Re: [Matplotlib-users] does mpl.canvas has a flag "needsdrawing"?

[Werner F. B. <wer...@fr...>]

John,

John Hunter wrote:
> On Fri, Sep 18, 2009 at 4:39 AM, Werner F. Bruhin <wer...@fr...> wrote:
>   
>> I have multiple canvas and sometimes one or more might have nothing to
>> draw (no data).
>>
>> Currently I just call.
>>
>> canvas.draw()
>> canvas.Refresh()
>>
>> for each of the canvas, but this gives me an error if there is no data.
>>
>> Is there a built-in flag I can check before calling draw?  Or do I have
>> to keep create my own?
>>     
>
> There is no such flag, but you should not get an error on drawing an
> empty figure or one that doesn't "need" to be drawn.  Can you post
> example code that produces the error?
>   
I narrowed it down to one line of code, if I comment the following line
then the error goes away.

        axes.xaxis.set_major_formatter(yearFmt)

Is this enough for you?  Or do you like some runnable code?

Werner