Polygon examples broken

If your data is on a quadrilateral mesh, try using the pcolormesh
function. It is orders of magnitude faster than pcolor and we
solved the black lines problem by using transparency on the mesh
grid (though of course you can use 'flat' if you want). We only
implemented this for the Agg backend, otherwise it falls back to
the pcolor style rendering of a collection of polygons.

  - Paul

···

On Fri, Jul 20, 2007 at 08:53:30AM -0400, Rob Hetland wrote:

Second, much of what I do involves plotting model data (on a
curvilinear grid). I generally like to use pcolor for these plots.
I *always* want shading='flat' Some of my grids are large, and I
only see lines if I don't. Even with smaller grids, those black
lines get in the way. I don't want to suggest an RC setting for
everything, but this one single setting would save me thousands of
characters typed per week. Can we add an RC shading option?

Yes, pcolormesh works great. Still, when I use the default values [pcolormesh(x, y, z)] I get a Morrey (sp?) pattern instead of seeing the grid -- i.e., better than pcolor(..., shading='faceted'), but still not a great plot. Is it possible to set RC defaults to get the equivalent of shading='flat' in pcolormesh? As far as I know, it is not possible in pcolor.

-r

···

On Jul 20, 2007, at 9:07 AM, Paul Kienzle wrote:

On Fri, Jul 20, 2007 at 08:53:30AM -0400, Rob Hetland wrote:

Second, much of what I do involves plotting model data (on a
curvilinear grid). I generally like to use pcolor for these plots.
I *always* want shading='flat' Some of my grids are large, and I
only see lines if I don't. Even with smaller grids, those black
lines get in the way. I don't want to suggest an RC setting for
everything, but this one single setting would save me thousands of
characters typed per week. Can we add an RC shading option?

If your data is on a quadrilateral mesh, try using the pcolormesh
function. It is orders of magnitude faster than pcolor and we
solved the black lines problem by using transparency on the mesh
grid (though of course you can use 'flat' if you want). We only
implemented this for the Agg backend, otherwise it falls back to
the pcolor style rendering of a collection of polygons.

----
Rob Hetland, Associate Professor
Dept. of Oceanography, Texas A&M University
http://pong.tamu.edu/~rob
phone: 979-458-0096, fax: 979-845-6331

Paul Kienzle wrote:

Second, much of what I do involves plotting model data (on a curvilinear grid). I generally like to use pcolor for these plots. I *always* want shading='flat' Some of my grids are large, and I only see lines if I don't. Even with smaller grids, those black lines get in the way. I don't want to suggest an RC setting for everything, but this one single setting would save me thousands of characters typed per week. Can we add an RC shading option?

If your data is on a quadrilateral mesh, try using the pcolormesh
function. It is orders of magnitude faster than pcolor and we
solved the black lines problem by using transparency on the mesh
grid (though of course you can use 'flat' if you want). We only
implemented this for the Agg backend, otherwise it falls back to
the pcolor style rendering of a collection of polygons.

Paul,

Quadmesh has a bug in it that I would love to see squashed. Can you look at it, or induce someone else to do so? I tried but couldn't figure it out--it is something deep in the use of Agg. It is illustrated by examples/quadmesh_demo.py. With masked data (right-hand subplot), the masked region is not set to the background but is instead picking up odd things. If you don't see it immediately, try reshaping and resizing the plot a few times.

Thanks.

Eric

···

On Fri, Jul 20, 2007 at 08:53:30AM -0400, Rob Hetland wrote:

  - Paul

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Rob Hetland wrote:

Second, much of what I do involves plotting model data (on a
curvilinear grid). I generally like to use pcolor for these plots.
I *always* want shading='flat' Some of my grids are large, and I
only see lines if I don't. Even with smaller grids, those black
lines get in the way. I don't want to suggest an RC setting for
everything, but this one single setting would save me thousands of
characters typed per week. Can we add an RC shading option?

If your data is on a quadrilateral mesh, try using the pcolormesh
function. It is orders of magnitude faster than pcolor and we
solved the black lines problem by using transparency on the mesh
grid (though of course you can use 'flat' if you want). We only
implemented this for the Agg backend, otherwise it falls back to
the pcolor style rendering of a collection of polygons.

Yes, pcolormesh works great. Still, when I use the default values [pcolormesh(x, y, z)] I get a Morrey (sp?) pattern instead of seeing the grid -- i.e., better than pcolor(..., shading='faceted'), but still not a great plot. Is it possible to set RC defaults to get the equivalent of shading='flat' in pcolormesh? As far as I know, it is not possible in pcolor.

Rob,

That horrible default of 'faceted' is an evil side-effect of patterning pylab after matlab; it is ugly and annoying in matlab, and equally so in pylab. We can either break the matlab compatibility or put in an rc setting--but I agree, one or the other is needed, and should apply in the same way to pcolor as to pcolormesh. The path of least resistance is yet another rc setting, but it might be worth a question to matplotlib-users to see if *anyone* really likes keeping the Matlab-style default. Probably there are such people.

Eric

···

On Jul 20, 2007, at 9:07 AM, Paul Kienzle wrote:

On Fri, Jul 20, 2007 at 08:53:30AM -0400, Rob Hetland wrote:

-r

----
Rob Hetland, Associate Professor
Dept. of Oceanography, Texas A&M University
http://pong.tamu.edu/~rob
phone: 979-458-0096, fax: 979-845-6331

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This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2005.
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Matplotlib-devel@lists.sourceforge.net
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