python 鼠标 画框 打印坐标位置 高宽

#!/usr/bin/python
# -*- coding: utf-8 -*-
# @Time : 2021/8/22 22:28 
# @Author : yangdj 553849374@qq.com
# @File : img_draw_rectangle.py 
# @Software: PyCharm
# 在图片中选取roi并用鼠标画出矩形框

import cv2

img = cv2.imread(r"F:\python\pytool-httpapi\static\upload\temp_files\2021-08-21\0a5f89c640124aa4b1659ade7a5e0c29.jpg")

drawing = False
ix, iy = -1, -1
tempFlag = False


def draw_circle(event, x, y, flags, param):
    global ix, iy, drawing, mode, cap, template, tempFlag
    if event == cv2.EVENT_LBUTTONDOWN:
        tempFlag = True
        drawing = True
        ix, iy = x, y  # 按下鼠标左键，用全局变量ix,iy记录下当前坐标点
    elif event == cv2.EVENT_LBUTTONUP:
        if drawing == True:
            drawing = False  # 鼠标左键抬起，画出矩形框
            cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), 1)
            template = img[iy:y, ix:x, :]  # 截取框中的目标图像
            # 打印两个点的坐标，和最终原点+宽和高
            print((ix, iy), (x, y), f'{ix},{iy},{x - ix},{y - iy}')
            # cap = cv2.VideoCapture(-1)       #打开摄像头
            # cv2.imshow('img', img)  # 显示画框后的图像
            cv2.imshow('template', template)


cv2.namedWindow("image")
cv2.setMouseCallback("image", draw_circle)
cv2.imshow("image", img)

while (True):
    try:
        cv2.waitKey(100)
    except Exception:
        cv2.destroyAllWindows()
        break

cv2.waitKey(0)
cv2.destroyAllWindows()