学习opencv的setMouseCallBack()函数

    1. import cv2 as cv
    2. import numpy as np
    5. # 鼠标的回调函数
    6. def draw_circie(event, x, y, flags, param):
    7.     if event == cv.EVENT_LBUTTONDBLCLK:
    8.         cv.circle(img, (x, y), 100, (255, 0, 0), -1)
    11. # 创建一个黑色图像
    12. img = np.zeros((512, 512, 3), np.uint8)
    13. # 面板
    14. cv.namedWindow("xx")
    15. # 绑定鼠标
    16. cv.setMouseCallback("xx", draw_circie)
    17. while True:
    18.     cv.imshow("xx", img)
    19.     if cv.waitKey(25) == 27:
    20.         break
    21. cv.destroyWindow("images")

    鼠标点击绘制

    1. import numpy as np
    2. import cv2 as cv
    5. # 鼠标回调函数
    6. def draw_circle(event, x, y, flags, param):
    7.     global ix, iy, drawing, mode
    8.     if event == cv.EVENT_LBUTTONDOWN:
    9.         drawing = True
    10.         ix, iy = x, y
    11.     elif event == cv.EVENT_MOUSEMOVE:
    12.         if drawing == True:
    13.             if mode == True:
    14.                 cv.rectangle(img, (ix, iy), (x, y), (0, 255, 0), -1)
    15.             else:
    16.                 cv.circle(img, (x, y), 5, (0, 0, 255), -1)
    17.     elif event == cv.EVENT_LBUTTONUP:
    18.         drawing = False
    19.         if mode == True:
    20.             cv.rectangle(img, (ix, iy), (x, y), (0, 255, 0), -1)
    21.         else:
    22.             cv.circle(img, (x, y), 5, (0, 0, 255), -1)
    25. drawing = False  # 如果按下鼠标，则为真
    26. mode = True  # 如果为真，绘制矩形。按 m 键可以切换到曲线
    27. ix, iy = -1, -1
    29. img = np.zeros((512, 512, 3), np.uint8)
    31. cv.namedWindow('image')
    32. cv.setMouseCallback('image', draw_circle)
    33. while True:
    34.     cv.imshow("image", img)
    35.     if cv.waitKey(25) == 27:
    36.         break
    37. cv.destroyAllWindows()