[u/mrichter/AliRoot.git] / MUON / AliMUONSegmentationV01.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * 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.                  *
 **************************************************************************/

/*
$Log$
Revision 1.1.2.1  2000/06/09 21:37:30  morsch
AliMUONSegmentationV01 code  from  AliMUONSegResV01.cxx

*/


/////////////////////////////////////////////////////
//  Segmentation and Response classes version 01   //
/////////////////////////////////////////////////////

#include <TBox.h> 
#include <TF1.h> 
#include <TObjArray.h>
#include <iostream.h>

#include "AliMUONSegmentationV01.h"
#include "AliMUON.h"


//___________________________________________
ClassImp(AliMUONSegmentationV01)

AliMUONSegmentationV01::AliMUONSegmentationV01(const AliMUONSegmentationV01& segmentation)
{
// Dummy copy constructor
}
AliMUONSegmentationV01::AliMUONSegmentationV01() 
{
// Default constructor
    fNsec=4;
    fRSec.Set(fNsec);    
    fNDiv.Set(fNsec);      
    fDpxD.Set(fNsec);      
    fRSec[0]=fRSec[1]=fRSec[2]=fRSec[3]=0;     
    fNDiv[0]=fNDiv[1]=fNDiv[2]=fNDiv[3]=0;     
    fDpxD[0]=fDpxD[1]=fDpxD[2]=fDpxD[3]=0;     
    fCorr = new TObjArray(3);
    (*fCorr)[0]=0;
    (*fCorr)[1]=0;
    (*fCorr)[2]=0;
} 

Float_t AliMUONSegmentationV01::Dpx(Int_t isec)
{
//
// Returns x-pad size for given sector isec
   return fDpxD[isec];
}

Float_t AliMUONSegmentationV01::Dpy(Int_t isec)
{
//
// Returns y-pad size for given sector isec
   return fDpy;
}
    
void   AliMUONSegmentationV01::SetSegRadii(Float_t  r[4])
{
//
// Set the radii of the segmentation zones 
    for (Int_t i=0; i<4; i++) {
	fRSec[i]=r[i];
	printf("\n R %d %f \n",i,fRSec[i]);
	
    }
}


void AliMUONSegmentationV01::SetPadDivision(Int_t ndiv[4])
{
//
// Defines the pad size perp. to the anode wire (y) for different sectors. 
// Pad sizes are defined as integral fractions ndiv of a basis pad size
// fDpx
// 
    for (Int_t i=0; i<4; i++) {
	fNDiv[i]=ndiv[i];
	printf("\n Ndiv %d %d \n",i,fNDiv[i]);
    }
    ndiv[0]=ndiv[1];
}


void AliMUONSegmentationV01::Init(AliMUONChamber* Chamber)
{
//
//  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.
//  This version approximates concentric segmentation zones
//
    Int_t isec;
    printf("\n Initialise segmentation v01 -- test !!!!!!!!!!!!!! \n");
    fNpy=Int_t(fRSec[fNsec-1]/fDpy)+1;

    fDpxD[fNsec-1]=fDpx;
    if (fNsec > 1) {
	for (Int_t i=fNsec-2; i>=0; i--){
	    fDpxD[i]=fDpxD[fNsec-1]/fNDiv[i];
	    printf("\n test ---dx %d %f \n",i,fDpxD[i]);
	}
    }
//
// fill the arrays defining the pad segmentation boundaries
    Float_t ry;
    Int_t   dnx;
    Int_t   add;
//
//  loop over sections
    for(isec=0; isec<fNsec; isec++) {
//  
//  loop over pads along the aode wires
	for (Int_t iy=1; iy<=fNpy; iy++) {
//
	    Float_t x=iy*fDpy-fDpy/2;
	    if (x > fRSec[isec]) {
		fNpxS[isec][iy]=0;
		fCx[isec][iy]=0;
	    } else {
		ry=TMath::Sqrt(fRSec[isec]*fRSec[isec]-x*x);
		if (isec > 1) {
		    dnx= Int_t((ry-fCx[isec-1][iy])/fDpxD[isec]);
		    if (isec < fNsec-1) {
			if (TMath::Odd((Long_t)dnx)) dnx++;    		
		    }
                    fNpxS[isec][iy]=fNpxS[isec-1][iy]+dnx;
          	    fCx[isec][iy]=fCx[isec-1][iy]+dnx*fDpxD[isec];
		} else if (isec == 1) {
		    dnx= Int_t((ry-fCx[isec-1][iy])/fDpxD[isec]);
		    fNpxS[isec][iy]=fNpxS[isec-1][iy]+dnx;
                    add=4 - (fNpxS[isec][iy])%4;
                    if (add < 4) fNpxS[isec][iy]+=add; 
		    dnx=fNpxS[isec][iy]-fNpxS[isec-1][iy];
		    fCx[isec][iy]=fCx[isec-1][iy]+dnx*fDpxD[isec];
		} else {
		    dnx=Int_t(ry/fDpxD[isec]);
                    fNpxS[isec][iy]=dnx;
		    fCx[isec][iy]=dnx*fDpxD[isec];
		}
	    }
	} // y-pad loop
    } // sector loop
}

Int_t AliMUONSegmentationV01::Sector(Int_t ix, Int_t iy)
{
// Returns sector number for given pad position
//
    Int_t absix=TMath::Abs(ix);
    Int_t absiy=TMath::Abs(iy);
    Int_t isec=0;
    for (Int_t i=0; i<fNsec; i++) {
	if (absix<=fNpxS[i][absiy]){
	    isec=i;
	    break;
	}
    }
    return isec;
}

void AliMUONSegmentationV01::
GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
{
//  Returns pad coordinates (ix,iy) for given real coordinates (x,y)
//
    iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
    if (iy >  fNpy) iy= fNpy;
    if (iy < -fNpy) iy=-fNpy;
//
//  Find sector isec
    Int_t isec=-1;
    Float_t absx=TMath::Abs(x);
    Int_t absiy=TMath::Abs(iy);
    for (Int_t i=0; i < fNsec; i++) {
	if (absx <= fCx[i][absiy]) {
	    isec=i;
	    break;
	}
    }
    if (isec>0) {
	ix= Int_t((absx-fCx[isec-1][absiy])/fDpxD[isec])
	    +fNpxS[isec-1][absiy]+1;
    } else if (isec == 0) {
	ix= Int_t(absx/fDpxD[isec])+1;
    } else {
	ix=fNpxS[fNsec-1][absiy]+1;	
    }
    ix = (x>0) ? ix:-ix;
}

void AliMUONSegmentationV01::
GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
{
//  Returns real coordinates (x,y) for given pad coordinates (ix,iy)
//
    y = (iy>0) ? Float_t(iy*fDpy)-fDpy/2. : Float_t(iy*fDpy)+fDpy/2.;
//
//  Find sector isec
    Int_t isec=AliMUONSegmentationV01::Sector(ix,iy);
//
    Int_t absix=TMath::Abs(ix);
    Int_t absiy=TMath::Abs(iy);
    if (isec) {
	x=fCx[isec-1][absiy]+(absix-fNpxS[isec-1][absiy])*fDpxD[isec];
	x=(ix>0) ?  x-fDpxD[isec]/2 : -x+fDpxD[isec]/2;
    } else {
	x=y=0;
    }
}

void AliMUONSegmentationV01::
SetPad(Int_t ix, Int_t iy)
{
    //
    // Sets virtual pad coordinates, needed for evaluating pad response 
    // outside the tracking program 
    GetPadCxy(ix,iy,fx,fy);
    fSector=Sector(ix,iy);
}


void AliMUONSegmentationV01::
FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
{
// Initialises iteration over pads for charge distribution algorithm
//
    //
    // Find the wire position (center of charge distribution)
    Float_t x0a=GetAnod(xhit);
    fxhit=x0a;
    fyhit=yhit;
    
    //
    // and take fNsigma*sigma around this center
    Float_t x01=x0a  - dx;
    Float_t x02=x0a  + dx;
    Float_t y01=yhit - dy;
    Float_t y02=yhit + dy;
    //
    // find the pads over which the charge distributes
    GetPadIxy(x01,y01,fixmin,fiymin);
    GetPadIxy(x02,y02,fixmax,fiymax);
    fxmin=x01;
    fxmax=x02;
    fymin=y01;
    fymax=y02;
    
    // 
    // Set current pad to lower left corner
    if (fixmax < fixmin) fixmax=fixmin;
    if (fiymax < fiymin) fiymax=fiymin;    
    fix=fixmin;
    fiy=fiymin;
    GetPadCxy(fix,fiy,fx,fy);
}


void AliMUONSegmentationV01::NextPad()
{
// Stepper for the iteration over pads
//
// Step to next pad in the integration region
  // 
  // Step to next pad in integration region
    Float_t xc,yc;
    Int_t   iyc;
    
//  step from left to right    
    if (fx < fxmax && fx != 0) {
	if (fix==-1) fix++;
	fix++;
//  step up 
    } else if (fiy != fiymax) {
	if (fiy==-1) fiy++;
	fiy++;
//      get y-position of next row (yc), xc not used here 	
	GetPadCxy(fix,fiy,xc,yc);
//      get x-pad coordiante for first pad in row (fix)
	GetPadIxy(fxmin,yc,fix,iyc);
    } else {
	printf("\n Error: Stepping outside integration region\n ");
    }
    GetPadCxy(fix,fiy,fx,fy);
    fSector=Sector(fix,fiy);
    if (MorePads() && 
	(fSector ==-1 || fSector==0)) 
	NextPad();
}

Int_t AliMUONSegmentationV01::MorePads()
// Stopping condition for the iterator over pads
//
// Are there more pads in the integration region
{
    if ((fx >= fxmax  && fiy >= fiymax) || fy==0) {
	return 0;
    } else {
	return 1;
    }
}

void AliMUONSegmentationV01::
IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
{
//  Returns integration limits for current pad
//
    x1=fxhit-fx-Dpx(fSector)/2.;
    x2=x1+Dpx(fSector);
    y1=fyhit-fy-Dpy(fSector)/2.;
    y2=y1+Dpy(fSector);    
}

void AliMUONSegmentationV01::
Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[10], Int_t Ylist[10])
{
// Returns list of next neighbours for given Pad (iX, iY)
//
    const Float_t kEpsilon=fDpy/1000;
    
    Float_t x,y;
    Int_t   ixx, iyy, isec1;
//
    Int_t   isec0=AliMUONSegmentationV01::Sector(iX,iY);
    Int_t i=0;
//    
//  step right
    Xlist[i]=iX+1;
    if (Xlist[i]==0) Xlist[i]++;
    Ylist[i++]=iY;
//
//  step left    
    Xlist[i]=iX-1;
    if (Xlist[i]==0) Xlist[i]--;
    Ylist[i++]=iY;
//
//  step up 
    AliMUONSegmentationV01::GetPadCxy(iX,iY,x,y);
    AliMUONSegmentationV01::GetPadIxy(x+kEpsilon,y+fDpy,ixx,iyy);
    Xlist[i]=ixx;
    Ylist[i++]=iyy;
    isec1=AliMUONSegmentationV01::Sector(ixx,iyy);
    if (isec1==isec0) {
//
//  no sector boundary crossing
//	Xlist[i]=ixx+1;
//	Ylist[i++]=iY+1;
	
//	Xlist[i]=ixx-1;
//	Ylist[i++]=iY+1;
    } else if (isec1 < isec0) {
// finer segmentation
//	Xlist[i]=ixx+1;
//	Ylist[i++]=iY+1;
	
	Xlist[i]=ixx-1;
	Ylist[i++]=iyy;
	
//	Xlist[i]=ixx-2;
//	Ylist[i++]=iY+1;
    } else {
// coarser segmenation	
/*
	if (TMath::Odd(iX-fNpxS[isec1-1][iY+1])) {
	    Xlist[i]=ixx-1;
	    Ylist[i++]=iY+1;
	} else {
	    Xlist[i]=ixx+1;
	    Ylist[i++]=iY+1;
	}
*/
    }

//
// step down 
    AliMUONSegmentationV01::GetPadCxy(iX,iY,x,y);
    AliMUONSegmentationV01::GetPadIxy(x+kEpsilon,y-fDpy,ixx,iyy);
    Xlist[i]=ixx;
    Ylist[i++]=iyy;
    isec1=AliMUONSegmentationV01::Sector(ixx,iyy);
    if (isec1==isec0) {
//
//  no sector boundary crossing
/*
    Xlist[i]=ixx+1;
    Ylist[i++]=iY-1;
	
    Xlist[i]=ixx-1;
    Ylist[i++]=iY-1;
*/
    } else if (isec1 < isec0) {
// finer segmentation
//	Xlist[i]=ixx+1;
//	Ylist[i++]=iY-1;
	
	Xlist[i]=ixx-1;
	Ylist[i++]=iyy;
	
//	Xlist[i]=ixx-2;
//	Ylist[i++]=iY-1;
    } else {
// coarser segmentation	
/*
	if (TMath::Odd(iX-fNpxS[isec1-1][iY-1])) {
	    Xlist[i]=ixx-1;
	    Ylist[i++]=iY-1;
	} else {
	    Xlist[i]=ixx+1;
	    Ylist[i++]=iY-1;
	}
*/
    }
    *Nlist=i;
}

void AliMUONSegmentationV01::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y)
{
// Returns test point on the pad plane.
// Used during determination of the segmoid correction of the COG-method

    n=3;
    x[0]=(fRSec[0]+fRSec[1])/2/TMath::Sqrt(2.);
    y[0]=x[0];
    x[1]=(fRSec[1]+fRSec[2])/2/TMath::Sqrt(2.);
    y[1]=x[1];
    x[2]=(fRSec[2]+fRSec[3])/2/TMath::Sqrt(2.);
    y[2]=x[2];
}

void AliMUONSegmentationV01::Draw()
{
// Draws the segmentation zones
//
    TBox *box;
    
    Float_t dx=0.95/fCx[3][1]/2;
    Float_t dy=0.95/(Float_t(Npy()))/2;
    Float_t x0,y0,x1,y1;
    Float_t xc=0.5;
    Float_t yc=0.5;
    
    for (Int_t iy=1; iy<Npy(); iy++)
    {
	for (Int_t isec=0; isec<4; isec++) {
	    if (isec==0) {
		x0=0;
		x1=fCx[isec][iy]*dx;
	    } else {
		x0=fCx[isec-1][iy]*dx;
		x1=fCx[isec][iy]*dx;
	    }
	    y0=Float_t(iy-1)*dy;
	    y1=y0+dy;
	    box=new TBox(x0+xc,y0+yc,x1+xc,y1+yc);
	    box->SetFillColor(isec+1);
	    box->Draw();

	    box=new TBox(-x1+xc,y0+yc,-x0+xc,y1+yc);
	    box->SetFillColor(isec+1);
	    box->Draw();

	    box=new TBox(x0+xc,-y1+yc,x1+xc,-y0+yc);
	    box->SetFillColor(isec+1);
	    box->Draw();

	    box=new TBox(-x1+xc,-y1+yc,-x0+xc,-y0+yc);
	    box->SetFillColor(isec+1);
	    box->Draw();
	}
    }
}
void AliMUONSegmentationV01::SetCorrFunc(Int_t isec, TF1* func)
{
    (*fCorr)[isec]=func;
}

TF1* AliMUONSegmentationV01::CorrFunc(Int_t isec)
{ 
    return (TF1*) (*fCorr)[isec];
}

AliMUONSegmentationV01& AliMUONSegmentationV01::operator 
=(const AliMUONSegmentationV01 & rhs)
{
// Dummy assignment operator
    return *this;
}
Commit	Line	Data
a9e2aefa	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/*
	17	$Log$
	18	Revision 1.1.2.1 2000/06/09 21:37:30 morsch
	19	AliMUONSegmentationV01 code from AliMUONSegResV01.cxx
	20
	21	*/
	22
	23
	24	/////////////////////////////////////////////////////
	25	// Segmentation and Response classes version 01 //
	26	/////////////////////////////////////////////////////
	27
	28	#include <TBox.h>
	29	#include <TF1.h>
	30	#include <TObjArray.h>
	31	#include <iostream.h>
	32
	33	#include "AliMUONSegmentationV01.h"
	34	#include "AliMUON.h"
	35
	36
	37
	38	//___________________________________________
	39	ClassImp(AliMUONSegmentationV01)
	40
	41	AliMUONSegmentationV01::AliMUONSegmentationV01(const AliMUONSegmentationV01& segmentation)
	42	{
	43	// Dummy copy constructor
	44	}
	45	AliMUONSegmentationV01::AliMUONSegmentationV01()
	46	{
	47	// Default constructor
	48	fNsec=4;
	49	fRSec.Set(fNsec);
	50	fNDiv.Set(fNsec);
	51	fDpxD.Set(fNsec);
	52	fRSec[0]=fRSec[1]=fRSec[2]=fRSec[3]=0;
	53	fNDiv[0]=fNDiv[1]=fNDiv[2]=fNDiv[3]=0;
	54	fDpxD[0]=fDpxD[1]=fDpxD[2]=fDpxD[3]=0;
	55	fCorr = new TObjArray(3);
	56	(*fCorr)[0]=0;
	57	(*fCorr)[1]=0;
	58	(*fCorr)[2]=0;
	59	}
	60
	61	Float_t AliMUONSegmentationV01::Dpx(Int_t isec)
	62	{
	63	//
	64	// Returns x-pad size for given sector isec
65	return fDpxD[isec];
66	}
67
68	Float_t AliMUONSegmentationV01::Dpy(Int_t isec)
69	{
70	//
71	// Returns y-pad size for given sector isec
72	return fDpy;
73	}
74
75	void AliMUONSegmentationV01::SetSegRadii(Float_t r[4])
76	{
77	//
78	// Set the radii of the segmentation zones
79	for (Int_t i=0; i<4; i++) {
80	fRSec[i]=r[i];
81	printf("\n R %d %f \n",i,fRSec[i]);
82
83	}
84	}
85
86
87	void AliMUONSegmentationV01::SetPadDivision(Int_t ndiv[4])
88	{
89	//
90	// Defines the pad size perp. to the anode wire (y) for different sectors.
91	// Pad sizes are defined as integral fractions ndiv of a basis pad size
92	// fDpx
93	//
94	for (Int_t i=0; i<4; i++) {
95	fNDiv[i]=ndiv[i];
96	printf("\n Ndiv %d %d \n",i,fNDiv[i]);
97	}
98	ndiv[0]=ndiv[1];
99	}
100
101
102	void AliMUONSegmentationV01::Init(AliMUONChamber* Chamber)
103	{
104	//
105	// Fill the arrays fCx (x-contour) and fNpxS (ix-contour) for each sector
106	// These arrays help in converting from real to pad co-ordinates and
107	// vice versa.
108	// This version approximates concentric segmentation zones
109	//
110	Int_t isec;
111	printf("\n Initialise segmentation v01 -- test !!!!!!!!!!!!!! \n");
112	fNpy=Int_t(fRSec[fNsec-1]/fDpy)+1;
113
114	fDpxD[fNsec-1]=fDpx;
115	if (fNsec > 1) {
116	for (Int_t i=fNsec-2; i>=0; i--){
117	fDpxD[i]=fDpxD[fNsec-1]/fNDiv[i];
118	printf("\n test ---dx %d %f \n",i,fDpxD[i]);
119	}
120	}
121	//
122	// fill the arrays defining the pad segmentation boundaries
123	Float_t ry;
124	Int_t dnx;
125	Int_t add;
126	//
127	// loop over sections
128	for(isec=0; isec<fNsec; isec++) {
129	//
130	// loop over pads along the aode wires
131	for (Int_t iy=1; iy<=fNpy; iy++) {
132	//
133	Float_t x=iy*fDpy-fDpy/2;
134	if (x > fRSec[isec]) {
135	fNpxS[isec][iy]=0;
136	fCx[isec][iy]=0;
137	} else {
138	ry=TMath::Sqrt(fRSec[isec]fRSec[isec]-xx);
139	if (isec > 1) {
140	dnx= Int_t((ry-fCx[isec-1][iy])/fDpxD[isec]);
141	if (isec < fNsec-1) {
142	if (TMath::Odd((Long_t)dnx)) dnx++;
143	}
144	fNpxS[isec][iy]=fNpxS[isec-1][iy]+dnx;
145	fCx[isec][iy]=fCx[isec-1][iy]+dnx*fDpxD[isec];
146	} else if (isec == 1) {
147	dnx= Int_t((ry-fCx[isec-1][iy])/fDpxD[isec]);
148	fNpxS[isec][iy]=fNpxS[isec-1][iy]+dnx;
149	add=4 - (fNpxS[isec][iy])%4;
150	if (add < 4) fNpxS[isec][iy]+=add;
151	dnx=fNpxS[isec][iy]-fNpxS[isec-1][iy];
152	fCx[isec][iy]=fCx[isec-1][iy]+dnx*fDpxD[isec];
153	} else {
154	dnx=Int_t(ry/fDpxD[isec]);
155	fNpxS[isec][iy]=dnx;
156	fCx[isec][iy]=dnx*fDpxD[isec];
157	}
158	}
159	} // y-pad loop
160	} // sector loop
161	}
162
163	Int_t AliMUONSegmentationV01::Sector(Int_t ix, Int_t iy)
164	{
165	// Returns sector number for given pad position
166	//
167	Int_t absix=TMath::Abs(ix);
168	Int_t absiy=TMath::Abs(iy);
169	Int_t isec=0;
170	for (Int_t i=0; i<fNsec; i++) {
171	if (absix<=fNpxS[i][absiy]){
172	isec=i;
173	break;
174	}
175	}
176	return isec;
177	}
178
179	void AliMUONSegmentationV01::
180	GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
181	{
182	// Returns pad coordinates (ix,iy) for given real coordinates (x,y)
183	//
184	iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
185	if (iy > fNpy) iy= fNpy;
186	if (iy < -fNpy) iy=-fNpy;
187	//
188	// Find sector isec
189	Int_t isec=-1;
190	Float_t absx=TMath::Abs(x);
191	Int_t absiy=TMath::Abs(iy);
192	for (Int_t i=0; i < fNsec; i++) {
193	if (absx <= fCx[i][absiy]) {
194	isec=i;
195	break;
196	}
197	}
198	if (isec>0) {
199	ix= Int_t((absx-fCx[isec-1][absiy])/fDpxD[isec])
200	+fNpxS[isec-1][absiy]+1;
201	} else if (isec == 0) {
202	ix= Int_t(absx/fDpxD[isec])+1;
203	} else {
204	ix=fNpxS[fNsec-1][absiy]+1;
205	}
206	ix = (x>0) ? ix:-ix;
207	}
208
209	void AliMUONSegmentationV01::
210	GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
211	{
212	// Returns real coordinates (x,y) for given pad coordinates (ix,iy)
213	//
214	y = (iy>0) ? Float_t(iyfDpy)-fDpy/2. : Float_t(iyfDpy)+fDpy/2.;
215	//
216	// Find sector isec
217	Int_t isec=AliMUONSegmentationV01::Sector(ix,iy);
218	//
219	Int_t absix=TMath::Abs(ix);
220	Int_t absiy=TMath::Abs(iy);
221	if (isec) {
222	x=fCx[isec-1][absiy]+(absix-fNpxS[isec-1][absiy])*fDpxD[isec];
223	x=(ix>0) ? x-fDpxD[isec]/2 : -x+fDpxD[isec]/2;
224	} else {
225	x=y=0;
226	}
227	}
228
229	void AliMUONSegmentationV01::
230	SetPad(Int_t ix, Int_t iy)
231	{
232	//
233	// Sets virtual pad coordinates, needed for evaluating pad response
234	// outside the tracking program
235	GetPadCxy(ix,iy,fx,fy);
236	fSector=Sector(ix,iy);
237	}
238
239
240	void AliMUONSegmentationV01::
241	FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
242	{
243	// Initialises iteration over pads for charge distribution algorithm
244	//
245	//
246	// Find the wire position (center of charge distribution)
247	Float_t x0a=GetAnod(xhit);
248	fxhit=x0a;
249	fyhit=yhit;
250
251	//
252	// and take fNsigma*sigma around this center
253	Float_t x01=x0a - dx;
254	Float_t x02=x0a + dx;
255	Float_t y01=yhit - dy;
256	Float_t y02=yhit + dy;
257	//
258	// find the pads over which the charge distributes
259	GetPadIxy(x01,y01,fixmin,fiymin);
260	GetPadIxy(x02,y02,fixmax,fiymax);
261	fxmin=x01;
262	fxmax=x02;
263	fymin=y01;
264	fymax=y02;
265
266	//
267	// Set current pad to lower left corner
268	if (fixmax < fixmin) fixmax=fixmin;
269	if (fiymax < fiymin) fiymax=fiymin;
270	fix=fixmin;
271	fiy=fiymin;
272	GetPadCxy(fix,fiy,fx,fy);
273	}
274
275
276	void AliMUONSegmentationV01::NextPad()
277	{
278	// Stepper for the iteration over pads
279	//
280	// Step to next pad in the integration region
281	//
282	// Step to next pad in integration region
283	Float_t xc,yc;
284	Int_t iyc;
285
286	// step from left to right
287	if (fx < fxmax && fx != 0) {
288	if (fix==-1) fix++;
289	fix++;
290	// step up
291	} else if (fiy != fiymax) {
292	if (fiy==-1) fiy++;
293	fiy++;
294	// get y-position of next row (yc), xc not used here
295	GetPadCxy(fix,fiy,xc,yc);
296	// get x-pad coordiante for first pad in row (fix)
297	GetPadIxy(fxmin,yc,fix,iyc);
298	} else {
299	printf("\n Error: Stepping outside integration region\n ");
300	}
301	GetPadCxy(fix,fiy,fx,fy);
302	fSector=Sector(fix,fiy);
303	if (MorePads() &&
304	(fSector ==-1 \|\| fSector==0))
305	NextPad();
306	}
307
308	Int_t AliMUONSegmentationV01::MorePads()
309	// Stopping condition for the iterator over pads
310	//
311	// Are there more pads in the integration region
312	{
313	if ((fx >= fxmax && fiy >= fiymax) \|\| fy==0) {
314	return 0;
315	} else {
316	return 1;
317	}
318	}
319
320	void AliMUONSegmentationV01::
321	IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
322	{
323	// Returns integration limits for current pad
324	//
325	x1=fxhit-fx-Dpx(fSector)/2.;
326	x2=x1+Dpx(fSector);
327	y1=fyhit-fy-Dpy(fSector)/2.;
328	y2=y1+Dpy(fSector);
329	}
330
331	void AliMUONSegmentationV01::
332	Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[10], Int_t Ylist[10])
333	{
334	// Returns list of next neighbours for given Pad (iX, iY)
335	//
336	const Float_t kEpsilon=fDpy/1000;
337
338	Float_t x,y;
339	Int_t ixx, iyy, isec1;
340	//
341	Int_t isec0=AliMUONSegmentationV01::Sector(iX,iY);
342	Int_t i=0;
343	//
344	// step right
345	Xlist[i]=iX+1;
346	if (Xlist[i]==0) Xlist[i]++;
347	Ylist[i++]=iY;
348	//
349	// step left
350	Xlist[i]=iX-1;
351	if (Xlist[i]==0) Xlist[i]--;
352	Ylist[i++]=iY;
353	//
354	// step up
355	AliMUONSegmentationV01::GetPadCxy(iX,iY,x,y);
356	AliMUONSegmentationV01::GetPadIxy(x+kEpsilon,y+fDpy,ixx,iyy);
357	Xlist[i]=ixx;
358	Ylist[i++]=iyy;
359	isec1=AliMUONSegmentationV01::Sector(ixx,iyy);
360	if (isec1==isec0) {
361	//
362	// no sector boundary crossing
363	// Xlist[i]=ixx+1;
364	// Ylist[i++]=iY+1;
365
366	// Xlist[i]=ixx-1;
367	// Ylist[i++]=iY+1;
368	} else if (isec1 < isec0) {
369	// finer segmentation
370	// Xlist[i]=ixx+1;
371	// Ylist[i++]=iY+1;
372
373	Xlist[i]=ixx-1;
374	Ylist[i++]=iyy;
375
376	// Xlist[i]=ixx-2;
377	// Ylist[i++]=iY+1;
378	} else {
379	// coarser segmenation
380	/*
381	if (TMath::Odd(iX-fNpxS[isec1-1][iY+1])) {
382	Xlist[i]=ixx-1;
383	Ylist[i++]=iY+1;
384	} else {
385	Xlist[i]=ixx+1;
386	Ylist[i++]=iY+1;
387	}
388	*/
389	}
390
391	//
392	// step down
393	AliMUONSegmentationV01::GetPadCxy(iX,iY,x,y);
394	AliMUONSegmentationV01::GetPadIxy(x+kEpsilon,y-fDpy,ixx,iyy);
395	Xlist[i]=ixx;
396	Ylist[i++]=iyy;
397	isec1=AliMUONSegmentationV01::Sector(ixx,iyy);
398	if (isec1==isec0) {
399	//
400	// no sector boundary crossing
401	/*
402	Xlist[i]=ixx+1;
403	Ylist[i++]=iY-1;
404
405	Xlist[i]=ixx-1;
406	Ylist[i++]=iY-1;
407	*/
408	} else if (isec1 < isec0) {
409	// finer segmentation
410	// Xlist[i]=ixx+1;
411	// Ylist[i++]=iY-1;
412
413	Xlist[i]=ixx-1;
414	Ylist[i++]=iyy;
415
416	// Xlist[i]=ixx-2;
417	// Ylist[i++]=iY-1;
418	} else {
419	// coarser segmentation
420	/*
421	if (TMath::Odd(iX-fNpxS[isec1-1][iY-1])) {
422	Xlist[i]=ixx-1;
423	Ylist[i++]=iY-1;
424	} else {
425	Xlist[i]=ixx+1;
426	Ylist[i++]=iY-1;
427	}
428	*/
429	}
430	*Nlist=i;
431	}
432
433	void AliMUONSegmentationV01::GiveTestPoints(Int_t &n, Float_t x, Float_t y)
434	{
435	// Returns test point on the pad plane.
436	// Used during determination of the segmoid correction of the COG-method
437
438	n=3;
439	x[0]=(fRSec[0]+fRSec[1])/2/TMath::Sqrt(2.);
440	y[0]=x[0];
441	x[1]=(fRSec[1]+fRSec[2])/2/TMath::Sqrt(2.);
442	y[1]=x[1];
443	x[2]=(fRSec[2]+fRSec[3])/2/TMath::Sqrt(2.);
444	y[2]=x[2];
445	}
446
447	void AliMUONSegmentationV01::Draw()
448	{
449	// Draws the segmentation zones
450	//
451	TBox *box;
452
453	Float_t dx=0.95/fCx[3][1]/2;
454	Float_t dy=0.95/(Float_t(Npy()))/2;
455	Float_t x0,y0,x1,y1;
456	Float_t xc=0.5;
457	Float_t yc=0.5;
458
459	for (Int_t iy=1; iy<Npy(); iy++)
460	{
461	for (Int_t isec=0; isec<4; isec++) {
462	if (isec==0) {
463	x0=0;
464	x1=fCx[isec][iy]*dx;
465	} else {
466	x0=fCx[isec-1][iy]*dx;
467	x1=fCx[isec][iy]*dx;
468	}
469	y0=Float_t(iy-1)*dy;
470	y1=y0+dy;
471	box=new TBox(x0+xc,y0+yc,x1+xc,y1+yc);
472	box->SetFillColor(isec+1);
473	box->Draw();
474
475	box=new TBox(-x1+xc,y0+yc,-x0+xc,y1+yc);
476	box->SetFillColor(isec+1);
477	box->Draw();
478
479	box=new TBox(x0+xc,-y1+yc,x1+xc,-y0+yc);
480	box->SetFillColor(isec+1);
481	box->Draw();
482
483	box=new TBox(-x1+xc,-y1+yc,-x0+xc,-y0+yc);
484	box->SetFillColor(isec+1);
485	box->Draw();
486	}
487	}
488	}
489	void AliMUONSegmentationV01::SetCorrFunc(Int_t isec, TF1* func)
490	{
491	(*fCorr)[isec]=func;
492	}
493
494	TF1* AliMUONSegmentationV01::CorrFunc(Int_t isec)
495	{
496	return (TF1) (fCorr)[isec];
497	}
498
499	AliMUONSegmentationV01& AliMUONSegmentationV01::operator
500	=(const AliMUONSegmentationV01 & rhs)
501	{
502	// Dummy assignment operator
503	return *this;
504	}