docstr: Generate min area quad from poly.
docstr_tok: ["Generate","min","area","quad","from","poly","."]
code: def gen_min_area_quad_from_poly(self, poly):
      """
      Generate min area quad from poly.
      """
      point_num = poly.shape[0]
      min_area_quad = np.zeros((4, 2), dtype=np.float32)
      if point_num == 4:
          min_area_quad = poly
          center_point = np.sum(poly, axis=0) / 4
      else:
          rect = cv2.minAreaRect(
              poly.astype(np.int32)
          )  # (center (x,y), (width, height), angle of rotation)
          center_point = rect[0]
          box = np.array(cv2.boxPoints(rect))
  
          first_point_idx = 0
          min_dist = 1e4
          for i in range(4):
              dist = (
                  np.linalg.norm(box[(i + 0) % 4] - poly[0])
                  + np.linalg.norm(
                      box[(i + 1) % 4] - poly[point_num // 2 - 1]
                  )
                  + np.linalg.norm(
                      box[(i + 2) % 4] - poly[point_num // 2]
                  )
                  + np.linalg.norm(box[(i + 3) % 4] - poly[-1])
              )
              if dist < min_dist:
                  min_dist = dist
                  first_point_idx = i
  
          for i in range(4):
              min_area_quad[i] = box[(first_point_idx + i) % 4]
  
      return min_area_quad, center_point
  
imports: import math
  import cv2
  import numpy
  import json
  import sys
  import os
label_desc: Use image node_id 11 for calling the SASTProcessTrain obj's underlying member method code with example usage: obj.gen_min_area_quad_from_poly(poly) and returns: min_area_quad,  center_point