mine-hack radius function

def calculate_radius(point1, point2):
  # print "Calculating distance between points:"
  # print point1
  # print point2
  if point1 is None:
    return 10
  p1 = np.array(point1["location"])
  p2 = np.array(point2["location"])
  dist = np.linalg.norm(p1 - p2)
  time_delta = point2["time"] - point1["time"]
  # print "dist: %f" % dist
  # print "time delta: %i" % time_delta
  blocks_per_second = (dist / time_delta) * 1000
  # print "blocks per second: %f" % blocks_per_second
  return int(round(blocks_per_second))