FTLayer.h

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#pragma once
 
#include <cmath>
 
class FTLayer {
 
public:
  FTLayer( const float radius, const float stereoAngle, const float zf, const float zb,
           const float offset, const int layerID, const int localLayerID, const int nwire )
      : _radius( radius )
      , _tanSlant( 1. / std::tan( stereoAngle ) )
      , _zf( zf )
      , _zb( zb )
      , _layerId( layerID )
      , _offset( offset )
      , _localLayerId( localLayerID )
      , _nwire( nwire ) {}
 
  ~FTLayer() = default;
 
public: // Selectors
  /// returns local-layer ID
  const int localLayerId() const { return _localLayerId; }
 
  /// returns layer ID
  const int layerId() const { return _layerId; }
 
  /// returns the number of wire
  const int NWire() const { return _nwire; }
 
  /// returns tangent of slant angle
  const float tanSlant() const { return _tanSlant; }
 
  /// returns r form origin
  const float r() const { return _radius; }
 
  /// returns z of forward end-plate
  const float zf() const { return _zf; }
 
  /// returns z of backward end-plate
  const float zb() const { return _zb; }
 
  /// returns offset of numbering(local ID)
  const float offset() const { return _offset; }
 
  /// returns limit of "d" for stereo layer
  const double limit() const { return ( _zf - _zb ) / _tanSlant; }
 
  /// returns z for "d" in r-phi plane
  double z( const double d ) const { return _zb + d * _tanSlant; }
 
  /// returns cell size
  double csize() const { return 2 * M_PI * _radius / NWire(); }
 
private: // private data members
  const float _radius;
  const float _tanSlant;
  const float _zf; // z of forward endplate
  const float _zb; // z of backward endplate
  const float _offset;
  const int   _layerId;
  const int   _localLayerId;
  const int   _nwire;
};