MuonShieldFactory.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) CERN for the benefit of the SHiP Collaboration
 
#pragma once
 
#include <GeoModelKernel/Units.h>
 
class GeoPhysVol;
 
namespace SHiPGeometry {
 
class SHiPMaterials;
 
class MuonShieldFactory {
   public:
    explicit MuonShieldFactory(SHiPMaterials& materials);
    ~MuonShieldFactory() = default;
 
    [[nodiscard]] GeoPhysVol* build();
 
   private:
    SHiPMaterials& m_materials;
 
    // Unit shorthand (GeoModel's native length unit is mm)
    static constexpr double mm = GeoModelKernelUnits::mm;
 
    struct PieceData {
        double halfX, halfY, halfZ;  // bounding-box half-sizes
        double centX, centY;         // centre offset in station XY frame
        const char* name;            // piece name suffix
    };
 
    struct StationData {
        const char* name;  // station name
        double stationZ;   // z in MuonShieldArea frame
        double containerHalfX;
        double containerHalfY;
        double containerHalfZ;
        PieceData pieces[8];
    };
 
    // GDML-derived station data for all 6 stations × 8 pieces
    static const StationData k_stations[6];
 
    GeoPhysVol* buildStation(const StationData& station);
 
    // MuonShieldArea container dimensions
    static constexpr double s_areaHalfX = 1810.0 * mm;
    static constexpr double s_areaHalfY = 1700.0 * mm;
    static constexpr double s_areaHalfZ = 14724.0 * mm;
};
 
}  // namespace SHiPGeometry