python opencv实现简易画图板

Love The Way You Lie 2022-12-23 07:17 179阅读 0赞

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python-opencv实现简易画图板，供大家参考，具体内容如下

# -*- coding: utf-8 -*-
    """
    Created on Sat May 19 17:34:54 2018

@author: xxx  
“”"

import cv2 as cv  
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 = cv.getTrackbarPos(‘R’, ‘image’)  
g = cv.getTrackbarPos(‘G’, ‘image’)  
b = cv.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 == cv.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 == cv.EVENT\_MOUSEMOVE and flags == cv.EVENT\_FLAG\_LBUTTON:  
if drawing == True:  
if mode == True:  
cv.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代表画笔的粗细  
cv.circle(img, (ix, iy), 3, color, -1)  
\# 下面注释的代码是起始点为圆心，起点到终点为半径

# r = int(np.sqrt((x - ix)\*\*2 + (y - iy)\*\*2)) #

# cv.circle(img, (x, y), r, (0, 0, 255), -1) #

# 当鼠标松开停止绘画 #

elif event == cv.EVENT\_LBUTTONUP:  
drawing == False

# if mode == True: #

# cv.rectangle(img, (ix, iy), (x, y), (0, 255, 0), -1) #

# else: #

# cv.circle(img, (x, y), 5, (0, 0, 255), -1) #

\#创建一幅黑色图形  
img = np.zeros((512, 512, 3), np.uint8)  
cv.namedWindow(‘image’)

cv.createTrackbar(‘R’, ‘image’, 0, 255, nothing)  
cv.createTrackbar(‘G’, ‘image’, 0, 255, nothing)  
cv.createTrackbar(‘B’, ‘image’, 0, 255, nothing)  
cv.setMouseCallback(‘image’, draw\_circle)

while(1):  
cv.imshow(‘image’, img)  
k = cv.waitKey(1)&0xFF  
if k == ord(‘m’):  
mode = not mode  
elif k==27:  
break

cv.destroyAllWindow()

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