//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in:                      *
// *   http://cern.ch/geant4/license                                  *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.                                                             *
// *                                                                  *
// * This  code  implementation is the  intellectual property  of the *
// * GEANT4 collaboration.                                            *
// * By copying,  distributing  or modifying the Program (or any work *
// * based  on  the Program)  you indicate  your  acceptance of  this *
// * statement, and all its terms.                                    *
// ********************************************************************
//
//
// $Id: G4ParameterisedNavigation.icc,v 1.5 2005/06/14 16:09:43 japost Exp $
// GEANT4 tag $Name: geant4-08-00 $
//
// 
// class G4ParameterisedNavigation Inline implementation
//
// --------------------------------------------------------------------

// ********************************************************************
// ParamVoxelLocate
// ********************************************************************
//
inline
G4SmartVoxelNode*
G4ParameterisedNavigation::ParamVoxelLocate( G4SmartVoxelHeader* pHead,
                                       const G4ThreeVector& localPoint )
{
  // If no parameterisation axis is specified, adopt default
  // location strategy as for placements
  //  
  if ( pHead->GetParamAxis()==kUndefined )
  {
    fVoxelNode = G4VoxelNavigation::VoxelLocate(pHead,localPoint);
  }
  else
  {
    G4double targetHeaderMin, targetHeaderNodeWidth;
    G4int targetHeaderNoSlices, targetNodeNo;
    EAxis targetHeaderAxis;

    targetHeaderAxis = pHead->GetAxis();
    targetHeaderNoSlices = pHead->GetNoSlices();
    targetHeaderMin = pHead->GetMinExtent();
    targetHeaderNodeWidth = (pHead->GetMaxExtent()-targetHeaderMin)
                          / targetHeaderNoSlices;
    targetNodeNo = G4int ( (localPoint(targetHeaderAxis)-targetHeaderMin)
                           / targetHeaderNodeWidth );
    // Rounding protection
    //
    if ( targetNodeNo<0 )
    {
      targetNodeNo = 0;
    }
    else if ( targetNodeNo>=targetHeaderNoSlices )
         {
           targetNodeNo = targetHeaderNoSlices-1;
         }
    fVoxelAxis = targetHeaderAxis;
    fVoxelNoSlices = targetHeaderNoSlices;
    fVoxelSliceWidth = targetHeaderNodeWidth;
    fVoxelNodeNo = targetNodeNo;
    fVoxelHeader = pHead;    
    fVoxelNode = pHead->GetSlice(targetNodeNo)->GetNode();
  }
  return fVoxelNode;
}