本文主要是介绍python+opencv鼠标操作以及制作调色板并画图，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
鼠标操作：
#!/usr/bin/env pythonimport numpy as np
import cv2events=[i for i in dir(cv2) if 'EVENT' in i]
#events=[i for i in dir(cv2)]
print eventsdef draw_circle(event, x, y, flags, param):if event == cv2.EVENT_LBUTTONDBLCLK:cv2.circle(img, (x, y), 100, (255,0,0), -1)img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image', draw_circle)while(True):cv2.imshow('image', img)if cv2.waitKey(20)&0xff == 27:breakcv2.deltroyAllWindows()
跟随鼠标移动进行绘制矩形或者画圆
#!/usr/bin/env pythonimport numpy as np
import cv2drawing = False
mode = True
ix, iy = -1, -1def draw_circle(event, x, y, flags, param):global ix, iy, drawing, modeif event == cv2.EVENT_LBUTTONDOWN:print 'left button down'drawing = Trueix, iy = x,y#elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:elif event == cv2.EVENT_MOUSEMOVE:print 'mouse move'if drawing == True:if mode == True:cv2.rectangle(img, (ix, iy), (x,y), (0,255,0), -1)else:cv2.circle(img, (x, y), 10, (255,0,0), -1)elif event == cv2.EVENT_LBUTTONUP:print 'left button up'drawing = Falseimg = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image', draw_circle)while(True):cv2.imshow('image', img)k = cv2.waitKey(1)&0xffif k == ord('m'):print 'you typed key m'mode = not modeelif k == 27:break
制作调色板：
#!/usr/bin/env pythonimport numpy as np
import cv2def def_func(x):passimg = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')cv2.createTrackbar('R','image',0,255,def_func)
cv2.createTrackbar('G','image',0,255,def_func)
cv2.createTrackbar('B','image',0,255,def_func)switch = '0:OFF\n1:ON'
cv2.createTrackbar(switch,'image',0,1,def_func)while(True):cv2.imshow('image', img)k = cv2.waitKey(1)&0xffif k == 27:breakr = cv2.getTrackbarPos('R', 'image')g = cv2.getTrackbarPos('G', 'image')b = cv2.getTrackbarPos('B', 'image')s = cv2.getTrackbarPos(switch, 'image')if s == 0:img[:] = 0else:img[:] = [b,g,r]cv2.destroyAllWindows()
制作一个画板，可以选择颜色，然后移动鼠标画图：
#!/usr/bin/env pythonimport numpy as np
import cv2drawing = False
mode = True
ix, iy = -1, -1def def_func(x):passdef 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, modeif event == cv2.EVENT_LBUTTONDOWN:print 'left button down'drawing = Trueix, iy = x,y#elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:elif event == cv2.EVENT_MOUSEMOVE:print 'mouse move'if drawing == True:if mode == True:cv2.rectangle(img, (ix, iy), (x,y), color, -1)else:cv2.circle(img, (x, y), 10, color, -1)elif event == cv2.EVENT_LBUTTONUP:print 'left button up'drawing = Falseimg = np.zeros((512,512,3), np.uint8)cv2.namedWindow('image')cv2.createTrackbar('R','image',0,255,def_func)
cv2.createTrackbar('G','image',0,255,def_func)
cv2.createTrackbar('B','image',0,255,def_func)cv2.setMouseCallback('image', draw_circle)while(True):cv2.imshow('image', img)k = cv2.waitKey(1)&0xffif k == ord('m'):print 'you typed key m'mode = not modeelif k == 27:breakcv2.destroyAllWindows()
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