TransformedAperture.cpp

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/*
 * TransformedAperture.cpp
 *
 *  Created on: Oct 08, 2018
 *      Author: Alejandro Alvarez
 */
 
#include "SEFramework/Aperture/TransformedAperture.h"
#include <algorithm>
 
namespace SourceXtractor {
 
TransformedAperture::TransformedAperture(std::shared_ptr<Aperture> decorated,
                                         const std::tuple<double, double, double, double> &jacobian)
  : m_decorated{decorated} {
 
  m_transform[0] = std::get<0>(jacobian);
  m_transform[1] = std::get<1>(jacobian);
  m_transform[2] = std::get<2>(jacobian);
  m_transform[3] = std::get<3>(jacobian);
 
  double inv_det = 1. / (m_transform[0] * m_transform[3] - m_transform[2] * m_transform[1]);
 
  m_inv_transform[0] = m_transform[3] * inv_det;
  m_inv_transform[1] = -m_transform[1] * inv_det;
  m_inv_transform[2] = -m_transform[2] * inv_det;
  m_inv_transform[3] = m_transform[0] * inv_det;
}
 
inline std::pair<double, double> transform(int x, int y, const std::array<double, 4> &t) {
  return {
    x * t[0] + y * t[2],
    x * t[1] + y * t[3]
  };
}
 
PixelCoordinate TransformedAperture::getMinPixel(SeFloat x, SeFloat y) const {
  auto min = m_decorated->getMinPixel(0, 0);
  auto max = m_decorated->getMaxPixel(0, 0);
 
  auto a = transform(min.m_x, min.m_y, m_transform);
  auto b = transform(max.m_x, min.m_y, m_transform);
  auto c = transform(min.m_x, max.m_y, m_transform);
  auto d = transform(max.m_x, max.m_y, m_transform);
 
  auto min_x = std::min({a.first, b.first, c.first, d.first});
  auto min_y = std::min({a.second, b.second, c.second, d.second});
 
  return PixelCoordinate(x + min_x, y + min_y);
}
 
PixelCoordinate TransformedAperture::getMaxPixel(SeFloat x, SeFloat y) const {
  auto min = m_decorated->getMinPixel(0, 0);
  auto max = m_decorated->getMaxPixel(0, 0);
 
  auto a = transform(min.m_x, min.m_y, m_transform);
  auto b = transform(max.m_x, min.m_y, m_transform);
  auto c = transform(min.m_x, max.m_y, m_transform);
  auto d = transform(max.m_x, max.m_y, m_transform);
 
  auto min_x = std::max({a.first, b.first, c.first, d.first});
  auto min_y = std::max({a.second, b.second, c.second, d.second});
 
  return PixelCoordinate(x + min_x, y + min_y);
}
 
SeFloat TransformedAperture::getArea(SeFloat center_x, SeFloat center_y, SeFloat pixel_x, SeFloat pixel_y) const {
  auto diff_x = pixel_x - center_x;
  auto diff_y = pixel_y - center_y;
 
  SeFloat new_diff_x = diff_x * m_inv_transform[0] + diff_y * m_inv_transform[2];
  SeFloat new_diff_y = diff_x * m_inv_transform[1] + diff_y * m_inv_transform[3];
 
  return m_decorated->getArea(0, 0, new_diff_x, new_diff_y);
}
 
SeFloat TransformedAperture::drawArea(SeFloat center_x, SeFloat center_y, SeFloat pixel_x, SeFloat pixel_y) const {
  auto diff_x = pixel_x - center_x;
  auto diff_y = pixel_y - center_y;
 
  SeFloat new_diff_x = diff_x * m_inv_transform[0] + diff_y * m_inv_transform[2];
  SeFloat new_diff_y = diff_x * m_inv_transform[1] + diff_y * m_inv_transform[3];
 
  return m_decorated->drawArea(0, 0, new_diff_x, new_diff_y);
}
 
SeFloat TransformedAperture::getRadiusSquared(SeFloat center_x, SeFloat center_y, SeFloat pixel_x, SeFloat pixel_y) const {
  auto diff_x = pixel_x - center_x;
  auto diff_y = pixel_y - center_y;
 
  SeFloat new_diff_x = diff_x * m_inv_transform[0] + diff_y * m_inv_transform[2];
  SeFloat new_diff_y = diff_x * m_inv_transform[1] + diff_y * m_inv_transform[3];
 
  return m_decorated->getRadiusSquared(0, 0, new_diff_x, new_diff_y);
}
 
} // end SourceXtractor