鼠标交互切割矩形

接下来，就是本文重点了。先吐个槽，网上有资源，但搜到的都是C++的。本来有点气馁的，还好，有官网在，文档写得很清楚，而且接口函数名字变化不大，稍微做下修改就行了。

 
import cv2global img
global point1, point2
def on_mouse(event, x, y, flags, param):global img, point1, point2img2 = img.copy()if event == cv2.EVENT_LBUTTONDOWN:         #左键点击point1 = (x,y)cv2.circle(img2, point1, 10, (0,255,0), 5)cv2.imshow('image', img2)elif event == cv2.EVENT_MOUSEMOVE and (flags & cv2.EVENT_FLAG_LBUTTON):               #按住左键拖曳cv2.rectangle(img2, point1, (x,y), (255,0,0), 5)cv2.imshow('image', img2)elif event == cv2.EVENT_LBUTTONUP:         #左键释放point2 = (x,y)cv2.rectangle(img2, point1, point2, (0,0,255), 5) cv2.imshow('image', img2)min_x = min(point1[0],point2[0])     min_y