python-opencv實現簡易畫圖板，供大家參考，具體內容如下

# -*- coding: utf-8 -*-'''Created on Sat May 19 17:34:54 2018@author: xxx'''import cv2 as cvimport numpy as npdef nothing(x): pass# 當鼠標按下時變為 Truedrawing = False# 如果 mode 為 True 繪制矩形。按下 ’m’ 變成繪制曲線mode = Trueix, iy = -1, -1#創建回調函數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 # 當按下左鍵是返回起始位置坐標 if event == cv.EVENT_LBUTTONDOWN: drawing = True ix, iy = x, y# 當鼠標左鍵按下并移動是繪制圖形。event 可以查看移動, 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:# 繪制圓圈，小圓點連在一起就成了線，3代表畫筆的粗細cv.circle(img, (ix, iy), 3, color, -1)# 下面注釋的代碼是起始點為圓心，起點到終點為半徑#r = int(np.sqrt((x - ix)**2 + (y - iy)**2))#cv.circle(img, (x, y), r, (0, 0, 255), -1)# 當鼠標松開停止繪畫 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)#創建一幅黑色圖形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: breakcv.destroyAllWindow()

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