gistfile1.txt

from PySide2.QtCore import QTimer, QObject, SIGNAL
from PySide2.QtGui import QResizeEvent
from PySide2.QtWidgets import QApplication, QWidget, QLabel, QMainWindow
from PySide2.QtSvg import QSvgWidget

import sys

class AppWindow(QMainWindow):
    def __init__(self, parent=None):
        super(AppWindow, self).__init__(parent)
        self.central = QSvgWidget("test_svg.svg")
        self.foo = QLabel("foo", parent=self.central)
        self.setCentralWidget(self.central)
        self.align_label_to_rectangle()

    def resizeEvent(self, event: QResizeEvent) -> None:
        super(AppWindow, self).resizeEvent(event)
        print('need recalculation')
        self.align_label_to_rectangle()

    def align_label_to_rectangle(self):
        print('viewBoxF', self.central.renderer().viewBoxF())
        print('x, y', self.central.x(), self.central.y())
        print('size', self.central.size())
        bound1 = self.central.renderer().boundsOnElement("foo")
        print(bound1)
        transform = self.central.renderer().transformForElement("foo")
        print(transform)
        bound2 = transform.mapRect(bound1)
        print(bound2)
        tl = bound2.topLeft()
        x_linear_k = self.central.width() / self.central.renderer().viewBoxF().width()
        y_linear_k = self.central.height() / self.central.renderer().viewBoxF().height()
        print(tl)
        self.foo.move(x_linear_k * tl.x(), y_linear_k * tl.y())


app = QApplication(sys.argv)

window = AppWindow()
window.show()

app.exec_()