可以画任意曲线,按下鼠标画曲线
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Tue Oct 24 17:36:48 2017
@author: fs
"""
import cv2
events=[i for i in dir(cv2) if 'EVENT'in i]
print( events )#查看所有的鼠标事件
'''
CV_EVENT_MOUSEMOVE =0, //鼠标移动
CV_EVENT_LBUTTONDOWN =1, //按下左键
CV_EVENT_RBUTTONDOWN =2, //按下右键
CV_EVENT_MBUTTONDOWN =3, //按下中键
CV_EVENT_LBUTTONUP =4, //放开左键
CV_EVENT_RBUTTONUP =5, //放开右键
CV_EVENT_MBUTTONUP =6, //放开中键
CV_EVENT_LBUTTONDBLCLK =7, //左键双击
CV_EVENT_RBUTTONDBLCLK =8, //右键双击
CV_EVENT_MBUTTONDBLCLK =9, //中键双击
CV_EVENT_MOUSEWHEEL =10, //滚轮滚动
CV_EVENT_MOUSEHWHEEL =11 //横向滚轮滚动
CV_EVENT_FLAG_LBUTTON =1, //左键拖拽
CV_EVENT_FLAG_RBUTTON =2, //右键拖拽
CV_EVENT_FLAG_MBUTTON =4, //中键拖拽
CV_EVENT_FLAG_CTRLKEY =8, //按住CTRL拖拽
CV_EVENT_FLAG_SHIFTKEY =16, //按住Shift拖拽
CV_EVENT_FLAG_ALTKEY =32 //按住ALT拖拽
'''
import cv2
import numpy as np
#mouse callback function
def draw_circle(event,x,y,flags,param):
if event== cv2.EVENT_MOUSEMOVE and flags ==33:
cv2.circle(img,(x,y),10,(255,0,0),-1)
# 创建图像与窗口并将窗口与回调函数绑定
img=np.zeros((512,512,3),np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)
while(1):
cv2.imshow('image',img)
if cv2.waitKey(20)&0xFF==27:
break
cv2.destroyAllWindows()
cv2.waitKey(1)
cv2.waitKey(1)
cv2.waitKey(1)
cv2.waitKey(1)