AliMpSectorAreaVPadIterator.cxx

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 * Author: The ALICE Off-line Project.                                    *
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 * documentation strictly for non-commercial purposes is hereby granted   *
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 * appear in the supporting documentation. The authors make no claims     *
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// $Id$
// $MpId: AliMpSectorAreaVPadIterator.cxx,v 1.8 2006/05/24 13:58:46 ivana Exp $
// Category: sector

//-----------------------------------------------------------------------------
// Class AliMpSectorAreaVPadIterator
// ---------------------------------
// Class, which defines an iterator over the pads 
// inside a given area in a sector in vertical direction.
// Included in AliRoot: 2003/05/02
// Authors: David Guez, Ivana Hrivnacova; IPN Orsay
//-----------------------------------------------------------------------------

#include "AliMpSectorAreaVPadIterator.h"
#include "AliMpSectorSegmentation.h"
#include "AliMpConstants.h"

#include "AliLog.h"

#include <Riostream.h>

ClassImp(AliMpSectorAreaVPadIterator)

//______________________________________________________________________________
AliMpSectorAreaVPadIterator::AliMpSectorAreaVPadIterator(
                                const AliMpSectorSegmentation* segmentation,
                                const AliMpArea& area) 
 : AliMpVPadIterator(),
   fkSegmentation(segmentation),
   fkArea(area),
   fCurrentPad(AliMpPad::Invalid()),
   fCurrentColumnPosition(0.)
{
}

//______________________________________________________________________________
AliMpSectorAreaVPadIterator::AliMpSectorAreaVPadIterator(
                                const AliMpSectorAreaVPadIterator& right)
  : AliMpVPadIterator(right),
    fkSegmentation(0),
    fkArea(AliMpArea()),
    fCurrentPad(AliMpPad::Invalid()),
    fCurrentColumnPosition(0.)
{
 
  *this = right;
}

//______________________________________________________________________________
AliMpSectorAreaVPadIterator::AliMpSectorAreaVPadIterator()
 : AliMpVPadIterator(),
   fkSegmentation(0),
   fkArea(AliMpArea()),
   fCurrentPad(AliMpPad::Invalid()),
   fCurrentColumnPosition(0.)
{
}

//______________________________________________________________________________
AliMpSectorAreaVPadIterator::~AliMpSectorAreaVPadIterator()
{
}

//
// operators
//

//______________________________________________________________________________
AliMpSectorAreaVPadIterator& 
AliMpSectorAreaVPadIterator::operator = (const AliMpSectorAreaVPadIterator& right)
{

  // check assignment to self
  if (this == &right) return *this;

  // base class assignment
  AliMpVPadIterator::operator=(right);

  fkSegmentation = right.fkSegmentation;
  fkArea         = right.fkArea;
  fCurrentPad    = right.fCurrentPad;
  fCurrentColumnPosition = right.fCurrentColumnPosition;

  return *this;
} 

// 
// private methods
//

//______________________________________________________________________________
Bool_t AliMpSectorAreaVPadIterator::IsValid() const
{

  return fCurrentPad.IsValid() ;
}

//______________________________________________________________________________
void AliMpSectorAreaVPadIterator::MoveRight()
{

  Double_t dx = fkSegmentation->GetMinPadDimensionX();

  while ( !fCurrentPad.IsValid() && 
          fCurrentColumnPosition + dx < fkArea.RightBorder())
  {
    fCurrentColumnPosition += 2.*dx;
    
    fCurrentPad 
      = fkSegmentation->PadByDirection(fCurrentColumnPosition, fkArea.DownBorder(), 
                                       fkArea.UpBorder());
  } 
}

//
// public methods
//

//______________________________________________________________________________
void AliMpSectorAreaVPadIterator::First()
{

  if (!fkSegmentation) {
    AliFatal("Segmentation is not defined");
    return;
  }  

  // Start position = left down corner of the area
  //
  fCurrentColumnPosition = fkArea.LeftBorder();

  Double_t posx, posy;
  fkArea.LeftDownCorner(posx, posy); 
  
  fCurrentPad = fkSegmentation->PadByDirection(posx, posy, fkArea.UpBorder());
  
  MoveRight();

  // Set the column position to the center of pad
  //
  if (fCurrentPad.IsValid()) fCurrentColumnPosition = fCurrentPad.GetPositionX();
}

//______________________________________________________________________________
void AliMpSectorAreaVPadIterator::Next()
{

  if (!IsValid()) return;
  
  // Start position = up board of current pad + little step
  //
  fCurrentPad 
    = fkSegmentation->PadByDirection(
        fCurrentPad.GetPositionX(), 
        fCurrentPad.GetPositionY() + fCurrentPad.GetDimensionY() + 
          AliMpConstants::LengthStep(), 
        fkArea.UpBorder());  
  
  if (fCurrentPad.IsValid()) return;

  MoveRight();
}

//______________________________________________________________________________
Bool_t AliMpSectorAreaVPadIterator::IsDone() const
{
 
  return !IsValid();
}

//______________________________________________________________________________
AliMpPad AliMpSectorAreaVPadIterator::CurrentItem () const 
{

  return fCurrentPad;
}
//______________________________________________________________________________
void AliMpSectorAreaVPadIterator::Invalidate()
{
 
  fCurrentPad = AliMpPad::Invalid();
  fCurrentColumnPosition = 0;
}