svg rendering in Qt (with pygal charts)
<p>I am trying to render styled pygal charts using Qt SVG renderer. But I still problems with background colors because it is black. Shouldn't it be controlled by the style of pygal chart? It should look like the first chart in <a href="http://www.pygal.org/en/stable/documentation/builtin_styles.html#darkstyle" rel="nofollow noreferrer">http://www.pygal.org/en/stable/documentation/builtin_styles.html#darkstyle</a></p>

<p><a href="https://i.stack.imgur.com/HNRme.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HNRme.png" alt="enter image description here"></a></p>

<pre><code>import sys
import pygal
from PySide import QtGui, QtSvg


class Chart(QtGui.QWidget):

    def __init__(self, parent=None):
        super(Chart, self).__init__(parent)

        chart = pygal.StackedLine(fill=True, interpolate='cubic',
                                  style=pygal.style.DefaultStyle)
                                  # or e.g. DarkSolarizedStyle
        chart.add('A', [1, 3, 5, 16, 13, 3, 7])
        chart.add('B', [5, 2, 3, 2, 5, 7, 17])
        chart.add('C', [6, 10, 9, 7, 3, 1, 0])
        chart.add('D', [2, 3, 5, 9, 12, 9, 5])
        chart.add('E', [7, 4, 2, 1, 2, 10, 0])
        svgSource = chart.render()
        self.renderer = QtSvg.QSvgRenderer()
        self.renderer.load(svgSource)

    def paintEvent(self, event):
        if self.renderer is not None:
            painter = QtGui.QPainter(self)
            self.renderer.render(painter)
            return True
        return super(Chart, self).paintEvent(event)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    window = Chart()
    window.show()
    result = app.exec_()
    sys.exit(result)
</code></pre>

<p>UPDATE: I get the same issue when using PyQt5, PyQt4, Pyside and also when using directly QSvgWidget. My suspicion is that it does not work because of failure in loading CSS files referenced in the SVG. Or it might be some limited scope of SVG specification which is supported by Qt as mentioned in <a href="https://stackoverflow.com/questions/33616382/does-qt-support-svg">Does QT support svg?</a>.</p>