QCustomPlot Discussion and Comments

I'm using PySide2 and qcp and I'd like to set the fill style on a QCPItemEllipse instance. The docs say you need to create a QPen, the set its QBrush. I have tried this but nothing happened. Here is a minimal reproducable example which you should be able to just run on its own:

from PySide2.QtCore import QPointF
from PySide2.QtGui import QBrush, QPen, Qt, QRadialGradient
from PySide2.QtWidgets import QApplication, QWidget, QVBoxLayout

import sys

from qcustomplot_pyside2 import QCPItemEllipse, QCustomPlot

app = QApplication(sys.argv)

window = QWidget()
window.setFixedSize(500, 500)
window.setLayout(QVBoxLayout())

qcustomplot = QCustomPlot()
window.layout().addWidget(qcustomplot)


ellipse = QCPItemEllipse(qcustomplot)
ellipse.bottomRight.setCoords(-2, -2)
ellipse.topLeft.setCoords(2, 2)
pen = QPen()


brush = QBrush(QRadialGradient(QPointF(310, 180), 200))
pen.setBrush(brush)
pen.setColor(Qt.magenta)
ellipse.setPen(pen)

qcustomplot.replot()
qcustomplot.update()
qcustomplot.updateGeometry()
window.update()
window.show()
app.exec_()