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opencv四:鼠标事件

时间:2023-02-18 10:06:43浏览次数:30  
标签:鼠标 img image cv2 event opencv mode EVENT 事件


 查看所有鼠标事件:

import cv2
events = [i for i in dir(cv2) if 'EVENT' in i]
print(events)

运行结果:['EVENT_FLAG_ALTKEY', 'EVENT_FLAG_CTRLKEY', 'EVENT_FLAG_LBUTTON', 'EVENT_FLAG_MBUTTON', 'EVENT_FLAG_RBUTTON', 'EVENT_FLAG_SHIFTKEY', 'EVENT_LBUTTONDBLCLK', 'EVENT_LBUTTONDOWN', 'EVENT_LBUTTONUP', 'EVENT_MBUTTONDBLCLK', 'EVENT_MBUTTONDOWN', 'EVENT_MBUTTONUP', 'EVENT_MOUSEHWHEEL', 'EVENT_MOUSEMOVE', 'EVENT_MOUSEWHEEL', 'EVENT_RBUTTONDBLCLK', 'EVENT_RBUTTONDOWN', 'EVENT_RBUTTONUP']

鼠标左键双击画圆:

import cv2
import numpy as np
def draw_circle(event,x,y,flags,param):
if event == cv2.EVENT_LBUTTONDBLCLK:
cv2.circle(img,(x,y),20,(255,0,0),-1)
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(1)==27):
break
cv2.destroyAllWindows()

鼠标弹起画圆,拖拉画矩形:

import cv2
import numpy as np

drawing = False
mode = True ix,iy = -1,-1

# mouse callback function
def draw_circle(event,x,y,flags,param):
global ix,iy,drawing,mode
if event == cv2.EVENT_LBUTTONDOWN:
drawing = True
mode = True
ix,iy = x,y
elif event == cv2.EVENT_MOUSEMOVE:
mode = False
if drawing == True:
cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),-1)
elif event == cv2.EVENT_LBUTTONUP:
drawing = False
if mode==True:
cv2.circle(img,(x,y),20,(0,0,255),-1)

img = np.zeros((512,512,3),np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)
while(1):
cv2.imshow('image',img)
k = cv2.waitKey(1)
if k == ord('m'):
mode = not mode
elif k == 27:
break
cv2.destroyAllWindows()

 

标签:鼠标,img,image,cv2,event,opencv,mode,EVENT,事件
From: https://blog.51cto.com/u_14036511/6065050

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