Handle missing rec-point tree in a uniform way: return null pointer to TEvePointSet.

[u/mrichter/AliRoot.git] / TRD / AliTRDpoints.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.              *
 *                                                                        *
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 * 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.                  *
 **************************************************************************/

/* $Id$ */

///////////////////////////////////////////////////////////////////////////////
//                                                                           //
//  This class contains the TRD points for the ALICE event display.          //
//  Used to seperately display dEdx and TR photon hits.                      //
//                                                                           //
///////////////////////////////////////////////////////////////////////////////

#include <TPad.h>
#include <TView.h>

#include "AliRun.h"
#include "AliDetector.h"

#include "AliTRDpoints.h"
 
ClassImp(AliTRDpoints)

//_____________________________________________________________________________
AliTRDpoints::AliTRDpoints()
  :AliPoints()
  ,fNTRpoints(0)
  ,fTRpolyMarker(0)
{
  //
  // Default constructor
  //

}

//_____________________________________________________________________________
AliTRDpoints::AliTRDpoints(Int_t nhitsE, Int_t nhitsT)
  :AliPoints(nhitsE)
  ,fNTRpoints(nhitsT)
  ,fTRpolyMarker(0)
{
  //
  // Standard constructor
  //

}
	 
//_____________________________________________________________________________
AliTRDpoints::AliTRDpoints(const AliTRDpoints &p)
  :AliPoints(p)
  ,fNTRpoints(p.fNTRpoints)
  ,fTRpolyMarker(0)
{
  //
  // Copy contructor
  //

  for (Int_t i = 0; i < 3*fNTRpoints; i++) {
    ((AliTRDpoints &) p).fTRpoints[i] = fTRpoints[i];
  }

}

//_____________________________________________________________________________
AliTRDpoints::~AliTRDpoints()
{
  //
  // Default destructor
  //

  if (fTRpolyMarker) {
    delete fTRpolyMarker;
    fTRpolyMarker = 0;
  }

}

//_____________________________________________________________________________
AliTRDpoints &AliTRDpoints::operator=(const AliTRDpoints &p)
{
  //
  // Assignment operator 
  //

  if (this != &p) ((AliTRDpoints &) p).Copy(*this);
  return *this;

}

//_____________________________________________________________________________
void AliTRDpoints::Copy(TObject &p) const
{
  //
  // Copy function
  //

  ((AliTRDpoints &) p).fNTRpoints = fNTRpoints; 
  for (Int_t i = 0; i < 3*fNTRpoints; i++) {
    ((AliTRDpoints &) p).fTRpoints[i] = fTRpoints[i];
  }

}

//_____________________________________________________________________________
void AliTRDpoints::Draw(Option_t *option) 
{
  //
  // Draws a TRD point
  //

  AliPoints::Draw(option);

  if (fNTRpoints) {
    fTRpolyMarker = new TPolyMarker3D(fNTRpoints,fTRpoints,29);
    fTRpolyMarker->SetMarkerColor(2); 
    fTRpolyMarker->SetMarkerSize(0.8);
    fTRpolyMarker->Draw(option);
  }

}

//_____________________________________________________________________________
void AliTRDpoints::SetTRpoints(Int_t n, Float_t *coor) 
{
  //
  // Sets the number and the coordinates of the photon hits
  //

  if (kNTRpoints >= 3*n) {
    fNTRpoints = n;
    for (Int_t i = 0; i < 3*n; i++) {
      fTRpoints[i] = coor[i];
    } 
  }
  else {
    AliError(Form("Boundary error: %d/%d\n",3*n,kNTRpoints));
  }

}