opencv gui之常用的画图接口示例-01

1. 画图结果

2. 代码

# -*- coding: utf-8 -*-
# @Time    : 2021/1/31 下午4:36
# @Author  : zxq
# @File    : func.py
# @Software: PyCharm

import numpy as np
import cv2 as cv

# Create a black image
img = np.zeros((512, 512, 3), np.uint8)

# line
# Draw a diagonal blue line with thickness of 5 px
cv.line(img, (0, 0), (511, 511), (255, 0, 0), 5)

# rectangle
cv.rectangle(img, pt1=(384, 0), pt2=(510, 128), color=(0, 255, 0), thickness=3)

# circle
cv.circle(img, (447, 63), radius=63, color=(0, 0, 255), thickness=-1)

# ellipse
# angle: rotation angle,
cv.ellipse(img, center=(256, 256), axes=(100, 50), angle=90, startAngle=90, endAngle=180, color=255, thickness=-1)

# Polygon
pts = np.array([[10, 5], [20, 30], [70, 20], [50, 10]], np.int32)
pts = pts.reshape((-1, 1, 2))  # (4, 2)->(4, 1, 2)
cv.polylines(img, pts=[pts, pts+40], isClosed=True, color=(0, 255, 255))

cv.namedWindow('img', 0), cv.imshow('img', img), cv.waitKey()