* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.1 2002/02/14 11:41:28 morsch
-Magnetic field map for ALICE for L3+muon spectrometer stored in 3 seperate
-root files.
-
-*/
+/* $Id$ */
+//-----------------------------------------------------------------------
//
+// Class to handle the field
+// I/O and interpolation
+// of the field map to return the value
+// of the magnetic field in an arbitrary position
// Author: Andreas Morsch <andreas.morsch@cern.ch>
//
+//-----------------------------------------------------------------------
+
+#include <TSystem.h>
-#include <TVector.h>
#include "AliFieldMap.h"
-#include "TSystem.h"
ClassImp(AliFieldMap)
-//________________________________________
-AliFieldMap::AliFieldMap()
+//_______________________________________________________________________
+AliFieldMap::AliFieldMap():
+ fXbeg(0),
+ fYbeg(0),
+ fZbeg(0),
+ fXend(0),
+ fYend(0),
+ fZend(0),
+ fXdel(0),
+ fYdel(0),
+ fZdel(0),
+ fXdeli(0),
+ fYdeli(0),
+ fZdeli(0),
+ fXn(0),
+ fYn(0),
+ fZn(0),
+ fWriteEnable(0),
+ fB(0)
{
//
// Standard constructor
//
- fB = 0;
SetWriteEnable();
}
-AliFieldMap::AliFieldMap(const char *name, const char *title)
- : TNamed(name,title)
+//_______________________________________________________________________
+AliFieldMap::AliFieldMap(const char *name, const char *title):
+ TNamed(name,title),
+ fXbeg(0),
+ fYbeg(0),
+ fZbeg(0),
+ fXend(0),
+ fYend(0),
+ fZend(0),
+ fXdel(0),
+ fYdel(0),
+ fZdel(0),
+ fXdeli(0),
+ fYdeli(0),
+ fZdeli(0),
+ fXn(0),
+ fYn(0),
+ fZn(0),
+ fWriteEnable(0),
+ fB(0)
{
//
// Standard constructor
//
- fB = 0;
ReadField();
SetWriteEnable();
}
+//_______________________________________________________________________
AliFieldMap::~AliFieldMap()
{
-//
-// Destructor
-//
+ //
+ // Destructor
+ //
delete fB;
}
-//________________________________________
-AliFieldMap::AliFieldMap(const AliFieldMap &map)
+//_______________________________________________________________________
+AliFieldMap::AliFieldMap(const AliFieldMap &map):
+ TNamed(map),
+ fXbeg(0),
+ fYbeg(0),
+ fZbeg(0),
+ fXend(0),
+ fYend(0),
+ fZend(0),
+ fXdel(0),
+ fYdel(0),
+ fZdel(0),
+ fXdeli(0),
+ fYdeli(0),
+ fZdeli(0),
+ fXn(0),
+ fYn(0),
+ fZn(0),
+ fWriteEnable(0),
+ fB(0)
{
//
// Copy constructor
map.Copy(*this);
}
-//________________________________________
+//_______________________________________________________________________
void AliFieldMap::ReadField()
{
//
// Method to read the magnetic field map from file
//
FILE* magfile;
-// FILE* endf = fopen("end.table", "r");
-// FILE* out = fopen("out", "w");
+ // FILE* endf = fopen("end.table", "r");
+ // FILE* out = fopen("out", "w");
Int_t ix, iy, iz, ipx, ipy, ipz;
Float_t bx, by, bz;
Int_t nDim = fXn*fYn*fZn;
-// Float_t x,y,z,b;
+ // Float_t x,y,z,b;
fB = new TVector(3*nDim);
if (magfile) {
} // if mafile
}
-void AliFieldMap::Field(Float_t *x, Float_t *b)
+//_______________________________________________________________________
+void AliFieldMap::Field(Float_t *x, Float_t *b) const
{
-//
-// Use simple interpolation to obtain field at point x
-//
+ //
+ // Use simple interpolation to obtain field at point x
+ //
Double_t ratx, raty, ratz, hix, hiy, hiz, ratx1, raty1, ratz1,
bhyhz, bhylz, blyhz, blylz, bhz, blz, xl[3];
const Double_t kone=1;
Int_t ix, iy, iz;
b[0]=b[1]=b[2]=0;
-//
+ //
xl[0]=TMath::Abs(x[0])-fXbeg;
xl[1]=TMath::Abs(x[1])-fYbeg;
raty1=kone-raty;
ratz1=kone-ratz;
+ if (!fB) return;
+
bhyhz = Bx(ix ,iy+1,iz+1)*ratx1+Bx(ix+1,iy+1,iz+1)*ratx;
bhylz = Bx(ix ,iy+1,iz )*ratx1+Bx(ix+1,iy+1,iz )*ratx;
blyhz = Bx(ix ,iy ,iz+1)*ratx1+Bx(ix+1,iy ,iz+1)*ratx;
b[2] = blz *ratz1+bhz *ratz;
}
-//________________________________________
-void AliFieldMap::Copy(AliFieldMap & /* magf */) const
+//_______________________________________________________________________
+void AliFieldMap::Copy(TObject & /* magf */) const
{
//
// Copy *this onto magf -- Not implemented
Fatal("Copy","Not implemented!\n");
}
-//________________________________________
+//_______________________________________________________________________
AliFieldMap & AliFieldMap::operator =(const AliFieldMap &magf)
{
magf.Copy(*this);
return *this;
}
+//_______________________________________________________________________
void AliFieldMap::Streamer(TBuffer &R__b)
{
// Stream an object of class AliFieldMap.
- if (R__b.IsReading()) {
- AliFieldMap::Class()->ReadBuffer(R__b, this);
- } else {
- if (!fWriteEnable) {
- delete fB;
- fB = 0;
- }
- AliFieldMap::Class()->WriteBuffer(R__b, this);
- }
+ TVector* save = 0;
+
+ if (R__b.IsReading()) {
+ AliFieldMap::Class()->ReadBuffer(R__b, this);
+ } else {
+ if (!fWriteEnable) {
+ save = fB;
+ fB = 0;
+ }
+ AliFieldMap::Class()->WriteBuffer(R__b, this);
+ if (!fWriteEnable) fB = save;
+ }
}