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

#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
a897a37a	1	#include "AliMUONSegResV0.h"
	2	#include "TMath.h"
	3	#include "TRandom.h"
	4	#include "TArc.h"
	5	#include "AliMUONchamber.h"
	6	ClassImp(AliMUONsegmentationV0)
	7	void AliMUONsegmentationV0::Init(AliMUONchamber* Chamber)
	8	{
	9	fNpx=(Int_t) (Chamber->ROuter()/fDpx+1);
	10	fNpy=(Int_t) (Chamber->ROuter()/fDpy+1);
	11	fRmin=Chamber->RInner();
	12	fRmax=Chamber->ROuter();
	13	fCorr=0;
	14
	15	}
	16
	17
	18	Float_t AliMUONsegmentationV0::GetAnod(Float_t xhit)
	19	{
	20	Float_t wire= (xhit>0)? Int_t(xhit/fWireD)+0.5:Int_t(xhit/fWireD)-0.5;
	21	return fWireD*wire;
	22	}
	23
	24	void AliMUONsegmentationV0::SetPADSIZ(Float_t p1, Float_t p2)
	25	{
	26	fDpx=p1;
	27	fDpy=p2;
	28	}
	29	void AliMUONsegmentationV0::
	30	GetPadIxy(Float_t x, Float_t y, Int_t &ix, Int_t &iy)
	31	{
	32	// returns pad coordinates (ix,iy) for given real coordinates (x,y)
	33	//
	34	ix = (x>0)? Int_t(x/fDpx)+1 : Int_t(x/fDpx)-1;
	35	iy = (y>0)? Int_t(y/fDpy)+1 : Int_t(y/fDpy)-1;
	36	if (iy > fNpy) iy= fNpy;
	37	if (iy < -fNpy) iy=-fNpy;
	38	if (ix > fNpx) ix= fNpx;
	39	if (ix < -fNpx) ix=-fNpx;
	40	}
	41	void AliMUONsegmentationV0::
	42	GetPadCxy(Int_t ix, Int_t iy, Float_t &x, Float_t &y)
	43	{
	44	// returns real coordinates (x,y) for given pad coordinates (ix,iy)
	45	//
	46	x = (ix>0) ? Float_t(ixfDpx)-fDpx/2. : Float_t(ixfDpx)+fDpx/2.;
	47	y = (iy>0) ? Float_t(iyfDpy)-fDpy/2. : Float_t(iyfDpy)+fDpy/2.;
	48	}
	49
	50	void AliMUONsegmentationV0::
	51	SetHit(Float_t xhit, Float_t yhit)
	52	{
	53	//
	54	// Find the wire position (center of charge distribution)
	55	// Float_t x0a=GetAnod(xhit);
	56	fxhit=xhit;
	57	fyhit=yhit;
	58	}
	59
	60	void AliMUONsegmentationV0::
	61	SetPad(Int_t ix, Int_t iy)
	62	{
	63	GetPadCxy(ix,iy,fx,fy);
	64	}
65
66	void AliMUONsegmentationV0::
67	FirstPad(Float_t xhit, Float_t yhit, Float_t dx, Float_t dy)
68	{
69	//
70	// Find the wire position (center of charge distribution)
71	Float_t x0a=GetAnod(xhit);
72	fxhit=x0a;
73	fyhit=yhit;
74	//
75	// and take fNsigma*sigma around this center
76	Float_t x01=x0a - dx;
77	Float_t x02=x0a + dx;
78	Float_t y01=yhit - dy;
79	Float_t y02=yhit + dy;
80	//
81	// find the pads over which the charge distributes
82	GetPadIxy(x01,y01,fixmin,fiymin);
83	GetPadIxy(x02,y02,fixmax,fiymax);
84	// printf("\n %f %f %d %d \n",x02,y02,fixmax,fiymax);
85	// printf("\n FirstPad called %f %f \n", fDpx, fDpy);
86	// printf("\n Hit Position %f %f \n",xhit,yhit);
87	// printf("\n Integration limits: %i %i %i %i",fixmin,fixmax,fiymin,fiymax);
88	// printf("\n Integration limits: %f %f %f %f \n",x01,x02,y01,y02);
89	//
90	// Set current pad to lower left corner
91	fix=fixmin;
92	fiy=fiymin;
93	GetPadCxy(fix,fiy,fx,fy);
94	}
95
96	void AliMUONsegmentationV0::NextPad()
97	{
98	//
99	// Step to next pad in integration region
100	if (fix != fixmax) {
101	if (fix==-1) fix++;
102	fix++;
103	} else if (fiy != fiymax) {
104	fix=fixmin;
105	if (fiy==-1) fiy++;
106	fiy++;
107	} else {
108	printf("\n Error: Stepping outside integration region\n ");
109	}
110	GetPadCxy(fix,fiy,fx,fy);
111	}
112
113	Int_t AliMUONsegmentationV0::MorePads()
114	//
115	// Are there more pads in the integration region
116	{
117	if (fix == fixmax && fiy == fiymax) {
118	return 0;
119	} else {
120	return 1;
121
122	}
123	}
124
e3a4d40e	125	void AliMUONsegmentationV0::SigGenInit(Float_t x,Float_t y,Float_t)
a897a37a	126	{
	127	//
	128	// Initialises pad and wire position during stepping
	129	fxt =x;
	130	fyt =y;
	131	GetPadIxy(x,y,fixt,fiyt);
	132	fiwt= (x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1 ;
	133	}
	134
e3a4d40e	135	Int_t AliMUONsegmentationV0::SigGenCond(Float_t x,Float_t y,Float_t)
a897a37a	136	{
	137	//
	138	// Signal will be generated if particle crosses pad boundary or
	139	// boundary between two wires.
	140	Int_t ixt, iyt;
	141	GetPadIxy(x,y,ixt,iyt);
	142	Int_t iwt=(x>0) ? Int_t(x/fWireD)+1 : Int_t(x/fWireD)-1;
	143	if ((ixt != fixt) \|\| (iyt !=fiyt) \|\| (iwt != fiwt)) {
	144	return 1;
	145	} else {
	146	return 0;
	147	}
	148	}
	149	void AliMUONsegmentationV0::
	150	IntegrationLimits(Float_t& x1,Float_t& x2,Float_t& y1, Float_t& y2)
	151	{
	152	// x1=GetAnod(fxt)-fx-fDpx/2.;
	153	x1=fxhit-fx-fDpx/2.;
	154	x2=x1+fDpx;
	155	y1=fyhit-fy-fDpy/2.;
	156	y2=y1+fDpy;
	157	}
	158
	159	void AliMUONsegmentationV0::
	160	Neighbours(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[7], Int_t Ylist[7])
	161	{
	162	/*
	163	*Nlist=4;Xlist[0]=Xlist[1]=iX;Xlist[2]=iX-1;Xlist[3]=iX+1;
	164	Ylist[0]=iY-1;Ylist[1]=iY+1;Ylist[2]=Ylist[3]=iY;
	165	*/
	166	*Nlist=8;
	167	Xlist[0]=Xlist[1]=iX;
	168	Xlist[2]=iX-1;
	169	Xlist[3]=iX+1;
	170	Ylist[0]=iY-1;
	171	Ylist[1]=iY+1;
	172	Ylist[2]=Ylist[3]=iY;
	173
	174	// Diagonal elements
	175	Xlist[4]=iX+1;
	176	Ylist[4]=iY+1;
	177
	178	Xlist[5]=iX-1;
	179	Ylist[5]=iY-1;
	180
	181	Xlist[6]=iX-1;
	182	Ylist[6]=iY+1;
	183
	184	Xlist[7]=iX+1;
	185	Ylist[7]=iY-1;
	186	}
	187
	188	Float_t AliMUONsegmentationV0::Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y
e3a4d40e	189	, Int_t *)
a897a37a	190	// Returns the square of the distance between 1 pad
	191	// labelled by its Channel numbers and a coordinate
	192	{
	193	Float_t x,y;
	194	GetPadCxy(iX,iY,x,y);
	195	return (x-X)(x-X) + (y-Y)(y-Y);
	196	}
	197
a897a37a	198	void AliMUONsegmentationV0::GiveTestPoints(Int_t &n, Float_t x, Float_t y)
	199	{
	200	n=1;
	201	x[0]=(fRmax+fRmin)/2/TMath::Sqrt(2.);
	202	y[0]=x[0];
	203	}
	204
e3a4d40e	205	void AliMUONsegmentationV0::Draw(Option_t *)
a897a37a	206	{
	207	TArc *circle;
	208	Float_t scale=0.95/fRmax/2.;
	209
	210
	211	circle = new TArc(0.5,0.5,fRmax*scale,0.,360.);
	212	circle->SetFillColor(2);
	213	circle->Draw();
	214
	215	circle = new TArc(0.5,0.5,fRmin*scale,0.,360.);
	216	circle->SetFillColor(1);
	217	circle->Draw();
	218	}
	219
	220
	221
	222	//___________________________________________
	223	ClassImp(AliMUONresponseV0)
	224	Float_t AliMUONresponseV0::IntPH(Float_t eloss)
	225	{
	226	// Get number of electrons and return charge
	227
	228	Int_t nel;
	229	nel= Int_t(eloss*1.e9/32.);
	230	Float_t charge=0;
	231	if (nel == 0) nel=1;
	232	for (Int_t i=1;i<=nel;i++) {
	233	charge -= fChargeSlope*TMath::Log(gRandom->Rndm());
	234	}
	235	return charge;
	236	}
	237	// -------------------------------------------
	238
	239	Float_t AliMUONresponseV0::IntXY(AliMUONsegmentation * segmentation)
	240	{
	241
	242	const Float_t invpitch = 1/fPitch;
	243	//
	244	// Integration limits defined by segmentation model
	245	//
	246	Float_t xi1, xi2, yi1, yi2;
	247	segmentation->IntegrationLimits(xi1,xi2,yi1,yi2);
	248	xi1=xi1*invpitch;
	249	xi2=xi2*invpitch;
	250	yi1=yi1*invpitch;
	251	yi2=yi2*invpitch;
	252	//
	253	// The Mathieson function
	254	Double_t ux1=fSqrtKx3TMath::TanH(fKx2xi1);
	255	Double_t ux2=fSqrtKx3TMath::TanH(fKx2xi2);
	256
	257	Double_t uy1=fSqrtKy3TMath::TanH(fKy2yi1);
	258	Double_t uy2=fSqrtKy3TMath::TanH(fKy2yi2);
	259
	260
	261	return Float_t(4.fKx4(TMath::ATan(ux2)-TMath::ATan(ux1))*
	262	fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
	263	}
	264
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