[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.                  *
 **************************************************************************/

/*
$Log$
Revision 1.3  1999/09/29 09:24:23  fca
Introduction of the Copyright and cvs 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[10], Int_t Ylist[10])
{
  /*
    *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	$Log$
67357bb9	18	Revision 1.3 1999/09/29 09:24:23 fca
	19	Introduction of the Copyright and cvs Log
	20
4c039060	21	*/
4c039060	22
a897a37a	23	#include "AliMUONSegResV0.h"
	24	#include "TMath.h"
	25	#include "TRandom.h"
	26	#include "TArc.h"
	27	#include "AliMUONchamber.h"
	28	ClassImp(AliMUONsegmentationV0)
	29	void AliMUONsegmentationV0::Init(AliMUONchamber* Chamber)
	30	{
	31	fNpx=(Int_t) (Chamber->ROuter()/fDpx+1);
	32	fNpy=(Int_t) (Chamber->ROuter()/fDpy+1);
	33	fRmin=Chamber->RInner();
	34	fRmax=Chamber->ROuter();
	35	fCorr=0;
	36
	37	}
	38
	39
	40	Float_t AliMUONsegmentationV0::GetAnod(Float_t xhit)
	41	{
	42	Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5;
	43	return fWireD*wire;
	44	}
	45
	46	void AliMUONsegmentationV0::SetPADSIZ(Float_t p1, Float_t p2)
	47	{
	48	fDpx=p1;
	49	fDpy=p2;
	50	}
	51	void AliMUONsegmentationV0::
	52	GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
	53	{
	54	// returns pad coordinates (ix,iy) for given real coordinates (x,y)
	55	//
	56	ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx)-1;
	57	iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
	58	if (iy > fNpy) iy= fNpy;
	59	if (iy < -fNpy) iy=-fNpy;
	60	if (ix > fNpx) ix= fNpx;
	61	if (ix < -fNpx) ix=-fNpx;
	62	}
	63	void AliMUONsegmentationV0::
	64	GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
	65	{
	66	// returns real coordinates (x,y) for given pad coordinates (ix,iy)
	67	//
	68	x = (ix>0) ? Float_t(ixfDpx)-fDpx/2. : Float_t(ixfDpx)+fDpx/2.;
	69	y = (iy>0) ? Float_t(iyfDpy)-fDpy/2. : Float_t(iyfDpy)+fDpy/2.;
	70	}
	71
	72	void AliMUONsegmentationV0::
	73	SetHit(Float_t xhit, Float_t yhit)
	74	{
	75	//
	76	// Find the wire position (center of charge distribution)
	77	// Float_t x0a=GetAnod(xhit);
	78	fxhit=xhit;
	79	fyhit=yhit;
	80	}
	81
	82	void AliMUONsegmentationV0::
	83	SetPad(Int_t ix, Int_t iy)
	84	{
	85	GetPadCxy(ix,iy,fx,fy);
	86	}
87
88	void AliMUONsegmentationV0::
89	FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
90	{
91	//
92	// Find the wire position (center of charge distribution)
93	Float_t x0a=GetAnod(xhit);
94	fxhit=x0a;
95	fyhit=yhit;
96	//
97	// and take fNsigma*sigma around this center
98	Float_t x01=x0a - dx;
99	Float_t x02=x0a + dx;
100	Float_t y01=yhit - dy;
101	Float_t y02=yhit + dy;
102	//
103	// find the pads over which the charge distributes
104	GetPadIxy(x01,y01,fixmin,fiymin);
105	GetPadIxy(x02,y02,fixmax,fiymax);
106	// printf("\n %f %f %d %d \n",x02,y02,fixmax,fiymax);
107	// printf("\n FirstPad called %f %f \n", fDpx, fDpy);
108	// printf("\n Hit Position %f %f \n",xhit,yhit);
109	// printf("\n Integration limits: %i %i %i %i",fixmin,fixmax,fiymin,fiymax);
110	// printf("\n Integration limits: %f %f %f %f \n",x01,x02,y01,y02);
111	//
112	// Set current pad to lower left corner
113	fix=fixmin;
114	fiy=fiymin;
115	GetPadCxy(fix,fiy,fx,fy);
116	}
117
118	void AliMUONsegmentationV0::NextPad()
119	{
120	//
121	// Step to next pad in integration region
122	if (fix != fixmax) {
123	if (fix==-1) fix++;
124	fix++;
125	} else if (fiy != fiymax) {
126	fix=fixmin;
127	if (fiy==-1) fiy++;
128	fiy++;
129	} else {
130	printf("\n Error: Stepping outside integration region\n ");
131	}
132	GetPadCxy(fix,fiy,fx,fy);
133	}
134
135	Int_t AliMUONsegmentationV0::MorePads()
136	//
137	// Are there more pads in the integration region
138	{
139	if (fix == fixmax && fiy == fiymax) {
140	return 0;
141	} else {
142	return 1;
143
144	}
145	}
146
e3a4d40e	147	void AliMUONsegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t)
a897a37a	148	{
	149	//
	150	// Initialises pad and wire position during stepping
	151	fxt =x;
	152	fyt =y;
	153	GetPadIxy(x,y,fixt,fiyt);
	154	fiwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ;
	155	}
	156
e3a4d40e	157	Int_t AliMUONsegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t)
a897a37a	158	{
	159	//
	160	// Signal will be generated if particle crosses pad boundary or
	161	// boundary between two wires.
	162	Int_t ixt, iyt;
	163	GetPadIxy(x,y,ixt,iyt);
	164	Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1;
	165	if ((ixt != fixt) \|\| (iyt !=fiyt) \|\| (iwt != fiwt)) {
	166	return 1;
	167	} else {
	168	return 0;
	169	}
	170	}
	171	void AliMUONsegmentationV0::
	172	IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
	173	{
	174	// x1=GetAnod(fxt)-fx-fDpx/2.;
	175	x1=fxhit-fx-fDpx/2.;
	176	x2=x1+fDpx;
	177	y1=fyhit-fy-fDpy/2.;
	178	y2=y1+fDpy;
	179	}
	180
	181	void AliMUONsegmentationV0::
67357bb9	182	Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[10], Int_t Ylist[10])
a897a37a	183	{
	184	/*
	185	*Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
	186	Ylist[0]=iY-1;Ylist[1]=iY+1;Ylist[2]=Ylist[3]=iY;
	187	*/
	188	*Nlist=8;
	189	Xlist[0]=Xlist[1]=iX;
	190	Xlist[2]=iX-1;
	191	Xlist[3]=iX+1;
	192	Ylist[0]=iY-1;
	193	Ylist[1]=iY+1;
	194	Ylist[2]=Ylist[3]=iY;
	195
	196	// Diagonal elements
	197	Xlist[4]=iX+1;
	198	Ylist[4]=iY+1;
	199
	200	Xlist[5]=iX-1;
	201	Ylist[5]=iY-1;
	202
	203	Xlist[6]=iX-1;
	204	Ylist[6]=iY+1;
	205
	206	Xlist[7]=iX+1;
	207	Ylist[7]=iY-1;
	208	}
	209
	210	Float_t AliMUONsegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y
e3a4d40e	211	, Int_t *)
a897a37a	212	// Returns the square of the distance between 1 pad
	213	// labelled by its Channel numbers and a coordinate
	214	{
	215	Float_t x,y;
	216	GetPadCxy(iX,iY,x,y);
	217	return (x-X)(x-X) + (y-Y)(y-Y);
	218	}
	219
a897a37a	220	void AliMUONsegmentationV0::GiveTestPoints(Int_t &n, Float_t x, Float_t y)
	221	{
	222	n=1;
	223	x[0]=(fRmax+fRmin)/2/TMath::Sqrt(2.);
	224	y[0]=x[0];
	225	}
	226
e3a4d40e	227	void AliMUONsegmentationV0::Draw(Option_t *)
a897a37a	228	{
	229	TArc *circle;
	230	Float_t scale=0.95/fRmax/2.;
	231
	232
	233	circle = new TArc(0.5,0.5,fRmax*scale,0.,360.);
	234	circle->SetFillColor(2);
	235	circle->Draw();
	236
	237	circle = new TArc(0.5,0.5,fRmin*scale,0.,360.);
	238	circle->SetFillColor(1);
	239	circle->Draw();
	240	}
	241
	242
	243
	244	//___________________________________________
	245	ClassImp(AliMUONresponseV0)
	246	Float_t AliMUONresponseV0::IntPH(Float_t eloss)
	247	{
	248	// Get number of electrons and return charge
	249
	250	Int_t nel;
	251	nel= Int_t(eloss*1.e9/32.);
	252	Float_t charge=0;
	253	if (nel == 0) nel=1;
	254	for (Int_t i=1;i<=nel;i++) {
	255	charge -= fChargeSlope*TMath::Log(gRandom->Rndm());
	256	}
	257	return charge;
	258	}
	259	// -------------------------------------------
	260
	261	Float_t AliMUONresponseV0::IntXY(AliMUONsegmentation * segmentation)
	262	{
	263
	264	const Float_t invpitch = 1/fPitch;
	265	//
	266	// Integration limits defined by segmentation model
	267	//
	268	Float_t xi1, xi2, yi1, yi2;
	269	segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
	270	xi1=xi1*invpitch;
	271	xi2=xi2*invpitch;
	272	yi1=yi1*invpitch;
	273	yi2=yi2*invpitch;
	274	//
	275	// The Mathieson function
	276	Double_t ux1=fSqrtKx3TMath::TanH(fKx2xi1);
	277	Double_t ux2=fSqrtKx3TMath::TanH(fKx2xi2);
	278
	279	Double_t uy1=fSqrtKy3TMath::TanH(fKy2yi1);
	280	Double_t uy2=fSqrtKy3TMath::TanH(fKy2yi2);
	281
	282
	283	return Float_t(4.fKx4(TMath::ATan(ux2)-TMath::ATan(ux1))*
	284	fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
	285	}
	286
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