On 01/30/2013 05:03 PM, Benjamin Root wrote:
On Tue, Jan 29, 2013 at 5:12 PM, Mads Ipsen <mads.ip...@gmail.com
<mailto:mads.ip...@gmail.com>> wrote:
Hi,
I spend some time writing up the question below on Stackoverflow
which immediately was closed as a duplicate of other posts. To my
best knowledge, these posts did not answer my questions - so I'll
try my luck here instead:
I am using the qt backengine for setting up a QWidget that embeds
a matplotlib scene. When the widget is closed it appears that many
of the matplotlib objects that were part of the plot still are
alive in Python space.
My question is basically the following: What actions should I take
to clean up the figure and axes objects etc. that were part of the
plot widget? The qt backend comes with a figure manager, but it
appears a little unclear how it should be used.
I have attached a small unit test example that sets up a plot.
When the plot appears, just close it, and the test will garbage
collects the plot, and then display info of the matplotlib objects
that are still alive in Python space. Clearly both the path of the
plot, and several Bbox objects are still referenced.
Our current unit test suite contains almost 10000 GUI tests and
its imperative that proper object space clean up is done after
each test. Any help is much appreciated.
Best regards,
Mads
Would "fig.clf()" do what you need?
Ben Root
Thanks for the feedback.
The trick is to get this done automatically when the widget is closed.
If you look in backend_qt4.py in the constructor of FigureCanvasQT
you'll find
QtCore.QObject.connect(self, QtCore.SIGNAL('destroyed()'),
self.close_event)
which should perform the steps below when close_event is called
event = CloseEvent(s, self, guiEvent=guiEvent)
self.callbacks.process(s, event)
If I insert print statements, the signal is ignored with matplotlib
1.1.0, but called with 1.2.0 (which uses a lambda function in the above
connection).But inspecting pythons objects after the close() method is
called on the widget, it seems that - at least - the paths associated
with plot actually still exist.
So I'm just a bit worried if there already is existing functionality in
the FigureCanvasQTAgg object that can do these things for me. And if so,
how to use them?
Best regards,
Mads
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