绘制形状

import cv2
import numpy as np

img = np.ones((512, 512, 3), np.uint8)
img = 255 * img
img = cv2.line(img, (100, 100), (400, 400), (255, 0, 0), 5)
img = cv2.rectangle(img, (200, 20), (400, 120), (0, 255, 0), 3)
img = cv2.circle(img, (100, 400), 50, (0, 0, 255), 2)
img = cv2.circle(img, (250, 400), 50, (0, 0, 255), 0)
img = cv2.ellipse(img, (256, 256), (100, 50), 0, 0, 180, (0, 255, 255), -2)
pts = np.array([[10, 5], [20, 30], [70, 20], [50, 10]], np.int32)
img = cv2.polylines(img, [pts], True, (0, 0, 0), 2)

cv2.imshow('white_img', img)

if cv2.waitKey(0) == 27:
    cv2.destroyAllWindows()