Polylines (img, point set, whether closed loop, color,...)
Img: specify which picture to draw on
Point set: it is the point we need to draw, and must be 32-bit
Closed loop or not: decide whether to connect together finally
import cv2
import numpy as np
# 绘制一个黑色背景图
img=np.zeros((480,640,3),np.uint8)
# 画多边形
pts=np.array([(320,240),(100,50),(450,100)],np.int32)
cv2.polylines(img,[pts],True,(0,0,255))
# 填充多边形
cv2.fillPoly(img,[pts],(0,255,0))
# 显示
cv2.imshow('img',img)
cv2.waitKey(0)
