CbmFieldMapSym2.cxx

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// -------------------------------------------------------------------------
// -----                  CbmFieldMapSym2 source file               -----
// -----      Created 09/06/05  by E. Litvinenko (CbmFieldMapLIT.cxx)  -----
// -----                Redesign 20/02/06  by V. Friese                -----
// -------------------------------------------------------------------------
#include "CbmFieldMapSym2.h"
 
#include <TArrayF.h>  // for TArrayF
 
// -------------   Default constructor  ----------------------------------
CbmFieldMapSym2::CbmFieldMapSym2() : CbmFieldMap(), fHemiX(0.), fHemiY(0.) {
  fType = 2;
}
// ------------------------------------------------------------------------
 
 
// -------------   Standard constructor   ---------------------------------
CbmFieldMapSym2::CbmFieldMapSym2(const char* mapName, const char* fileType)
  : CbmFieldMap(mapName, fileType), fHemiX(0.), fHemiY(0.) {
  fType = 2;
}
// ------------------------------------------------------------------------
 
 
// ------------   Constructor from CbmFieldPar   --------------------------
CbmFieldMapSym2::CbmFieldMapSym2(CbmFieldPar* fieldPar)
  : CbmFieldMap(fieldPar), fHemiX(0.), fHemiY(0.) {
  fType = 2;
}
// ------------------------------------------------------------------------
 
 
// ------------   Destructor   --------------------------------------------
CbmFieldMapSym2::~CbmFieldMapSym2() {}
// ------------------------------------------------------------------------
 
 
// -----------   Get x component of the field   ---------------------------
Double_t CbmFieldMapSym2::GetBx(Double_t x, Double_t y, Double_t z) {
 
  Int_t ix    = 0;
  Int_t iy    = 0;
  Int_t iz    = 0;
  Double_t dx = 0.;
  Double_t dy = 0.;
  Double_t dz = 0.;
 
  if (IsInside(x, y, z, ix, iy, iz, dx, dy, dz)) {
 
    // Get Bx field values at grid cell corners
    fHa[0][0][0] = fBx->At(ix * fNy * fNz + iy * fNz + iz);
    fHa[1][0][0] = fBx->At((ix + 1) * fNy * fNz + iy * fNz + iz);
    fHa[0][1][0] = fBx->At(ix * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[1][1][0] = fBx->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[0][0][1] = fBx->At(ix * fNy * fNz + iy * fNz + (iz + 1));
    fHa[1][0][1] = fBx->At((ix + 1) * fNy * fNz + iy * fNz + (iz + 1));
    fHa[0][1][1] = fBx->At(ix * fNy * fNz + (iy + 1) * fNz + (iz + 1));
    fHa[1][1][1] = fBx->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + (iz + 1));
 
    // Return interpolated field value
    return Interpolate(dx, dy, dz) * fHemiX * fHemiY;
  }
 
  return 0.;
}
// ------------------------------------------------------------------------
 
 
// -----------   Get y component of the field   ---------------------------
Double_t CbmFieldMapSym2::GetBy(Double_t x, Double_t y, Double_t z) {
 
  Int_t ix    = 0;
  Int_t iy    = 0;
  Int_t iz    = 0;
  Double_t dx = 0.;
  Double_t dy = 0.;
  Double_t dz = 0.;
 
  if (IsInside(x, y, z, ix, iy, iz, dx, dy, dz)) {
 
    // Get By field values at grid cell corners
    fHa[0][0][0] = fBy->At(ix * fNy * fNz + iy * fNz + iz);
    fHa[1][0][0] = fBy->At((ix + 1) * fNy * fNz + iy * fNz + iz);
    fHa[0][1][0] = fBy->At(ix * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[1][1][0] = fBy->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[0][0][1] = fBy->At(ix * fNy * fNz + iy * fNz + (iz + 1));
    fHa[1][0][1] = fBy->At((ix + 1) * fNy * fNz + iy * fNz + (iz + 1));
    fHa[0][1][1] = fBy->At(ix * fNy * fNz + (iy + 1) * fNz + (iz + 1));
    fHa[1][1][1] = fBy->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + (iz + 1));
 
    // Return interpolated field value
    return Interpolate(dx, dy, dz);
  }
 
  return 0.;
}
// ------------------------------------------------------------------------
 
 
// -----------   Get z component of the field   ---------------------------
Double_t CbmFieldMapSym2::GetBz(Double_t x, Double_t y, Double_t z) {
 
  Int_t ix    = 0;
  Int_t iy    = 0;
  Int_t iz    = 0;
  Double_t dx = 0.;
  Double_t dy = 0.;
  Double_t dz = 0.;
 
  if (IsInside(x, y, z, ix, iy, iz, dx, dy, dz)) {
 
    // Get Bz field values at grid cell corners
    fHa[0][0][0] = fBz->At(ix * fNy * fNz + iy * fNz + iz);
    fHa[1][0][0] = fBz->At((ix + 1) * fNy * fNz + iy * fNz + iz);
    fHa[0][1][0] = fBz->At(ix * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[1][1][0] = fBz->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + iz);
    fHa[0][0][1] = fBz->At(ix * fNy * fNz + iy * fNz + (iz + 1));
    fHa[1][0][1] = fBz->At((ix + 1) * fNy * fNz + iy * fNz + (iz + 1));
    fHa[0][1][1] = fBz->At(ix * fNy * fNz + (iy + 1) * fNz + (iz + 1));
    fHa[1][1][1] = fBz->At((ix + 1) * fNy * fNz + (iy + 1) * fNz + (iz + 1));
 
    // Return interpolated field value
    return Interpolate(dx, dy, dz) * fHemiY;
  }
 
  return 0.;
}
// ------------------------------------------------------------------------
 
 
// -----------   Check whether a point is inside the map   ----------------
Bool_t CbmFieldMapSym2::IsInside(Double_t x,
                                 Double_t y,
                                 Double_t z,
                                 Int_t& ix,
                                 Int_t& iy,
                                 Int_t& iz,
                                 Double_t& dx,
                                 Double_t& dy,
                                 Double_t& dz) {
 
  // --- Transform into local coordinate system
  Double_t xl = x - fPosX;
  Double_t yl = y - fPosY;
  Double_t zl = z - fPosZ;
 
  // ---  Reflect w.r.t. symmetry axes
  fHemiX = fHemiY = 1.;
  if (xl < 0.) {
    fHemiX = -1.;
    xl     = -1. * xl;
  }
  if (yl < 0.) {
    fHemiY = -1.;
    yl     = -1. * yl;
  }
 
  // ---  Check for being outside the map range
  if (!(xl >= fXmin && xl < fXmax && yl >= fYmin && yl < fYmax && zl >= fZmin
        && zl < fZmax)) {
    ix = iy = iz = 0;
    dx = dy = dz = 0.;
    return kFALSE;
  }
 
  // --- Determine grid cell
  ix = Int_t((xl - fXmin) / fXstep);
  iy = Int_t((yl - fYmin) / fYstep);
  iz = Int_t((zl - fZmin) / fZstep);
 
 
  // Relative distance from grid point (in units of cell size)
  dx = (xl - fXmin) / fXstep - Double_t(ix);
  dy = (yl - fYmin) / fYstep - Double_t(iy);
  dz = (zl - fZmin) / fZstep - Double_t(iz);
 
  return kTRUE;
}
// ------------------------------------------------------------------------
 
 
ClassImp(CbmFieldMapSym2)