[u/mrichter/AliRoot.git] / MUON / AliMUONSegResV0.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.                  *
 **************************************************************************/

/*
$Log$
*/

#include "AliMUONSegResV0.h"
#include "TMath.h"
#include "TRandom.h"
#include "TArc.h"
#include "AliMUONchamber.h"
ClassImp(AliMUONsegmentationV0)
    void AliMUONsegmentationV0::Init(AliMUONchamber* Chamber)
{
    fNpx=(Int_t) (Chamber->ROuter()/fDpx+1);
    fNpy=(Int_t) (Chamber->ROuter()/fDpy+1);
    fRmin=Chamber->RInner();
    fRmax=Chamber->ROuter();    
    fCorr=0;
    
}


Float_t AliMUONsegmentationV0::GetAnod(Float_t xhit)
{
    Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5;
    return fWireD*wire;
}

void AliMUONsegmentationV0::SetPADSIZ(Float_t p1, Float_t p2)
{
    fDpx=p1;
    fDpy=p2;
}
void AliMUONsegmentationV0::
    GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
{
//  returns pad coordinates (ix,iy) for given real coordinates (x,y)
//
    ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx)-1;
    iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
    if (iy >  fNpy) iy= fNpy;
    if (iy < -fNpy) iy=-fNpy;
    if (ix >  fNpx) ix= fNpx;
    if (ix < -fNpx) ix=-fNpx;
}
void AliMUONsegmentationV0::
GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
{
//  returns real coordinates (x,y) for given pad coordinates (ix,iy)
//
    x = (ix>0) ? Float_t(ix*fDpx)-fDpx/2. : Float_t(ix*fDpx)+fDpx/2.;
    y = (iy>0) ? Float_t(iy*fDpy)-fDpy/2. : Float_t(iy*fDpy)+fDpy/2.;
}

void AliMUONsegmentationV0::
SetHit(Float_t xhit, Float_t yhit)
{
    //
    // Find the wire position (center of charge distribution)
//    Float_t x0a=GetAnod(xhit);
    fxhit=xhit;
    fyhit=yhit;
}

void AliMUONsegmentationV0::
SetPad(Int_t ix, Int_t iy)
{
    GetPadCxy(ix,iy,fx,fy);
}

void AliMUONsegmentationV0::
FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
{
    //
    // 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);    
//    printf("\n %f %f %d %d \n",x02,y02,fixmax,fiymax);
//    printf("\n FirstPad called %f %f \n", fDpx, fDpy);
//    printf("\n Hit Position %f %f \n",xhit,yhit);
//    printf("\n Integration limits: %i %i %i %i",fixmin,fixmax,fiymin,fiymax);
//    printf("\n Integration limits: %f %f %f %f \n",x01,x02,y01,y02);
    // 
    // Set current pad to lower left corner
    fix=fixmin;
    fiy=fiymin;
    GetPadCxy(fix,fiy,fx,fy);
}

void AliMUONsegmentationV0::NextPad()
{
  // 
  // Step to next pad in integration region
    if (fix != fixmax) {
	if (fix==-1) fix++;
	fix++;
    } else if (fiy != fiymax) {
	fix=fixmin;
	if (fiy==-1) fiy++;
	fiy++;
    } else {
	printf("\n Error: Stepping outside integration region\n ");
    }
    GetPadCxy(fix,fiy,fx,fy);
}

Int_t AliMUONsegmentationV0::MorePads()
//
// Are there more pads in the integration region
{
    if (fix == fixmax && fiy == fiymax) {
	return 0;
    } else {
	return 1;
	
    }
}

void AliMUONsegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t)
{
//
//  Initialises pad and wire position during stepping
    fxt =x;
    fyt =y;
    GetPadIxy(x,y,fixt,fiyt);
    fiwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ;
}

Int_t AliMUONsegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t)
{
//
//  Signal will be generated if particle crosses pad boundary or
//  boundary between two wires. 
    Int_t ixt, iyt;
    GetPadIxy(x,y,ixt,iyt);
    Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1;
    if ((ixt != fixt) || (iyt !=fiyt) || (iwt != fiwt)) {
	return 1;
    } else {
	return 0;
    }
}
void AliMUONsegmentationV0::
IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
{
//    x1=GetAnod(fxt)-fx-fDpx/2.;
    x1=fxhit-fx-fDpx/2.;
    x2=x1+fDpx;
    y1=fyhit-fy-fDpy/2.;
    y2=y1+fDpy;    
}

void AliMUONsegmentationV0::
Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[7], Int_t Ylist[7])
{
  /*
    *Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
    Ylist[0]=iY-1;Ylist[1]=iY+1;Ylist[2]=Ylist[3]=iY;
  */
    *Nlist=8;
    Xlist[0]=Xlist[1]=iX;
    Xlist[2]=iX-1;
    Xlist[3]=iX+1;
    Ylist[0]=iY-1;
    Ylist[1]=iY+1;
    Ylist[2]=Ylist[3]=iY;

   // Diagonal elements
    Xlist[4]=iX+1;
    Ylist[4]=iY+1;

    Xlist[5]=iX-1;
    Ylist[5]=iY-1;

    Xlist[6]=iX-1;
    Ylist[6]=iY+1;

    Xlist[7]=iX+1;
    Ylist[7]=iY-1;
}

Float_t AliMUONsegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y
, Int_t *)
// Returns the square of the distance between 1 pad
// labelled by its Channel numbers and a coordinate
{
  Float_t x,y;
  GetPadCxy(iX,iY,x,y);
  return (x-X)*(x-X) + (y-Y)*(y-Y);
}

void  AliMUONsegmentationV0::GiveTestPoints(Int_t &n, Float_t *x, Float_t *y)
{
    n=1;
    x[0]=(fRmax+fRmin)/2/TMath::Sqrt(2.);
    y[0]=x[0];
}

void AliMUONsegmentationV0::Draw(Option_t *)
{
    TArc *circle;
    Float_t scale=0.95/fRmax/2.;
    

    circle = new TArc(0.5,0.5,fRmax*scale,0.,360.);
    circle->SetFillColor(2);
    circle->Draw();

    circle = new TArc(0.5,0.5,fRmin*scale,0.,360.);
    circle->SetFillColor(1);
    circle->Draw();
}


//___________________________________________
ClassImp(AliMUONresponseV0)	
Float_t AliMUONresponseV0::IntPH(Float_t eloss)
{
  // Get number of electrons and return charge
     
  Int_t nel;
  nel= Int_t(eloss*1.e9/32.);
  Float_t charge=0;
  if (nel == 0) nel=1;
  for (Int_t i=1;i<=nel;i++) {
    charge -= fChargeSlope*TMath::Log(gRandom->Rndm());    
  }
  return charge;
}
// -------------------------------------------

Float_t AliMUONresponseV0::IntXY(AliMUONsegmentation * segmentation)
{

    const Float_t invpitch = 1/fPitch;
//
//  Integration limits defined by segmentation model
//  
    Float_t xi1, xi2, yi1, yi2;
    segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
    xi1=xi1*invpitch;
    xi2=xi2*invpitch;
    yi1=yi1*invpitch;
    yi2=yi2*invpitch;
//
// The Mathieson function 
    Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
    Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);

    Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
    Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);

    
    return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
		      fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
}
Commit	Line	Data
4c039060	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	*/
	19
a897a37a	20	#include "AliMUONSegResV0.h"
	21	#include "TMath.h"
	22	#include "TRandom.h"
	23	#include "TArc.h"
	24	#include "AliMUONchamber.h"
	25	ClassImp(AliMUONsegmentationV0)
	26	void AliMUONsegmentationV0::Init(AliMUONchamber* Chamber)
	27	{
	28	fNpx=(Int_t) (Chamber->ROuter()/fDpx+1);
	29	fNpy=(Int_t) (Chamber->ROuter()/fDpy+1);
	30	fRmin=Chamber->RInner();
	31	fRmax=Chamber->ROuter();
	32	fCorr=0;
	33
	34	}
	35
	36
	37	Float_t AliMUONsegmentationV0::GetAnod(Float_t xhit)
	38	{
	39	Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5;
	40	return fWireD*wire;
	41	}
	42
	43	void AliMUONsegmentationV0::SetPADSIZ(Float_t p1, Float_t p2)
	44	{
	45	fDpx=p1;
	46	fDpy=p2;
	47	}
	48	void AliMUONsegmentationV0::
	49	GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
	50	{
	51	// returns pad coordinates (ix,iy) for given real coordinates (x,y)
	52	//
	53	ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx)-1;
	54	iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
	55	if (iy > fNpy) iy= fNpy;
	56	if (iy < -fNpy) iy=-fNpy;
	57	if (ix > fNpx) ix= fNpx;
	58	if (ix < -fNpx) ix=-fNpx;
	59	}
	60	void AliMUONsegmentationV0::
	61	GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
	62	{
	63	// returns real coordinates (x,y) for given pad coordinates (ix,iy)
	64	//
	65	x = (ix>0) ? Float_t(ixfDpx)-fDpx/2. : Float_t(ixfDpx)+fDpx/2.;
	66	y = (iy>0) ? Float_t(iyfDpy)-fDpy/2. : Float_t(iyfDpy)+fDpy/2.;
	67	}
	68
	69	void AliMUONsegmentationV0::
	70	SetHit(Float_t xhit, Float_t yhit)
	71	{
	72	//
	73	// Find the wire position (center of charge distribution)
	74	// Float_t x0a=GetAnod(xhit);
	75	fxhit=xhit;
	76	fyhit=yhit;
	77	}
	78
	79	void AliMUONsegmentationV0::
	80	SetPad(Int_t ix, Int_t iy)
	81	{
	82	GetPadCxy(ix,iy,fx,fy);
	83	}
84
85	void AliMUONsegmentationV0::
86	FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
87	{
88	//
89	// Find the wire position (center of charge distribution)
90	Float_t x0a=GetAnod(xhit);
91	fxhit=x0a;
92	fyhit=yhit;
93	//
94	// and take fNsigma*sigma around this center
95	Float_t x01=x0a - dx;
96	Float_t x02=x0a + dx;
97	Float_t y01=yhit - dy;
98	Float_t y02=yhit + dy;
99	//
100	// find the pads over which the charge distributes
101	GetPadIxy(x01,y01,fixmin,fiymin);
102	GetPadIxy(x02,y02,fixmax,fiymax);
103	// printf("\n %f %f %d %d \n",x02,y02,fixmax,fiymax);
104	// printf("\n FirstPad called %f %f \n", fDpx, fDpy);
105	// printf("\n Hit Position %f %f \n",xhit,yhit);
106	// printf("\n Integration limits: %i %i %i %i",fixmin,fixmax,fiymin,fiymax);
107	// printf("\n Integration limits: %f %f %f %f \n",x01,x02,y01,y02);
108	//
109	// Set current pad to lower left corner
110	fix=fixmin;
111	fiy=fiymin;
112	GetPadCxy(fix,fiy,fx,fy);
113	}
114
115	void AliMUONsegmentationV0::NextPad()
116	{
117	//
118	// Step to next pad in integration region
119	if (fix != fixmax) {
120	if (fix==-1) fix++;
121	fix++;
122	} else if (fiy != fiymax) {
123	fix=fixmin;
124	if (fiy==-1) fiy++;
125	fiy++;
126	} else {
127	printf("\n Error: Stepping outside integration region\n ");
128	}
129	GetPadCxy(fix,fiy,fx,fy);
130	}
131
132	Int_t AliMUONsegmentationV0::MorePads()
133	//
134	// Are there more pads in the integration region
135	{
136	if (fix == fixmax && fiy == fiymax) {
137	return 0;
138	} else {
139	return 1;
140
141	}
142	}
143
e3a4d40e	144	void AliMUONsegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t)
a897a37a	145	{
	146	//
	147	// Initialises pad and wire position during stepping
	148	fxt =x;
	149	fyt =y;
	150	GetPadIxy(x,y,fixt,fiyt);
	151	fiwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ;
	152	}
	153
e3a4d40e	154	Int_t AliMUONsegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t)
a897a37a	155	{
	156	//
	157	// Signal will be generated if particle crosses pad boundary or
	158	// boundary between two wires.
	159	Int_t ixt, iyt;
	160	GetPadIxy(x,y,ixt,iyt);
	161	Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1;
	162	if ((ixt != fixt) \|\| (iyt !=fiyt) \|\| (iwt != fiwt)) {
	163	return 1;
	164	} else {
	165	return 0;
	166	}
	167	}
	168	void AliMUONsegmentationV0::
	169	IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
	170	{
	171	// x1=GetAnod(fxt)-fx-fDpx/2.;
	172	x1=fxhit-fx-fDpx/2.;
	173	x2=x1+fDpx;
	174	y1=fyhit-fy-fDpy/2.;
	175	y2=y1+fDpy;
	176	}
	177
	178	void AliMUONsegmentationV0::
	179	Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[7], Int_t Ylist[7])
	180	{
	181	/*
	182	*Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
	183	Ylist[0]=iY-1;Ylist[1]=iY+1;Ylist[2]=Ylist[3]=iY;
	184	*/
	185	*Nlist=8;
	186	Xlist[0]=Xlist[1]=iX;
	187	Xlist[2]=iX-1;
	188	Xlist[3]=iX+1;
	189	Ylist[0]=iY-1;
	190	Ylist[1]=iY+1;
	191	Ylist[2]=Ylist[3]=iY;
	192
	193	// Diagonal elements
	194	Xlist[4]=iX+1;
	195	Ylist[4]=iY+1;
	196
	197	Xlist[5]=iX-1;
	198	Ylist[5]=iY-1;
	199
	200	Xlist[6]=iX-1;
	201	Ylist[6]=iY+1;
	202
	203	Xlist[7]=iX+1;
	204	Ylist[7]=iY-1;
	205	}
	206
	207	Float_t AliMUONsegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y
e3a4d40e	208	, Int_t *)
a897a37a	209	// Returns the square of the distance between 1 pad
	210	// labelled by its Channel numbers and a coordinate
	211	{
	212	Float_t x,y;
	213	GetPadCxy(iX,iY,x,y);
	214	return (x-X)(x-X) + (y-Y)(y-Y);
	215	}
	216
a897a37a	217	void AliMUONsegmentationV0::GiveTestPoints(Int_t &n, Float_t x, Float_t y)
	218	{
	219	n=1;
	220	x[0]=(fRmax+fRmin)/2/TMath::Sqrt(2.);
	221	y[0]=x[0];
	222	}
	223
e3a4d40e	224	void AliMUONsegmentationV0::Draw(Option_t *)
a897a37a	225	{
	226	TArc *circle;
	227	Float_t scale=0.95/fRmax/2.;
	228
	229
	230	circle = new TArc(0.5,0.5,fRmax*scale,0.,360.);
	231	circle->SetFillColor(2);
	232	circle->Draw();
	233
	234	circle = new TArc(0.5,0.5,fRmin*scale,0.,360.);
	235	circle->SetFillColor(1);
	236	circle->Draw();
	237	}
	238
	239
	240
	241	//___________________________________________
	242	ClassImp(AliMUONresponseV0)
	243	Float_t AliMUONresponseV0::IntPH(Float_t eloss)
	244	{
	245	// Get number of electrons and return charge
	246
	247	Int_t nel;
	248	nel= Int_t(eloss*1.e9/32.);
	249	Float_t charge=0;
	250	if (nel == 0) nel=1;
	251	for (Int_t i=1;i<=nel;i++) {
	252	charge -= fChargeSlope*TMath::Log(gRandom->Rndm());
	253	}
	254	return charge;
	255	}
	256	// -------------------------------------------
	257
	258	Float_t AliMUONresponseV0::IntXY(AliMUONsegmentation * segmentation)
	259	{
	260
	261	const Float_t invpitch = 1/fPitch;
	262	//
	263	// Integration limits defined by segmentation model
	264	//
	265	Float_t xi1, xi2, yi1, yi2;
	266	segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
	267	xi1=xi1*invpitch;
	268	xi2=xi2*invpitch;
	269	yi1=yi1*invpitch;
	270	yi2=yi2*invpitch;
	271	//
	272	// The Mathieson function
	273	Double_t ux1=fSqrtKx3TMath::TanH(fKx2xi1);
	274	Double_t ux2=fSqrtKx3TMath::TanH(fKx2xi2);
	275
	276	Double_t uy1=fSqrtKy3TMath::TanH(fKy2yi1);
	277	Double_t uy2=fSqrtKy3TMath::TanH(fKy2yi2);
	278
	279
	280	return Float_t(4.fKx4(TMath::ATan(ux2)-TMath::ATan(ux1))*
	281	fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
	282	}
	283
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