tran[i];
+ fCylR = TMath::Sqrt(ftran[0]*ftran[0]+
+ ftran[1]*ftran[1]);
+ fCylPhi = TMath::ATan2(ftran[1],ftran[0]);
+ if(fCylPhi<0.0) fCylPhi += TMath::Pi();}
+ // sets the rotation matrix and computes the rotation angles [radians]
+ void SetMatrix(Double_t matrix[3][3]){ for(Int_t i=0;i<3;i++)
for(Int_t j=0;j<3;j++) fm[i][j]=matrix[i][j];this->AngleFromMatrix();}
+ // Sets the detector index value
void SetDetectorIndex(const Int_t idt) {fDetectorIndex = idt;}
+ // Sets the detector layer, ladder, detector (id) values.
void SetIndex(const Int_t id[3]){
for(Int_t i=0;i<3;i++) fid[i] = id[i];}
+ // Returns the rotation angles [radians]
void GetAngles(Double_t rot[3]){// [radians]
for(Int_t i=0;i<3;i++) rot[i] = frot[i];}
+ // Returns the translation vector [cm]
void GetTranslation(Double_t tran[3]){
for(Int_t i=0;i<3;i++) tran[i] = ftran[i];}
+ // Returns the translation vector in cylindrical
+ // coordinates [cm,radians]
+ void GetTranslationCylinderical(Double_t tran[3]){
+ tran[0] = fCylR;
+ tran[1] = fCylPhi;
+ tran[2] = ftran[2];}
+ // Returns the values of the rotation matrix
void GetMatrix(Double_t matrix[3][3]){for(Int_t i=0;i<3;i++)
for(Int_t j=0;j<3;j++) matrix[i][j] = fm[i][j];}
- Int_t GetDetectorIndex() {return fDetectorIndex;}
+ // Returns the detector index value.
+ Int_t GetDetectorIndex() const {return fDetectorIndex;}
+ // returns the modules index layer, ladder, detector
void GetIndex(Int_t id[3]){for(Int_t i=0;i<3;i++) id[i] = fid[i];}
+ // Sets the rotation matrix based on the 6 GEANT rotation
+ // angles [radian]
void MatrixFromSixAngles(const Double_t *ang);
+ // Returns the 6 GEANT rotation angles [radians] from the
+ // existing rotation matrix.
void SixAnglesFromMatrix(Double_t *ang);
+ // Given a position in Cartesian ALICE global coordinates [cm]
+ // returns the position in Cartesian detector/module local
+ //coordinates [cm]
void GtoLPosition(const Double_t g[3],Double_t l[3]);
+ // Given a position in Cartesian detector/module local coordinates [cm]
+ // returns the position in Cartesian ALICE global
+ //coordinates [cm]
void LtoGPosition(const Double_t l[3],Double_t g[3]);
+ // Given a momentum in Cartesian ALICE global coordinates
+ // returns the momentum in Cartesian detector/module local
+ //coordinates
void GtoLMomentum(const Double_t g[3],Double_t l[3]);
+ // Given a momentum in Cartesian detector/module local coordinates
+ // returns the momentum in Cartesian ALICE global coordinates
void LtoGMomentum(const Double_t l[3],Double_t g[3]);
- void GtoLPositionError(const Double_t g[3][3],Double_t l[3][3]);
- void LtoGPositionError(const Double_t l[3][3],Double_t g[3][3]);
+ // given a position error matrix in ALICE Cartesian global
+ // coordinates [cm] returns a position error matrix in detector/
+ // module local Cartesian local coordinates [cm]
+ void GtoLPositionError(Double_t g[3][3],Double_t l[3][3]);
+ // given a position error matrix in detector/module Cartesian local
+ // coordinates [cm] returns a position error matrix in ALICE
+ // Cartesian global coordinates [cm]
+ void LtoGPositionError(Double_t l[3][3],Double_t g[3][3]);
// Tracking Related Routines
void GtoLPositionTracking(const Double_t g[3],Double_t l[3]);
+ // Given a position in Cartesian Tracking global coordinates [cm]
+ // returns the position in Cartesian detector/module local
+ // coordinates [cm]
void LtoGPositionTracking(const Double_t l[3],Double_t g[3]);
+ // Given a position in Cartesian detector/module local coordinates [cm]
+ // returns the position in Cartesian Tracking global
+ //coordinates [cm]
void GtoLMomentumTracking(const Double_t g[3],Double_t l[3]);
+ // Given a momentum in Cartesian detector/module local coordinates
+ // returns the momentum in Cartesian Tracking global coordinates
void LtoGMomentumTracking(const Double_t l[3],Double_t g[3]);
- void GtoLPositionErrorTracking(const Double_t g[3][3],
+ // given a position error matrix in Tracking Cartesian global
+ // coordinates [cm] returns a position error matrix in detector/
+ // module local Cartesian local coordinates [cm]
+ void GtoLPositionErrorTracking(Double_t g[3][3],
Double_t l[3][3]);
- void LtoGPositionErrorTracking(const Double_t l[3][3],
+ // given a position error matrix in detector/module Cartesian local
+ // coordinates [cm] returns a position error matrix in Tracking
+ // Cartesian global coordinates [cm]
+ void LtoGPositionErrorTracking(Double_t l[3][3],
Double_t g[3][3]);
+ // Computes the distance squared [cm^2] between a point t[3] and
+ // this module/detector
Double_t Distance2(const Double_t t[3]){Double_t d=0.0,q;
for(Int_t i=0;i<3;i++){q = t[i]-ftran[i]; d += q*q;}
return d;}
private: // private functions
+ // Given the rotation matrix fm it fills the rotation angles frot
void MatrixFromAngle();
+ // Given the rotation angles frot it fills the rotation matrix fm
void AngleFromMatrix();
private: // Data members.
Int_t fDetectorIndex; // Detector type index (like fShapeIndex was)
Int_t fid[3]; // layer, ladder, detector numbers.
- Double_t frot[3]; // vector of rotations about x,y,z [radians].
+ Double_t frot[3]; //! vector of rotations about x,y,z [radians].
Double_t ftran[3]; // Translation vector of module x,y,z.
+ Double_t fCylR,fCylPhi; //! Translation vector in Cylindrical coord.
Double_t fm[3][3]; // Rotation matrix based on frot.
+ // Note, fCylR and fCylPhi are added as data members because it costs
+ // about a factor of 10 to compute them over looking them up. Since
+ // they are used in some tracking algorithms this can be a large cost
+ // in computing time. They are not written out but computed.
+
ClassDef(AliITSgeomMatrix,1) // Matrix class used by AliITSgeom.
};
// Input and output function for standard C++ input/output.
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff