Correct x-position of slats in station 5.

[u/mrichter/AliRoot.git] / MUON / AliMUONSegmentationV04.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
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 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
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 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
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/*
$Log$
Revision 1.5  2000/10/04 18:50:05  morsch
In Init(): (*fDpxD)[fNsec-1]=fDpx;

Revision 1.4  2000/10/03 21:48:07  morsch
Adopt to const declaration of some of the methods in AliSegmentation.

Revision 1.3  2000/06/29 12:34:09  morsch
AliMUONSegmentation class has been made independent of AliMUONChamber. This makes
it usable with any other geometry class. The link to the object to which it belongs is
established via an index. This assumes that there exists a global geometry manager
from which the pointer to the parent object can be obtained (in our case gAlice).

Revision 1.2  2000/06/15 07:58:48  morsch
Code from MUON-dev joined

Revision 1.1.2.1  2000/06/09 21:38:15  morsch
AliMUONSegmentationV04 code  from  AliMUONSegResV04.cxx

*/

/////////////////////////////////////////////////////
//  Segmentation and Response classes version 04   //
/////////////////////////////////////////////////////


#include "AliMUONSegmentationV04.h"
#include "AliMUONChamber.h"
#include "AliMUON.h"
#include "AliRun.h"

#include <TMath.h>

//___________________________________________
ClassImp(AliMUONSegmentationV04)


void AliMUONSegmentationV04::Init(Int_t chamber)
{
    printf("\n Initialise Segmentation V04 \n");
//
//  Fill the arrays fCx (x-contour) and fNpxS (ix-contour) for each sector
//  These arrays help in converting from real to pad co-ordinates and
//  vice versa
//   
//  Segmentation is defined by rectangular modules approximating
//  concentric circles as shown below
//
//  PCB module size in cm
    const Float_t kDxPCB=40, kDyPCB=40;
//  PCB distribution (7 rows with 1+3 segmentation regions)
    const Int_t kpcb[7][4] = {{1, 2, 2, 2}, 
			      {0, 3, 2, 2}, 
			      {0, 2, 2, 2}, 
			      {0, 0, 3, 3}, 
			      {0, 0, 2, 3}, 
			      {0, 0, 0, 4}, 
			      {0, 0, 0, 3}};
    
    
//
//                             3 3 3 | 3 3 3
//                           3 3 3 3 | 3 3 3 3
//                         3 3 3 2 2 | 2 2 3 3 3
//                       3 3 3 2 2 2 | 2 2 2 3 3 3
//                       3 3 2 2 1 1 | 1 1 2 2 3 3      
//                     3 3 2 2 1 1 1 | 1 1 1 2 2 3 3
//                     3 3 2 2 1 1 0 | 0 1 1 2 2 3 3
//                    ------------------------------
//                     3 3 2 2 1 1 0 | 0 1 1 2 2 3 3
//                     3 3 2 2 1 1 1 | 1 1 1 2 2 3 3
//                       3 3 2 2 1 1 | 1 1 2 2 3 3      
//                       3 3 3 2 2 2 | 2 2 2 3 3 3                      
//                         3 3 3 2 2 | 2 2 3 3 3
//                           3 3 3 3 | 3 3 3 3
//                             3 3 3 | 3 3 3
//
// number of pad rows per PCB
//    
    Int_t nPyPCB=Int_t(kDyPCB/fDpy);
//
// maximum number of pad rows    
    fNpy=7*nPyPCB;
//
//  Calculate padsize along x
    (*fDpxD)[fNsec-1]=fDpx;
    if (fNsec > 1) {
	for (Int_t i=fNsec-2; i>=0; i--){
	    (*fDpxD)[i]=(*fDpxD)[fNsec-1]/(*fNDiv)[i];
	}
    }
//
// fill the arrays defining the pad segmentation boundaries
//
//  loop over pcb module rows
    Int_t iy=0;
    for (Int_t irow=0; irow<7; irow++) {
//  
//  loop over pads along the anode wires
	for (Int_t i=0; i<=nPyPCB; i++) {
//  iy counts the padrow
	    iy++;
//  Loop over sectors (isec=0 is the dead space surounding the beam pipe)
	    for (Int_t isec=0; isec<4; isec++) {
		if (isec==0) {
		    fNpxS[0][iy]=kpcb[irow][0]*Int_t(kDxPCB/(*fDpxD)[0]);
		    fCx[0][iy]=kpcb[irow][0]*kDxPCB;
		} else {
		    fNpxS[isec][iy]=fNpxS[isec-1][iy]
			+kpcb[irow][isec]*Int_t(kDxPCB/(*fDpxD)[isec]);

		    fCx[isec][iy]=fCx[isec-1][iy]
		    +kpcb[irow][isec]*kDxPCB;
		}
	    } // sectors
	} // pad raws in module
    } // PCB rows

    AliMUON *pMUON  = (AliMUON *) gAlice->GetModule("MUON");
    fChamber=&(pMUON->Chamber(chamber));
    fZ = fChamber->Z();
}

void AliMUONSegmentationV04::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y) const
{
// Returns test point on the pad plane.
// Used during determination of the segmoid correction of the COG-method
    n=3;
    x[0]=(fCx[1][1]+fCx[0][1])/2/TMath::Sqrt(2.);
    y[0]=x[0];
    x[1]=(fCx[2][1]+fCx[1][1])/2/TMath::Sqrt(2.);
    y[1]=x[1];
    x[2]=(fCx[3][1]+fCx[2][1])/2/TMath::Sqrt(2.);
    y[2]=x[2];
}