def paintEvent(self, event):
if len(self.main_element) > 0:
renderer = self.renderer()
bounds = renderer.boundsOnElement(self.main_element)
svg_dx = bounds.width()
svg_dy = bounds.height()
svg_ratio = svg_dy / svg_dx
widget_dx = self.width()
widget_dy = self.height()
widget_ratio = widget_dy / widget_dx
if widget_ratio > svg_ratio:
# widget is taller than svg item so pick taller view
height = svg_dx * widget_ratio
extra = (height - svg_dy) / 2
margins = QMarginsF(0, extra, 0, extra)
elif widget_ratio < svg_ratio:
# widget is wider than svg item so pick wider view
width = svg_dy / widget_ratio
extra = (width - svg_dx) / 2
margins = QMarginsF(extra, 0, extra, 0)
else:
margins = QMarginsF()
bounds = bounds.marginsAdded(margins)
renderer.setViewBox(bounds)
QSvgWidget.paintEvent(self, event)
