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.
John
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