python-opencv实现简易画图板,供大家参考,具体内容如下
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | # -*- 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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