> I don't see it.
You're right.  I've looked at it again and I can confirm that the
outlines are drawn with LINETOs.
> This shows a set of vertices with a matching set of LINETO (after an
> initial MOVETO). contour and contourf generate piecewise linear paths
> with vertices on grid cell boundaries; they make no attempt to smooth
> out the contours.
I looked at the example in
http://matplotlib.sourceforge.net/examples/pylab_examples/contourf_log.html
and used the point information in the LINETOs to reproduce the figure.
It seems that, except for the blue patches in the corners, this
information is really rough. Take a peek at the file I attached; left:
matplotlib rendering, right: lines manually redrawn.
Do you know what's going on?
Nico
On Tue, Dec 13, 2011 at 11:39 PM, Eric Firing <efiring@...> wrote:
> On 12/13/2011 11:03 AM, Nico Schlömer wrote:
>> Hi all,
>>
>> when drawing contourf plots, I inspected the underlying
>> matplotlib.path.Path elements that determine the curves and noticed
>> that they are all of code LINETO (see
>> http://matplotlib.sourceforge.net/api/path_api.html#matplotlib.path.Path)
>> although the number of vertices is 6, actually suggesting a CURVE4.
>>
>> Would that be a bug?
>
> I don't see it.
>
> x = np.arange(9)
> x.shape = (3,3)
> cs = contourf(x, 1)
> print cs.collections.get_paths()
>
> This shows a set of vertices with a matching set of LINETO (after an
> initial MOVETO). contour and contourf generate piecewise linear paths
> with vertices on grid cell boundaries; they make no attempt to smooth
> out the contours.
>
> Eric
>
>>
>> Cheers,
>> Nico
>
>
> 
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