Re: [matplotlib-devel] Contourf draws contour lines

[S. v. d. W. <st...@su...>]

On 20/04/2008, Eric Firing <ef...@ha...> wrote:
>  I don't see any contour lines; I see only the boundaries between patches.
> In other words, the plot looks the way I would expect it to. This is with
> evince or gv on a linux machine.  (Both fail when trying to blow up the plot
> to 400%, but work at 200%.)

Attached is the script that generates the contour plot I'm interested
in.  A PNG cropped from the PS onscreen is at

http://mentat.za.net/refer/contour_zoom.png

It's small, but the line should be clearly visible.

>  My sense is that there is an optical illusion effect making the boundaries
> look somewhat line-like, but it doesn't sound like this is what you are
> talking about, so I am baffled.

Could be -- maybe an interpolation effect?  Odd thing is that the
lines are differently coloured.  In fact, I can get *only* the lines
to render by commenting out certain lines in contour.py.

>  Do you see the problem if you run contourf_demo.py and use the gui to
> generate png, pdf, and ps files from figure 1?  I still can't see any sign
> of it anywhere.

I see contour lines, as shown here:

http://mentat.za.net/refer/contour_demo.png

>  Would you send a png file generated with and without your workaround,
> please?  That should get around any differences in postscript interpreters.

They are here:

http://mentat.za.net/refer/contours_without_patch.png
http://mentat.za.net/refer/contours_with_patch.png

>  It sounds like you are seeing something fairly subtle that I am having a
> hard time seeing, and that is new with the transforms branch.

I don't want to waste your time further with this problem, so if you
think the above png's look fine then I'll just use my workaround.  It
might be a problem very specific to my setup.

Thanks for your time,
Stéfan