-//Author: Anders Strand Vestbo
-//Author: Uli Frankenfeld
-//Last Modified: 06.03.2001
+//$Id$
-//____________________________________
-// AliL3Track
-//
-// Base track class for L3
-
-//Changes:
+// Author: Anders Vestbo <mailto:vestbo$fi.uib.no>, Uli Frankenfeld <mailto:franken@fi.uib.no>
+//*-- Copyright © ASV
-//14.03.01: Moved fHitNumbers from protected to private.-ASV
-// Set memory to zero in ctor.
-// Moved fNHits 2 private. Protected data members not a good idea after all.
-//19.03.01: Made the method void Set(AliL3Track) virtual.
#include "AliL3RootTypes.h"
#include "AliL3Logging.h"
#include "AliL3Track.h"
#include "AliL3Transform.h"
+#include "AliL3Vertex.h"
#include <math.h>
+//_____________________________________________________________
+// AliL3Track
+//
+// Track base class
+//Begin_Html
+/*
+<img src="track_coordinates.gif">
+*/
+//End_Html
ClassImp(AliL3Track)
Float_t AliL3Track::BFACT = 0.0029980;
-Float_t AliL3Track::bField = 0.2;
Double_t AliL3Track::pi=3.14159265358979323846;
AliL3Track::AliL3Track()
fIsLocal=true;
fRowRange[0]=0;
fRowRange[1]=0;
- memset(fHitNumbers,0,174*sizeof(UInt_t));
+ memset(fHitNumbers,0,176*sizeof(UInt_t));
}
void AliL3Track::Set(AliL3Track *tpt){
SetCharge(tpt->GetCharge());
SetHits(tpt->GetNHits(),(UInt_t *)tpt->GetHitNumbers());
-
}
+Int_t AliL3Track::Compare(const AliL3Track *track) const
+{
+ if(track->GetNHits() < GetNHits()) return 1;
+ if(track->GetNHits() > GetNHits()) return -1;
+ return 0;
+}
AliL3Track::~AliL3Track()
{
-
+ //Nothing to do
}
Double_t AliL3Track::GetP() const
{
- // Returns total momentum.
-
+ // Returns total momentum.
return fabs(GetPt())*sqrt(1. + GetTgl()*GetTgl());
}
{
return 0.5 * log((GetP() + GetPz()) / (GetP() - GetPz()));
}
-
+/*
Double_t AliL3Track::GetEta() const
{
return GetPseudoRapidity();
}
-
+*/
Double_t AliL3Track::GetRapidity() const
{
Double_t m_pi = 0.13957;
return 0.5 * log((m_pi + GetPz()) / (m_pi - GetPz()));
}
-void AliL3Track::Rotate(Int_t slice)
+void AliL3Track::Rotate(Int_t slice,Bool_t tolocal)
{
-
//Rotate track to global parameters
+ //If flag tolocal is set, the track is rotated
+ //to local coordinates.
- AliL3Transform *transform = new AliL3Transform();
Float_t psi[1] = {GetPsi()};
- transform->Local2GlobalAngle(psi,slice);
+ if(!tolocal)
+ AliL3Transform::Local2GlobalAngle(psi,slice);
+ else
+ AliL3Transform::Global2LocalAngle(psi,slice);
SetPsi(psi[0]);
Float_t first[3];
first[0] = GetFirstPointX();
first[1] = GetFirstPointY();
first[2] = GetFirstPointZ();
- transform->Local2Global(first,slice);
+ if(!tolocal)
+ AliL3Transform::Local2Global(first,slice);
+ else
+ AliL3Transform::Global2Local(first,slice,kTRUE);
+
SetFirstPoint(first[0],first[1],first[2]);
Float_t last[3];
last[0] = GetLastPointX();
last[1] = GetLastPointY();
last[2] = GetLastPointZ();
- transform->Local2Global(last,slice);
+ if(!tolocal)
+ AliL3Transform::Local2Global(last,slice);
+ else
+ AliL3Transform::Global2Local(last,slice,kTRUE);
SetLastPoint(last[0],last[1],last[2]);
-
- fIsLocal=false;
- delete transform;
+
+ Float_t center[3] = {GetCenterX(),GetCenterY(),0};
+ if(!tolocal)
+ AliL3Transform::Local2Global(center,slice);
+ else
+ AliL3Transform::Global2Local(center,slice,kTRUE);
+ SetCenterX(center[0]);
+ SetCenterY(center[1]);
+
+ if(!tolocal)
+ fIsLocal=kFALSE;
+ else
+ fIsLocal=kTRUE;
}
void AliL3Track::CalculateHelix(){
//Calculate Radius, CenterX and Centery from Psi, X0, Y0
//
- fRadius = fPt / (BFACT*bField);
- if(fRadius) fKappa = 1./fRadius;
+ fRadius = fPt / (BFACT*AliL3Transform::GetBField());
+ if(fRadius) fKappa = -fQ*1./fRadius;
else fRadius = 999999; //just zero
Double_t trackPhi0 = fPsi + fQ *0.5 * pi;
fCenterY = fFirstPoint[1] - fRadius * sin(trackPhi0);
}
-Double_t AliL3Track::GetCrossingAngle(Int_t padrow)
+Double_t AliL3Track::GetCrossingAngle(Int_t padrow)
{
//Calculate the crossing angle between track and given padrow.
-
+
if(!IsLocal())
{
printf("Track is not given in local coordinates\n");
return 0;
}
-
+
Float_t xyz[3];
if(!GetCrossingPoint(padrow,xyz))
printf("AliL3HoughTrack::GetCrossingPoint : Track does not cross line!!\n");
}
-Bool_t AliL3Track::GetCrossingPoint(Int_t padrow,Float_t *xyz)
+Bool_t AliL3Track::GetCrossingPoint(Int_t padrow,Float_t *xyz)
{
//Assumes the track is given in local coordinates
- AliL3Transform *transform = new AliL3Transform();
if(!IsLocal())
{
printf("GetCrossingPoint: Track is given on global coordinates\n");
return false;
}
- Double_t xHit = transform->Row2X(padrow);
+ Double_t xHit = AliL3Transform::Row2X(padrow);
xyz[0] = xHit;
Double_t aa = (xHit - GetCenterX())*(xHit - GetCenterX());
Double_t yHit = xyz[1];
Double_t angle1 = atan2((yHit - GetCenterY()),(xHit - GetCenterX()));
- if(angle1 < 0) angle1 += 2.*Pi;
+ if(angle1 < 0) angle1 += 2.*AliL3Transform::Pi();
Double_t angle2 = atan2((GetFirstPointY() - GetCenterY()),(GetFirstPointX() - GetCenterX()));
- if(angle2 < 0) angle2 += 2.*Pi;
+ if(angle2 < 0) angle2 += 2.*AliL3Transform::Pi();
Double_t diff_angle = angle1 - angle2;
- diff_angle = fmod(diff_angle,2*Pi);
- if((GetCharge()*diff_angle) > 0) diff_angle = diff_angle - GetCharge()*2.*Pi;
+ diff_angle = fmod(diff_angle,2*AliL3Transform::Pi());
+ if((GetCharge()*diff_angle) > 0) diff_angle = diff_angle - GetCharge()*2.*AliL3Transform::Pi();
Double_t s_tot = fabs(diff_angle)*GetRadius();
Double_t zHit = GetFirstPointZ() + s_tot*GetTgl();
xyz[2] = zHit;
- delete transform;
return true;
}
-Bool_t AliL3Track::CalculateReferencePoint(Double_t angle){
- // Global coordinate: crossing point with y = ax+ b; a=tan(angle-Pi/2);
+Bool_t AliL3Track::CalculateReferencePoint(Double_t angle,Double_t radius){
+ // Global coordinate: crossing point with y = ax+ b; a=tan(angle-AliL3Transform::Pi()/2);
//
- const Double_t rr=132; //position of referece plane
+ const Double_t rr=radius;//132; //position of referece plane
const Double_t xr = cos(angle) *rr;
const Double_t yr = sin(angle) *rr;
-
+
Double_t a = tan(angle-pi/2);
Double_t b = yr - a * xr;
return IsPoint(kTRUE);
}
+void AliL3Track::GetClosestPoint(AliL3Vertex *vertex,Double_t &closest_x,Double_t &closest_y,Double_t &closest_z)
+{
+ //Calculate the point of closest approach to the vertex
+
+
+ Double_t xc = GetCenterX() - vertex->GetX();//Shift the center of curvature with respect to the vertex
+ Double_t yc = GetCenterY() - vertex->GetY();
+
+ Double_t dist_x1 = xc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
+ Double_t dist_y1 = yc*(1 + GetRadius()/sqrt(xc*xc + yc*yc));
+ Double_t distance1 = sqrt(dist_x1*dist_x1 + dist_y1*dist_y1);
+
+ Double_t dist_x2 = xc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
+ Double_t dist_y2 = yc*(1 - GetRadius()/sqrt(xc*xc + yc*yc));
+ Double_t distance2 = sqrt(dist_x2*dist_x2 + dist_y2*dist_y2);
+
+ //Choose the closest:
+ if(distance1 < distance2)
+ {
+ closest_x = dist_x1 + vertex->GetX();
+ closest_y = dist_y1 + vertex->GetY();
+ }
+ else
+ {
+ closest_x = dist_x2 + vertex->GetX();
+ closest_y = dist_y2 + vertex->GetY();
+ }
+
+ //Get the z coordinate:
+ Double_t angle1 = atan2((closest_y-GetCenterY()),(closest_x-GetCenterX()));
+ if(angle1 < 0) angle1 = angle1 + 2*AliL3Transform::Pi();
+
+ Double_t angle2 = atan2((GetFirstPointY()-GetCenterY()),(GetFirstPointX()-GetCenterX()));
+ if(angle2 < 0) angle2 = angle2 + 2*AliL3Transform::Pi();
+
+ Double_t diff_angle = angle1 - angle2;
+ diff_angle = fmod(diff_angle,2*AliL3Transform::Pi());
+
+ if((GetCharge()*diff_angle) < 0) diff_angle = diff_angle + GetCharge()*2*AliL3Transform::Pi();
+ Double_t s_tot = fabs(diff_angle)*GetRadius();
+
+ closest_z = GetFirstPointZ() - s_tot*GetTgl();
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff