畫板畫圖
import cv2
import numpy as np
def nothing(x):
pass
drawing=False
mode=True
ix,iy=-1,-1
def draw_circle(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 ix,iy,drawing,mode
if event==cv2.EVENT_LBUTTONDOWN:
drawing=True
ix,iy=x,y
elif event==cv2.EVENT_MOUSEMOVE and flags==cv2.EVENT_FLAG_LBUTTON:
if drawing==True:
if mode==True:
cv2.rectangle(img,(ix,iy),(x,y),color,-1)
else:
cv2.circle(img,(x,y),3,color,-1)
elif event==cv2.EVENT_LBUTTONUP:
drawing=False
if mode==True:
cv2.rectangle(img,(ix,iy),(x,y),(0,255,0),-1)
else:
cv2.circle(img,(x,y),5,(0,0,255),-1)
img = np.zeros((512,512,3),np.uint8)
cv2.namedWindow('image')
cv2.createTrackbar('R','image',0,255,nothing)
cv2.createTrackbar('G','image',0,255,nothing)
cv2.createTrackbar('B','image',0,255,nothing)
cv2.setMouseCallback('image',draw_circle)
while(1):
cv2.imshow('image',img)
k=cv2.waitKey(1)&0xFF
if k==ord('m'):
mode=not mode
elif k==27:
break
