效果图：

代码：

import os

from PyQt5.QtWidgets import QWidget, QApplication, QVBoxLayout, QPushButton, QLabel
from PyQt5.QtGui import QPainter, QPen, QColor, QImage, QPixmap
from PyQt5.QtCore import Qt, QPoint
import sys
import json

class ImageLabel(QLabel):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.setMouseTracking(True)

    def mouseMoveEvent(self, event):
        super().mouseMoveEvent(event)

class LineDrawer(QWidget):
    def __init__(self):
        super().__init__()

        self.drawing = False
        self.lines = []  # 存储所有的线
        self.start_point = QPoint()
        self.end_point = QPoint()
        # self.original_image = QImage(rf"F:\data\jupiter\det_no\train\1009\cc\0\0_1.00_100916_82853.jpg")
        self.original_im