DDLinear.cc

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#include "DD4hep/DetFactoryHelper.h"
#include "DataFormats/Math/interface/GeantUnits.h"
#include "DetectorDescription/DDCMS/interface/DDPlugins.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <Math/Cartesian3D.h>
#include <Math/DisplacementVector3D.h>

using namespace std;
using namespace dd4hep;
using namespace cms;
using namespace geant_units::operators;

using DD3Vector = ROOT::Math::DisplacementVector3D<ROOT::Math::Cartesian3D<double> >;

static long algorithm( Detector& /* description */,
               cms::DDParsingContext& ctxt,
               xml_h e,
               SensitiveDetector& /* sens */)
{
  cms::DDNamespace ns( ctxt, e, true );
  DDAlgoArguments  args( ctxt, e );

  int            n           = args.value<int>("N");
  int            startCopyNo = args.find("StartCopyNo") ? args.value<int>("StartCopyNo") : 1;
  int            incrCopyNo  = args.find("IncrCopyNo") ? args.value<int>("IncrCopyNo") : 1;
  double         theta       = args.find("Theta") ? args.value<double>("Theta") : 0.;
  double         phi         = args.find("Phi") ? args.value<double>("Phi") : 0.;
  double         delta       = args.find("Delta") ? args.value<double>("Delta") : 0.;
  vector<double> base        = args.value<vector<double> >("Base");
  Volume         mother      = ns.volume(args.parentName());
  Volume         child       = ns.volume(args.value<string>("ChildName"));
  int            copy        = startCopyNo;
 
  LogDebug("DDAlgorithm") << "DDLinear: Parameters for positioning:: n "
              << n << "  Direction Theta, Phi, Delta "
              << convertRadToDeg( theta ) << " " 
              << convertRadToDeg( phi ) << " " << convertRadToDeg( delta )
              << " Base " << base[0]
              << ", " << base[1] << ", " << base[2];

  LogDebug("DDAlgorithm") << "DDLinear: Parent " << mother.name() 
              << "\tChild " << child.name() << " NameSpace "
              << ns.name();

  Position direction( sin( theta ) * cos( phi ),
              sin( theta ) * sin( phi ),
              cos( theta ));
             
  Position basetr( base[0], base[1], base[2] );           
                
  Rotation3D rotation = Rotation3D(); // Identity rotation
  
  for( int i = 0; i < n; ++i )
  {
    Position tran = basetr + ( double( copy ) * delta ) * direction;          
    mother.placeVolume( child, copy, Transform3D( rotation, tran ));
    LogDebug( "DDAlgorithm" ) << "DDLinear: " << child.name()  << " number " 
                            << copy << " positioned in " << mother.name() << " at "
                            << tran  << " with " << rotation;

    copy += incrCopyNo;
  }

  return 1;
}

// first argument is the type from the xml file
DECLARE_DDCMS_DETELEMENT( DDCMS_global_DDLinear, algorithm )