homography.py 文件源码

def clear_image(self):
        """
        Call this to clear the image from this HomographyView's scene.
        The scene will be filled with a placeholder grey background and message.
        """
        new_scene = QtWidgets.QGraphicsScene(self)
        new_scene.setBackgroundBrush(QtGui.QBrush(QtGui.QColor(124, 124, 124)))
        txt = QtWidgets.QGraphicsSimpleTextItem("Compute homography to see results here.")
        new_scene.addItem(txt)
        self.setScene(new_scene)
        self.show()