cv2把鼠标当画笔

cv2把鼠标当画笔

本篇博客主要介绍通过pyhon中的cv2模块实现将鼠标当做画笔。

下面是示例代码：

import cv2
import numpy as np


drawing = False
ix, iy = -1, -1


def draw_circle(event, x, y, flags, param):
    global ix, iy, drawing, mode
    if event == cv2.EVENT_LBUTTONDOWN:
        drawing = True
        ix, iy = x, y
    elif event == cv2.EVENT_MOUSEMOVE and flags == cv2.EVENT_FLAG_LBUTTON:
        if drawing is True:
            if mode is True:
                cv2.rectangle(img, (ix, iy), (x, y), (0, 255, 0), -1)
            else:
                cv2.circle(img, (x, y), 3, (0, 0, 255), -1)

    elif event == cv2.EVENT_LBUTTONUP:
        drawing = False


img = np.zeros((512, 512, 3), np.uint8)

mode = False

cv2.namedWindow('image', 0)
cv2.setMouseCallback('image', draw_circle)
while True:
    cv2.imshow('image', img)
    k = cv2.waitKey(1)
    if k == ord('m'):
        mode = not mode
    elif k == ord('q'):
        break

结果示例：