message: Extract PlanetRadius as a constant
diff: namespace {
  - constexpr auto PlanetSize = NAS2D::Vector<int>{128, 128};
  + constexpr auto PlanetRadius = 64;
  + constexpr auto PlanetSize = NAS2D::Vector<int>{PlanetRadius * 2, PlanetRadius * 2};
  }
  @@ -58,7 +59,8 @@ bool Planet::pointInArea(NAS2D::Point<int> point)
  // Standard point in circle equation. Magic numbers for a circle diameter of 128.
  // Note: assumes all values are always positive.
  const auto offset = point - mPosition - PlanetSize / 2;
  - return ((offset.x * offset.x) + (offset.y * offset.y) <= 4096);
  + constexpr auto radiusSquared = PlanetRadius * PlanetRadius;
  + return ((offset.x * offset.x) + (offset.y * offset.y) <= radiusSquared);
  }
  