ConvexPolygonIterator.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 +
//-----------------------------------------------------------------------------
// Includes
//-----------------------------------------------------------------------------
#include "MantidGeometry/Math/ConvexPolygon.h"
#include "MantidGeometry/Math/PolygonEdge.h"
#include "MantidKernel/Exception.h"
 
namespace Mantid::Geometry {
 
//-----------------------------------------------------------------------------
// Public member functions
//-----------------------------------------------------------------------------
ConvexPolygon::Iterator::Iterator(const ConvexPolygon &polygon) : m_polygon(polygon), m_index(0) {
  if (!polygon.isValid()) {
    throw std::invalid_argument("Cannot create iterator for invalid polygon.");
  }
}
 
const Kernel::V2D &ConvexPolygon::Iterator::operator*() const { return m_polygon[m_index]; }
 
void ConvexPolygon::Iterator::operator++() { m_index = nextIndex(); }
 
PolygonEdge ConvexPolygon::Iterator::edge() const { return PolygonEdge(**this, m_polygon[nextIndex()]); }
 
//-----------------------------------------------------------------------------
// Private member functions
//-----------------------------------------------------------------------------
size_t ConvexPolygon::Iterator::nextIndex() const { return (m_index + 1) % m_polygon.npoints(); }
 
} // namespace Mantid::Geometry