[Matplotlib-users] Correct way of saving properties for plot reconstruction

[Andrew Nelson]

Dear list,
apologies for what might be a simple question. I am creating an application
that uses matplotlib for plotting, using the Qt4Agg backend.  I can create
the figures without a problem.

However, I wish to save the state of the application, including the graphs.
 The complicating factor is that the user may have altered the appearance
of the graphs via a NavigationToolbar.

I have no problems saving the data that makes up the graphs, but how do I
save the properties of the graphs (line colour, linewidth, etc)?
I tried using matplotlib.artist.ArtistInspector(Line2D).properties(). This
gives a dictionary of all the properties. However, when I try to pickle
this I get picking errors:

cPickle.PicklingError: Can't pickle :
attribute lookup matplotlib.axes.AxesSubplot failed

I am sure that there is an easy way of achieving this, I just can't see it
in the documentation.  I appreciate any help the list is able to give me.

regards,
Andrew



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Dr. Andrew Nelson


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Re: [Matplotlib-users] Impossible to draw a direction of arrows in Matplotlib???

[andrew nelson]

> 
> Message: 1
> Date: Fri, 12 Apr 2013 13:55:32 +0400
> From: Bakhtiyor Zokhidov 
> Subject: [Matplotlib-users] Impossible to draw a direction of arrows
>   in Matplotlib???
> 
> Hi,
> I have encountered some problem while I was drawing a direction of
> arrow. I have point (x,y) coordinates and angle of them. What I want to
> do is that to draw arrow according to the given angle (just to show the
> point direction as an arrow in each point coordinate). Here, we should
> assume coordinates of '+x', '+y', '-x ', '-y' are 90, 0, 270, 180
> degrees, respectively.?
> I am a bit unfamiliar with Python drawing tools. I am still not sure to
> draw directional point (arrow based on angle) whether I use pylab or
> some other modules or.. still not sure at all. I put the following codes
> as a sample to give better description:




I see the potential for some confusion over the direction of arrows on a plot 
here.  In standard trigonometry angles of 0, 90, 180, 270 degrees lie along 
'+x' (1, 0), '+y' (0, 1), '-x' (-1, 0) and '-y' (0, -1).  Totally different to 
what you want.  However, this is obviously different to the compass rose.





Dr Andrew Nelson
andyf...@gmail.com
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