Mouse_draw_circle.py 深藏阁楼爱情的钟 2022-07-13 02:42 119阅读 0赞 \# -\*- coding: utf-8 -\*- """ Created on Sun Jan 5 14:59:58 2014 @author: duan """ import cv2 import numpy as np def nothing(x): pass \# 当鼠标按下时变为True drawing=False \# 如果mode 为true 绘制矩形。按下'm' 变成绘制曲线。 mode=True ix,iy=-1,-1 \# 创建回调函数 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 \# 当按下左键是返回起始位置坐标 if event==cv2.EVENT\_LBUTTONDOWN: drawing=True ix,iy=x,y \# 当鼠标左键按下并移动是绘制图形。event 可以查看移动，flag 查看是否按下 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: \# 绘制圆圈，小圆点连在一起就成了线，3 代表了笔画的粗细 cv2.circle(img,(x,y),3,color,-1) \# 下面注释掉的代码是起始点为圆心，起点到终点为半径的 \# r=int(np.sqrt((x-ix)\*\*2+(y-iy)\*\*2)) \# cv2.circle(img,(x,y),r,(0,0,255),-1) \# 当鼠标松开停止绘画。 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
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