SymmetryOperation.h

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//
//
/*
    Copyright (C) 2000 PARAPET partners
    Copyright (C) 2000- 2009, Hammersmith Imanet Ltd
    This file is part of STIR.

    SPDX-License-Identifier: Apache-2.0 AND License-ref-PARAPET-license

    See STIR/LICENSE.txt for details
*/
#ifndef __stir_recon_buildblock_SymmetryOperation_H__
#define __stir_recon_buildblock_SymmetryOperation_H__

#include "stir/common.h"

START_NAMESPACE_STIR

template <int num_dimensions, class coordT>
class BasicCoordinate;
class ViewSegmentNumbers;
class ProjMatrixElemsForOneBin;
class ProjMatrixElemsForOneDensel;
class Bin;

class SymmetryOperation
{
public:
  virtual inline ~SymmetryOperation() {}
  virtual inline bool is_trivial() const { return false; }
  virtual void transform_bin_coordinates(Bin&) const = 0;
  virtual void transform_view_segment_indices(ViewSegmentNumbers&) const = 0;
  virtual void transform_image_coordinates(BasicCoordinate<3, int>&) const = 0;
#if 0
  // would be useful at some point
  virtual void 
    transform_incremental_image_coordinates(BasicCoordinate<3,int>&) const = 0;
#endif

  virtual void transform_proj_matrix_elems_for_one_bin(ProjMatrixElemsForOneBin& lor) const;

  virtual void transform_proj_matrix_elems_for_one_densel(ProjMatrixElemsForOneDensel&) const;
};

class TrivialSymmetryOperation : public SymmetryOperation
{
public:
  inline bool is_trivial() const override { return true; }
  inline void transform_bin_coordinates(Bin& b) const override {}
  inline void transform_view_segment_indices(ViewSegmentNumbers& n) const override {}
  inline void transform_image_coordinates(BasicCoordinate<3, int>& c) const override {}
  inline void transform_proj_matrix_elems_for_one_bin(ProjMatrixElemsForOneBin& lor) const override {}

  void transform_proj_matrix_elems_for_one_densel(ProjMatrixElemsForOneDensel&) const override {}
};

END_NAMESPACE_STIR

//#include "stir/recon_buildblock/SymmetryOperation.inl"

#endif