Re: [Matplotlib-users] RE : Re: RE : Re: transformations

[Nicolas <nic...@ya...>]

I can't figure why Polygons are used even when I simply draw lines.
But I know at least why I use empty list of vertices. ;)
In fact, I use matplotlib for a dynamic geometry software (something like
GeoGebra), and systematic use of high-level functions of matplotlib would be
to slow for that purpose.
And yet, I didn't want to use too low-level functions, like the renderer's
ones, for I didn't want to depend too much of a particular renderer.

So, I created once a set of plots and fills for every object, and then I
modified its attributes . I used to set its vertices to an empty list when I
didn't want it to appear on the figure.
I suppose now I'd better use instead something like.
    my_plot._visible = False

Nevertheless, I think empty vertices should be supported here (or not
supported at all for all renderers - for in 0.90.1 it still works with tkagg
for example)

Nicolas



On 6/6/07, John Hunter <jd...@gm...> wrote:
>
> On 6/6/07, Nicolas <nic...@ya...> wrote:
>
> > Unfortunately, I didn't use instantiated Polygon items myself, so for
> now I
> > can't figure which part of my code produces indirectly such empty
> > Polygons...
> >
> > May it be however possible to modify a little matplotlib code, so as to
> > assure the compatibility with the previous existing versions of
> matplotlib ?
> > Something like :
>
> I don't have a problem with this, but it just makes it easier for
> latent bugs in your code to remain hidden.  Should we raise in the
> Polygon constructor is you pass in an empty list of vertices?  Of
> course, you can always set xy directly, so this won't catch all the
> errors unless we use properties or traits.
>
> JDH
>