def paint(self, painter, option, widget=None):
painter_inverted = QPainter()
brect= QGraphicsProxyWidget.boundingRect(self)
invertedColor = QImage(brect.width(),brect.height(),QImage.Format_RGB32)
painter_inverted.begin(invertedColor)
QGraphicsProxyWidget.paint(self,painter_inverted, option, widget)
painter_inverted.end()
painter.drawImage(0,0,invertedColor.rgbSwapped())
def boundingRect(self):
return QGraphicsProxyWidget.boundingRect(self).adjusted(0, 0, 0, 0);