static double getEffectiveRatio()

in Transform360/Library/VideoFrameTransform.cpp [154:182]

• 27 lines of code
• 3 McCabe index (conditional complexity)

static double getEffectiveRatio(double angularDist, double offset, double fov) {
  double majorAxisScaling;
  if (angularDist - kEpsilon > fov / 2) {
    if (angularDist + fov / 2 > M_PI) {
      double edge1 = samplingArc(offset,
        (2 * M_PI - angularDist - fov / 2) * 2) / 2;
      double edge2 = samplingArc(offset, (angularDist - fov / 2) * 2) / 2;
      majorAxisScaling = (2 * M_PI - edge1 - edge2) / fov;
    } else {
      majorAxisScaling = (samplingArc(offset, 2 * angularDist + fov) -
      samplingArc(offset, 2 * angularDist - fov)) / 2 / fov;
    }
  } else {
    majorAxisScaling = (samplingArc(offset, 2 * angularDist + fov) +
      samplingArc(offset, fov - 2 * angularDist)) / 2 / fov;
  }

  double distToCoVertex = angularDistance(
    angularDist,
    0.5 * fov,
    0.0,
    0.0);
  double minorAxisScaling = samplingArc(
    offset, distToCoVertex * 2) / (distToCoVertex * 2);

  return min(
    majorAxisScaling * minorAxisScaling * sphericalArea(fov) / kSphereArea,
    1.0);
}