/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/MagneticField/Interpolation/src/MagneticFieldGrid.h

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#ifndef MagneticFieldGrid_H
#define MagneticFieldGrid_H

// interpolation package
#include "FWCore/Utilities/interface/Visibility.h"
#include "VectorFieldInterpolation.h"
#include "binary_ifstream.h"

// used libs
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <fstream>

class dso_internal MagneticFieldGrid{
public:
  // constructor
  MagneticFieldGrid(){
    GridType = 0;
    for (int i=0;i<3; ++i) {NumberOfPoints[i] = 0;};
    for (int i=0;i<3; ++i) {ReferencePoint[i] = 0.;};
    for (int i=0;i<3; ++i) {BasicDistance0[i] = 0.;};
    for (int i=0;i<3; ++i) {for (int j=0;j<3; ++j) {BasicDistance1[i][j] = 0.;};};
    for (int i=0;i<3; ++i) {for (int j=0;j<3; ++j) {BasicDistance2[i][j] = 0.;};};
    for (int i=0;i<4; ++i) {RParAsFunOfPhi[i] = 0.;};
    for (int i=0;i<3; ++i) {EasyCoordinate[i] = false;};
  }
  // destructor
  ~MagneticFieldGrid(){}

private:
  // header classes (5: one for each type)
  class dso_internal HeaderType3{
  public:
    // constructor
    HeaderType3(){}
    // destructor
    ~HeaderType3(){}
  private:
  public:
    void printInfo();
  };
  // b-field container
  class dso_internal BVector{
  public:
    // constructor
    BVector(){}
    // destructor
    ~BVector(){}
  private:
    // three component vector in float precision
    float B3[3];
  public:
    // Accessors
    void putB3(float Bx, float By, float Bz);
    float bx();
    float by();
    float bz();
  };

  // DEFINITION OF GRID
  // type
  int GridType;
  // header
  int    NumberOfPoints[3];
  double ReferencePoint[3];
  double BasicDistance0[3];     // constant step
  double BasicDistance1[3][3];  // linear step
  double BasicDistance2[3][3];  // linear offset
  double RParAsFunOfPhi[4];     // R = f(phi) or const. (0,2: const. par. ; 1,3: const./sin(phi))
  bool   EasyCoordinate[3];
  // field (Bx,By,Bz) container
  std::vector<BVector> FieldValues;

public:
  void load(const std::string& name);
  int gridType();

  void interpolateAtPoint(double X1, double X2, double X3, float &Bx, float &By, float &Bz);

  // calculates indices from coordinates
  void putCoordGetInd(double X1, double X2, double X3, int &Index1, int &Index2, int &Index3);
  // takes indices and returns magnetic field values 
  void putIndicesGetB(int Index1, int Index2, int Index3, float &Bx, float &By, float &Bz);
  // takes indices, calculates coordinates, and returns coordinates
  void putIndGetCoord(int Index1, int Index2, int Index3, double &X1, double &X2, double &X3);
  // converts three indices into one number (for the vector FieldValues)
  int lineNumber(int Index1, int Index2, int Index3);
};


#endif