On Tue, Sep 7, 2010 at 10:09 AM, John Porter <jpor...@cambridgesys.com> wrote: > I was checking the performance of the GtkAgg and Qt4Agg backends and noticed > that the Qt4Agg backend calls canvas.draw 3 times for every pylab.show() > The three calls are: > backend_qt4.py::65 > manager.window.show()->resizeEvent->draw > backend_qt4.py::71 > figManager.canvas.draw() > backend_qtagg4.py::69 > FigureCanvasQTAgg.paintEvent -> FigureCanvasAgg.draw(self) > show() in backend_qt4.py includes the extra call to figManager.canvas.draw > compared to the gtk backend. It doesn't seem to be necessary. > There is a 'replot' flag in the canvas.draw function in FigureCanvasQTAgg > which looks as though it should be True in order to prevent the extra draw > in paintEvent.
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