1 #ifndef ALIITSGEOMMATRIX_H
2 #define ALIITSGEOMMATRIX_H
3 /* Copyright(c) 2000, ALICE Experiment at CERN, All rights reserved. *
4 * see cxx source for full Copyright notice. */
6 //////////////////////////////////////////////////////////////////////////
7 // ITS geometry manipulation routines on the module level. This class is
8 // to replace the structure ITS_geom in the class AliITSgeom.
9 // Created May 30 2000.
12 ////////////////////////////////////////////////////////////////////////////
19 class AliITSgeomMatrix : public TObject {
21 AliITSgeomMatrix(); // Default constructor
22 // Standard constructor #1
23 AliITSgeomMatrix(Int_t idt,const Int_t id[3],
24 const Double_t rot[3],const Double_t tran[3]);
25 // Standard constructor #2
26 AliITSgeomMatrix(Int_t idt,const Int_t id[3],
27 Double_t matrix[3][3],const Double_t tran[3]);
28 // Standard constructor #3
29 AliITSgeomMatrix(const Double_t rotd[6]/*degrees GEANT angles*/,
30 Int_t idt,const Int_t id[3],
31 const Double_t tran[3]);
33 AliITSgeomMatrix(const AliITSgeomMatrix &source);
34 // Assignment operator
35 AliITSgeomMatrix& operator=(const AliITSgeomMatrix &source);
36 virtual ~AliITSgeomMatrix(){}; // default constructor.
37 // Prints a line describing the output format of the function Print.
38 void PrintComment(ostream *os) const;
39 // Prints out the content of this class in ASCII format.
40 void Print(ostream *os)const;
41 // Prints out the content of this class in ASCII format but includes
42 // formating and strings that make it more humanly readable.
43 void PrintTitles(ostream *os) const;
44 // Reads in the content of this class in the format of Print
45 void Read(istream *is);
46 virtual void Print(Option_t *option="") const {
47 TObject::Print(option);}
48 virtual Int_t Read(const char *name) {return TObject::Read(name);}
50 // Returns the geometry path corresponding to this transformation
51 TString& GetPath(){return fPath;}
52 // Sets the geometry path
53 void SetPath(const Char_t *p){fPath = p;}
54 void SetPath(const TString &p){fPath = p;}
55 // Given the rotation angles [radians] it fills frot and computes
56 // the rotation matrix fm.
57 void SetAngles(const Double_t rot[3]){// [radians]
58 for(Int_t i=0;i<3;i++)frot[i] = rot[i];this->MatrixFromAngle();}
59 // Sets the translation vector and computes fCylR and fCylPhi.
60 void SetTranslation(const Double_t tran[3]);
61 // sets the rotation matrix and computes the rotation angles [radians]
62 void SetMatrix(const Double_t matrix[3][3]){ for(Int_t i=0;i<3;i++)
63 for(Int_t j=0;j<3;j++) fm[i][j]=matrix[i][j];this->AngleFromMatrix();}
64 // Sets the detector index value
65 void SetDetectorIndex(Int_t idt) {fDetectorIndex = idt;}
66 // Sets the detector layer, ladder, detector (id) values.
67 void SetIndex(const Int_t id[3]){
68 for(Int_t i=0;i<3;i++) fid[i] = id[i];}
69 // Returns the rotation angles [radians]
70 void GetAngles(Double_t rot[3]) const {// [radians]
71 for(Int_t i=0;i<3;i++) rot[i] = frot[i];}
72 // Returns the translation vector [cm]
73 void GetTranslation(Double_t tran[3]) const {
74 for(Int_t i=0;i<3;i++) tran[i] = ftran[i];}
75 // Returns the translation vector in cylindrical
76 // coordinates [cm,radians]
77 void GetTranslationCylinderical (Double_t tran[3]) const {
81 // Returns the values of the rotation matrix
82 void GetMatrix(Double_t matrix[3][3]) const {for(Int_t i=0;i<3;i++)
83 for(Int_t j=0;j<3;j++) matrix[i][j] = fm[i][j];}
84 // Returns the detector index value.
85 Int_t GetDetectorIndex() const {return fDetectorIndex;}
86 // returns the modules index layer, ladder, detector
87 void GetIndex(Int_t id[3]) const {for(Int_t i=0;i<3;i++) id[i] = fid[i];}
88 // Sets the rotation matrix based on the 6 GEANT rotation
90 void MatrixFromSixAngles(const Double_t *ang);
91 // Returns the 6 GEANT rotation angles [radians] from the
92 // existing rotation matrix.
93 void SixAnglesFromMatrix(Double_t *ang)const;
95 // Given a position in Cartesian ALICE global coordinates [cm]
96 // returns the position in Cartesian detector/module local
98 void GtoLPosition(const Double_t g[3],Double_t l[3]) const;
99 // Given a position in Cartesian detector/module local coordinates [cm]
100 // returns the position in Cartesian ALICE global
102 void LtoGPosition(const Double_t l[3],Double_t g[3]) const;
103 // Given a momentum in Cartesian ALICE global coordinates
104 // returns the momentum in Cartesian detector/module local
106 void GtoLMomentum(const Double_t g[3],Double_t l[3]) const;
107 // Given a momentum in Cartesian detector/module local coordinates
108 // returns the momentum in Cartesian ALICE global coordinates
109 void LtoGMomentum(const Double_t l[3],Double_t g[3]) const;
110 // given a position error matrix in ALICE Cartesian global
111 // coordinates [cm] returns a position error matrix in detector/
112 // module local Cartesian local coordinates [cm]
113 void GtoLPositionError(const Double_t g[3][3],Double_t l[3][3]) const;
114 // given a position error matrix in detector/module Cartesian local
115 // coordinates [cm] returns a position error matrix in ALICE
116 // Cartesian global coordinates [cm]
117 void LtoGPositionError(const Double_t l[3][3],Double_t g[3][3]) const;
118 // Tracking Related Routines
119 void GtoLPositionTracking(const Double_t g[3],Double_t l[3]) const;
120 // Given a position in Cartesian Tracking global coordinates [cm]
121 // returns the position in Cartesian detector/module local
123 void LtoGPositionTracking(const Double_t l[3],Double_t g[3]) const;
124 // Given a position in Cartesian detector/module local coordinates [cm]
125 // returns the position in Cartesian Tracking global
127 void GtoLMomentumTracking(const Double_t g[3],Double_t l[3]) const;
128 // Given a momentum in Cartesian detector/module local coordinates
129 // returns the momentum in Cartesian Tracking global coordinates
130 void LtoGMomentumTracking(const Double_t l[3],Double_t g[3]) const;
131 // given a position error matrix in Tracking Cartesian global
132 // coordinates [cm] returns a position error matrix in detector/
133 // module local Cartesian local coordinates [cm]
134 void GtoLPositionErrorTracking(const Double_t g[3][3],
135 Double_t l[3][3]) const;
136 // given a position error matrix in detector/module Cartesian local
137 // coordinates [cm] returns a position error matrix in Tracking
138 // Cartesian global coordinates [cm]
139 void LtoGPositionErrorTracking(const Double_t l[3][3],
140 Double_t g[3][3]) const;
141 // Computes the distance squared [cm^2] between a point t[3] and
142 // this module/detector
143 Double_t Distance2(const Double_t t[3]) const {Double_t d=0.0,q;
144 for(Int_t i=0;i<3;i++){q = t[i]-ftran[i]; d += q*q;}
147 // Documentation related Class
148 TPolyLine3D* CreateLocalAxis() const;
149 TPolyLine3D* CreateLocalAxisTracking() const;
150 TNode* CreateNode(const Char_t *nodeName,const Char_t *nodeTitle,
151 TNode *mother,TShape *shape,Bool_t axis=kTRUE) const;
152 void MakeFigures() const;
154 private: // private functions
155 // Given the rotation matrix fm it fills the rotation angles frot
156 void MatrixFromAngle();
157 // Given the rotation angles frot it fills the rotation matrix fm
158 void AngleFromMatrix();
159 private: // Data members.
160 Int_t fDetectorIndex; // Detector type index (like fShapeIndex was)
161 Int_t fid[3]; // layer, ladder, detector numbers.
162 Double_t frot[3]; //! vector of rotations about x,y,z [radians].
163 Double_t ftran[3]; // Translation vector of module x,y,z.
164 Double_t fCylR,fCylPhi; //! Translation vector in Cylindrical coord.
165 Double_t fm[3][3]; // Rotation matrix based on frot.
166 TString fPath; // Path within Geometry to this volume
168 // Note, fCylR and fCylPhi are added as data members because it costs
169 // about a factor of 10 to compute them over looking them up. Since
170 // they are used in some tracking algorithms this can be a large cost
171 // in computing time. They are not written out but computed.
173 ClassDef(AliITSgeomMatrix,2) // Matrix class used by AliITSgeom.
175 // Input and output function for standard C++ input/output.
176 ostream &operator<<(ostream &os,AliITSgeomMatrix &source);
177 istream &operator>>(istream &os,AliITSgeomMatrix &source);