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
···
On 6/6/07, Nicolas <nico_75_0@...136...> 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 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 <jdh2358@…287…> wrote:
On 6/6/07, Nicolas <nico_75_0@…136…> 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