Re: [Matplotlib-users] Qt4 Example timing out

[Benjamin R. <ben...@ou...>]

On Tue, Sep 17, 2013 at 11:55 AM, Chad Kidder <cck...@gm...> wrote:

> I'm following the MPL Qt4 example given at
> http://matplotlib.org/examples/user_interfaces/embedding_in_qt4.html and
> it looks like I am timing out somewhere in the setup.  The error I am
> getting is:
>
> RuntimeError: super-class __init__() of type MyDynamicMplCanvas was never
> called
>
> It's timing out on a function that goes and talks to a piece of test
> equipment to get some data to plot.  That function takes on the order of a
> second to complete and is located in compute_initial_figure(self): for the
> previously mentioned class.  I will need to make these calls whenever I go
> into the update routine and they may take a few seconds to update.
>
> First, where is the "timeout" that I am violating?  Second, how do I fix
> this?  Thanks for your help.
>
>
>     --Chad Kidder
>
>
Hi Chad,

I think the timeout is right over here:

class MyDynamicMplCanvas(MyMplCanvas):
    """A canvas that updates itself every second with a new plot."""
    def __init__(self, *args, **kwargs):
        MyMplCanvas.__init__(self, *args, **kwargs)
        timer = QtCore.QTimer(self)
        QtCore.QObject.connect(timer, QtCore.SIGNAL("timeout()"),
self.update_figure)
        timer.start(1000)

My suspicion would be to either bump up that timer to take more than a
second, or come up with a different signal function to more intelligently
handle refreshes.

Cheers!
Ben Root