Adding some QCD diffractive states to the PDG list

[u/mrichter/AliRoot.git] / EVGEN / AliGenFixed.cxx

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 * Author: The ALICE Off-line Project.                                    *
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/*
$Log$
Revision 1.7  2001/10/30 11:27:35  morsch
fExplicit member data correctly initialized.

Revision 1.6  2001/07/27 17:09:36  morsch
Use local SetTrack, KeepTrack and SetHighWaterMark methods
to delegate either to local stack or to stack owned by AliRun.
(Piotr Skowronski, A.M.)

Revision 1.5  2001/02/24 11:41:59  morsch
SetGun allows specify completely the particle kinematics and position in one go. (FCA)

Revision 1.4  2000/12/21 16:24:06  morsch
Coding convention clean-up

Revision 1.3  2000/11/30 07:12:50  alibrary
Introducing new Rndm and QA classes

Revision 1.2  2000/10/02 15:17:54  morsch
Unused includes removed.

Revision 1.1  2000/06/09 20:24:00  morsch
Same class as previously in AliSimpleGen.cxx
All coding rule violations except RS3 corrected (AM)

*/



// Simple particle gun. 
// Momentum, phi and theta of the partice as well as the particle type can be set.
// andreas.morsch@cern.ch
//Begin_Html
/*
<img src="picts/AliGeneratorClass.gif">
</pre>
<br clear=left>
<font size=+2 color=red>
<p>The responsible person for this module is
<a href="mailto:andreas.morsch@cern.ch">Andreas Morsch</a>.
</font>
<pre>
*/
//End_Html
//                                                               //
///////////////////////////////////////////////////////////////////

#include "TPDGCode.h"

#include "AliGenFixed.h"
#include "AliRun.h"
  
ClassImp(AliGenFixed)

//_____________________________________________________________________________
AliGenFixed::AliGenFixed()
  :AliGenerator()
{
  //
  // Default constructor
  //
  fIpart = 0;
  fExplicit = kFALSE;
}

//_____________________________________________________________________________
AliGenFixed::AliGenFixed(Int_t npart)
  :AliGenerator(npart)
{
  //
  // Standard constructor
  //
  fName="Fixed";
  fTitle="Fixed Particle Generator";
  // Generate Proton by default
  fIpart=kProton;
  fExplicit = kFALSE;
}

//_____________________________________________________________________________
void AliGenFixed::Generate()
{
  //
  // Generate one trigger
  //
  Float_t polar[3]= {0,0,0};
  if(!fExplicit) {
    fP[0] = fPMin*TMath::Cos(fPhiMin)*TMath::Sin(fThetaMin);
    fP[1] = fPMin*TMath::Sin(fPhiMin)*TMath::Sin(fThetaMin);
    fP[2] = fPMin*TMath::Cos(fThetaMin);
  }
  Int_t i, nt;
  //
  for(i=0;i<fNpart;i++) 
    SetTrack(fTrackIt,-1,fIpart,fP,fOrigin.GetArray(),polar,0,kPPrimary,nt);
}
  
//_____________________________________________________________________________
void AliGenFixed::SetSigma(Float_t sx, Float_t sy, Float_t sz)
{
  //
  // Set the interaction point sigma
  //
  printf("Vertex smearing not implemented for fixed generator\n");
}