OpenCV之鼠标操作绘制图形

短命女 2024-05-28 10:22 104阅读 0赞

#coding=utf-8
    
    import cv2
    import numpy as np
    # 全局变量
    drawing = False  # 是否开始绘制
    mode = 'none'  # 当前绘制模式
    start_x, start_y = -1, -1  # 绘制起点坐标
    
    # 鼠标回调函数
    def draw_shape(event, x, y, flags, param):
        global drawing, start_x, start_y, mode
    
        if (event & cv2.EVENT_LBUTTONDOWN == cv2.EVENT_LBUTTONDOWN):
            drawing = True
            start_x, start_y = x, y
    
        elif (event & cv2.EVENT_LBUTTONUP == cv2.EVENT_LBUTTONUP):
            drawing = False
            if mode == 'rectangle':
                cv2.rectangle(img, (start_x, start_y), (x, y), (0, 255, 0), 2)
                print("矩形坐标：", (start_x, start_y), (x, y))
            elif mode == 'circle':
                radius = int(((x - start_x)**2 + (y - start_y)**2)**0.5)
                cv2.circle(img, (start_x, start_y), radius, (0, 0, 255), 2)
                print("圆形坐标：", (start_x, start_y), "半径：", radius)
            elif mode == 'line':
                cv2.line(img, (start_x, start_y), (x, y), (255, 0, 0), 2)
                print("直线坐标：", (start_x, start_y), (x, y))
    # 创建空白图像
    img = np.zeros((512, 512, 3), np.uint8)
    
    # 创建窗口并绑定鼠标回调函数
    cv2.namedWindow('Drawing', cv2.WINDOW_NORMAL)
    cv2.setMouseCallback('Drawing', draw_shape)
    
    # 显示绘制界面，按下键盘按键来绘制图形
    while True:
        cv2.imshow('Drawing', img)
        key = cv2.waitKey(1) & 0xFF
    
        if key == ord('r'):
            mode = 'rectangle'
        elif key == ord('c'):
            mode = 'circle'
        elif key == ord('l'):
            mode = 'line'
        elif key == 27 or key == ord('q'):  # 按下 ESC 键退出
            break
    
    cv2.destroyAllWindows()