python_opencv用线段画封闭矩形的实例
如下所示：
def draw_circle(event,x,y,flags,param):
global ix,iy,drawing,mode,start_x,start_y
if event == cv2.EVENT_LBUTTONDOWN:
if drawing == False:
start_x, start_y = x,y
ix,iy = x,y
drawing = True
elif drawing == True:
cv2.line(img,(ix,iy),(x,y),(0,255,0),3)
ix, iy = x, y
print(drawing)
elif event == cv2.EVENT_MBUTTONDOWN:
drawing = False
cv2.line(img, (ix, iy), (start_x, start_y), (0, 255, 0), 3)
print(drawing)
#
# elif event == cv2.EVENT_RBUTTONUP:
# cv2.line(img,(ix,iy),(x,y),(0,255,0),3)
# Next we have to bind this mouse callback function to OpenCV # # window. In the main loop, we should set a keyboard binding for
# key ‘m' to toggle between rectangle and circle.
img = np.zeros((512,512,3), np.uint8)
cv2.namedWindow('image')
cv2.setMouseCallback('image',draw_circle)
while(1):
cv2.imshow('image',img)
k = cv2.waitKey(1) & 0xFF
if k == ord('m'): # 切换模式
mode = not mode
elif k == 27:
break
cv2.destroyAllWindows()
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