EllipticalAperture.cpp

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/*
 * EllipticalAperture.cpp
 *
 *  Created on: Oct 08, 2018
 *      Author: Alejandro Alvarez
 */
 
#include "SEFramework/Aperture/EllipticalAperture.h"
#include <iostream>
namespace SourceXtractor {
 
 
EllipticalAperture::EllipticalAperture(SeFloat cxx, SeFloat cyy, SeFloat cxy,
                                       SeFloat rad_max)
  : m_cxx{cxx}, m_cyy{cyy}, m_cxy{cxy}, m_rad_max{rad_max} {
}
 
  SeFloat EllipticalAperture::getArea(SeFloat center_x, SeFloat center_y, SeFloat pixel_x, SeFloat pixel_y) const {
        if (getRadiusSquared(center_x, center_y, pixel_x, pixel_y) < m_rad_max * m_rad_max) {
 
                return 1.0;
        }
        return 0.;
  }
 
  SeFloat EllipticalAperture::drawArea(SeFloat center_x, SeFloat center_y, SeFloat pixel_x, SeFloat pixel_y) const {
          SeFloat thickness = 1.0;
          SeFloat min_rad_squared = m_rad_max > thickness ? (m_rad_max - thickness) * (m_rad_max - thickness) : 0;
 
          //SeFloat min_rad_squared = .877777*(m_rad_max*m_rad_max);
          //SeFloat min_rad_squared = .877777*(m_rad_max*m_rad_max);
          //SeFloat min_rad_squared = .133333*(m_rad_max*m_rad_max) > 6.0 ? .877777*(m_rad_max*m_rad_max) : (m_rad_max*m_rad_max)-6.0;
 
          //SeFloat max_rad_squared = (m_rad_max + thickness) * (m_rad_max + thickness);
 
          //if (min_supersampled_radius_squared < distance_squared && distance_squared <= max_supersampled_radius_squared) {
          //if ((m_rad_max-1.)*(m_rad_max-1.)< distance_squared && distance_squared < m_rad_max * m_rad_max) {
          //if ((m_rad_max*m_rad_max-thickness)< distance_squared && distance_squared < (m_rad_max * m_rad_max)) {
          //if (fabs(distance_squared - (m_rad_max * m_rad_max)) < thickness) {
 
          auto distance_squared = getRadiusSquared(center_x, center_y, pixel_x, pixel_y);
          if (min_rad_squared < distance_squared && distance_squared < (m_rad_max * m_rad_max)) {
          //if (min_rad_squared < distance_squared && distance_squared < max_rad_squared) {
                  return 1.0;
          }
          return 0.;
  }
 
SeFloat EllipticalAperture::getRadiusSquared(SeFloat center_x, SeFloat center_y, SeFloat pixel_x,
                                             SeFloat pixel_y) const {
  auto dist_x = SeFloat(pixel_x) - center_x;
  auto dist_y = SeFloat(pixel_y) - center_y;
 
  return m_cxx * dist_x * dist_x + m_cyy * dist_y * dist_y + m_cxy * dist_x * dist_y;
}
 
PixelCoordinate EllipticalAperture::getMinPixel(SeFloat centroid_x, SeFloat centroid_y) const {
  SeFloat dx, dy;
 
  // compute the maximum extend in x/y
  dx = m_rad_max * std::sqrt(1.0 / (m_cxx - m_cxy * m_cxy / (4.0 * m_cyy)));
  dy = m_rad_max * std::sqrt(1.0 / (m_cyy - m_cxy * m_cxy / (4.0 * m_cxx)));
 
  // return the absolute values
  return PixelCoordinate(centroid_x - dx, centroid_y - dy);
}
 
PixelCoordinate EllipticalAperture::getMaxPixel(SeFloat centroid_x, SeFloat centroid_y) const {
  SeFloat dx, dy;
 
  // compute the maximum extend in x/y
  dx = m_rad_max * std::sqrt(1.0 / (m_cxx - m_cxy * m_cxy / (4.0 * m_cyy)));
  dy = m_rad_max * std::sqrt(1.0 / (m_cyy - m_cxy * m_cxy / (4.0 * m_cxx)));
 
  // return the absolute values
  return PixelCoordinate(centroid_x + dx + 1, centroid_y + dy + 1);
}
 
} // end SourceXtractor