在PyQt5中将图像插入QGridLayout并在图像顶部绘制

from PyQt5.QtWidgets import QApplication, QWidget, QLabel, QGridLayout
from PyQt5.QtGui import QPixmap, QPainter, QPen
from PyQt5.QtCore import Qt

class ImageWindow(QWidget):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        # 创建一个QGridLayout布局管理器
        gridLayout = QGridLayout(self)

        # 创建一个QLabel用于显示图像
        self.imageLabel = QLabel(self)
        gridLayout.addWidget(self.imageLabel, 0, 0)

        # 设置窗口布局为QGridLayout
        self.setLayout(gridLayout)

    def paintEvent(self, event):
        # 在图像顶部绘制内容
        painter = QPainter(self)
        painter.setPen(QPen(Qt.red, 2))
        painter.drawLine(0, 0, self.width(), 0)

if __name__ == '__main__':
    app = QApplication(sys.argv)
    window = ImageWindow()
    window.show()
    sys.exit(app.exec_())

image = QPixmap('path/to/image.jpg')
window.imageLabel.setPixmap(image)