docs: def intersects_circle(self, pt, radius):
      """Does the circle intersect with this rect?"""
      # How this works: http://stackoverflow.com/a/402010
      rect_corner = self.size / 2  # relative to the rect center
      circle_center = (pt - self.center).abs()  # relative to the rect center
  
      # Is the circle far from the rect?
      if (circle_center.x > rect_corner.x + radius or
          circle_center.y > rect_corner.y + radius):
        return False
  
      # Is the circle center inside the rect or near one of the edges?
      if (circle_center.x <= rect_corner.x or
          circle_center.y <= rect_corner.y):
        return True
  
      # Does the circle contain the corner of the rect?
      return circle_center.dist_sq(rect_corner) <= radius**2