python openCV自制绘画板

本文实例为大家分享了python openCV自制绘画板的具体代码，供大家参考，具体内容如下

import numpy as np
import cv2
def nothing(x):
 pass
cv2.namedWindow('image')
img = np.zeros((512,512,3),np.uint8)
cv2.createTrackbar('R','image',0,255,nothing)
cv2.createTrackbar('G','image',0,255,nothing)
cv2.createTrackbar('B','image',0,255,nothing)
drawing = False
mode = True
ix,iy = -1,-1
def drawing_fragment(event,x,y,flags,param):
 r = cv2.getTrackbarPos('R','image')
 g = cv2.getTrackbarPos('G','image')
 b = cv2.getTrackbarPos('B','image')
 color = (b,g,r)
 global drawing,ix,iy,mode
 if event == cv2.EVENT_LBUTTONDOWN:
   drawing = True
   ix = x
   iy = y
 elif event == cv2.EVENT_MOUSEMOVE:
   if drawing:
     if mode:
       cv2.rectangle(img,(ix,iy),(x,y),color,-1)
     else:
       cv2.circle(img,(x,y),5,color,-1)
 elif event == cv2.EVENT_LBUTTONUP:
   drawing = False

cv2.setMouseCallback('image',drawing_fragment)
while True:
 cv2.imshow('image',img)
 k = cv2.waitKey(2)
 if k == 27:
   break
 elif k == ord('q'):
   mode = not mode
cv2.destroyAllWindows()

测试效果

来源：https://blog.csdn.net/weixin_43635647/article/details/103803642