本文实例讲述了python基于opencv实现的简单画板功能。分享给大家供大家参考，具体如下：
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import cv2import numpy as npdrawing = false # true if mouse is pressedix,iy = -1,-1def nothing(x): pass# mouse callback functiondef draw_circle(event,x,y,flags,param): global ix,iy,drawing g = param[0] b = param[1] r = param[2] shape = param[3] if event == cv2.event_lbuttondown: drawing = true ix,iy = x,y elif event == cv2.event_mousemove: if drawing == true: if shape == 0: cv2.rectangle(img,(ix,iy),(x,y),(g,b,r),-1) else: cv2.circle(img,(x,y),5,(g,b,r),-1) elif event == cv2.event_lbuttonup: drawing = false if shape == 0: cv2.rectangle(img,(ix,iy),(x,y),(g,b,r),-1) else: cv2.circle(img,(x,y),5,(g,b,r),-1)# create a black image, a windowimg = np.zeros((300,512,3), np.uint8)cv2.namedwindow('image')# create trackbars for color changecv2.createtrackbar('r','image',0,255,nothing)cv2.createtrackbar('g','image',0,255,nothing)cv2.createtrackbar('b','image',0,255,nothing)# create switch for on/off functionalityswitch1 = '0 : off \n1 : on'switch2 = '0: rectangle \n1: line 'cv2.createtrackbar(switch1, 'image',0,1,nothing)cv2.createtrackbar(switch2, 'image',0,1,nothing)while(1): cv2.imshow('image',img) k = cv2.waitkey(1) & 0xff # get current positions of four trackbars if k == 27: break r = cv2.gettrackbarpos('r','image') g = cv2.gettrackbarpos('g','image') b = cv2.gettrackbarpos('b','image') shape = cv2.gettrackbarpos(switch2,'image') s = cv2.gettrackbarpos(switch1,'image') if s == 0: img[:] = 0 else: if k == 27: break cv2.setmousecallback('image',draw_circle,(b,g,r,shape))cv2.destroyallwindows() |
运行效果：
希望本文所述对大家python程序设计有所帮助。
原文链接：https://blog.csdn.net/xuminnju/article/details/79588161
