ResizeRectangularDetectorHelper.cpp

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2018 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#include "MantidAPI/ResizeRectangularDetectorHelper.h"
#include "MantidGeometry/IComponent.h"
#include "MantidGeometry/Instrument/ComponentInfo.h"
#include "MantidKernel/EigenConversionHelpers.h"
 
namespace Mantid::API {
 
void applyRectangularDetectorScaleToComponentInfo(Geometry::ComponentInfo &componentInfo,
                                                  Geometry::ComponentID componentId, const double scaleX,
                                                  const double scaleY) {
 
  const size_t componentIndex = componentInfo.indexOf(componentId);
  // Precompute transformation: Undo translation, undo rotation, scale, rotate
  // back, translate back:
  Eigen::Affine3d transformation(Eigen::Scaling(Eigen::Vector3d(scaleX, scaleY, 1)));
  const auto rotation = toQuaterniond(componentInfo.rotation(componentIndex));
  transformation.rotate(rotation.conjugate());
  transformation.prerotate(rotation);
  const auto origin = Kernel::toVector3d(componentInfo.position(componentIndex));
  transformation.translate(-origin);
  transformation.pretranslate(origin);
 
  for (auto index : componentInfo.detectorsInSubtree(componentIndex)) {
    auto newPos = Kernel::toV3D(transformation * Kernel::toVector3d(componentInfo.position(index)));
    componentInfo.setPosition(index, newPos);
  }
}
 
} // namespace Mantid::API