Re: [Matplotlib-users] Matplotlib + py3 + gtk3 wouws

[Michael D. <md...@st...>]

On 02/27/2014 06:58 PM, Jon Roadley-Battin wrote:
> Good evening,
>
> I am at present migrating an application of mine from py27+pygtk (with 
> mpl) to py33+pygobject (gtk3)
>
> Unfortunately I am unable to use
>
> from  matplotlib.backends.backend_gtk3agg  import  FigureCanvasGTK3Agg  as  FigureCanvas
> from  matplotlib.backends.backend_gtk3  import  NavigationToolbar2GTK3  as  NavigationToolbar
>
> Which is is on the examples ( 
> http://matplotlib.org/examples/user_interfaces/embedding_in_gtk3_panzoom.html 
> ) but is also the logical translation from what I presently have.
> This falls fowl of the cairo issue
>
> What I am having to use is backend_gtk3cairo. However this is being 
> triggered
>
>  raise ValueError("The Cairo backend can not draw paths longer than 
> 18980 points.")
>
> I am generally plotting 7 x-y plots with upto 30,000 points.
> Now for now I have commented this out from my local install, is there 
> a better/preferred/recommended alternative?

This was put in there because cairo had (at least at the time) a hard 
coded limit on path size, and getting a Python exception was IMHO 
preferable to segfaulting and having the process go away.  Are you 
saying that when you comment it out, it's currently working?  It may be 
that cairo has fixed this limit in the intervening years. Can you 
provide a simple, standalone example that reproduces the error?

> I have read about cairocffi but this doesn't 
> seem conveniently possible at this moment in time (especially for 
> windows)

I'm not sure if the Python wrappers will matter, since this issue is 
actually in the underlying Cairo library.

>
> Equally I have seen mpl-devel mailing list entries from 4years ago 
> stating that this check was to be removed (a cairo 1.4.10 issue)

Are you referring to this thread?

http://matplotlib.1069221.n5.nabble.com/Path-length-in-the-cairo-backend-td36582.html

The conclusion there (if you scroll down) was that the check is still 
needed as of Cairo 1.8.

Mike

>
> JonRB
>
>
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