import numpy as np
def order_points(pts):
  #input format
  #pts = [(x1,y1),(x2,y2),(x3,y3),(x4,y4)]

  #sort points by x
  tmp = sorted(pts, key=lambda point: point[0])

  #tmp[0] and tmp[1] is left point
  #determine, which is top, and which is bottom by y coordinate
  if tmp[0][1] > tmp[1][1]:
    tl = tmp[1]
    bl = tmp[0]
  else:
    tl = tmp[0]
    bl = tmp[1]

  #do it with right tmp[2] and tmp[3]
  if tmp[2][1] > tmp[3][1]:
    tr = tmp[3]
    br = tmp[2]
  else:
    tr = tmp[2]
    br = tmp[3]

  return np.array([tl,tr,br,bl])