I seem to be getting some corner artifacts when using *Agg that I
haven't seen before. Anyone else seeing something strange and any
idea why?
import numpy
from pylab import figure, show
t = numpy.arange(0.0, 1.0, 0.1)
s = numpy.ones(len(t), dtype=numpy.float_)
s[1::2] = 0.
fig = figure()
ax = fig.add_subplot(111)
ax.plot(t, s, '-', lw=2)
ax.set_ylim(-.5, 1.5)
show()
Works for me, python 2.4, matplotlib 0.90.0, .matplotlibrc:
numerix: numpy
backend: GTKAgg
even with lw=20
John Hunter wrote:
I seem to be getting some corner artifacts when using *Agg that I
haven't seen before. Anyone else seeing something strange and any
idea why?import numpy
from pylab import figure, show
t = numpy.arange(0.0, 1.0, 0.1)
s = numpy.ones(len(t), dtype=numpy.float_)
s[1::2] = 0.fig = figure()
ax = fig.add_subplot(111)
ax.plot(t, s, '-', lw=2)
ax.set_ylim(-.5, 1.5)
show()
--
Tom Holroyd, Ph.D.
"The fundamentally misconceived nature versus nurture debate should be
abandoned: child development is inextricably both." -- Louann Brizendine
I started seeing them with the QtAgg backend when I updated the svn
version I was using. That was about 2 weeks ago, and the previous
version was about 6 weeks old, at that point.
Glen
On Wed, May 23, 2007 at 03:15:45PM -0500, John Hunter wrote:
I seem to be getting some corner artifacts when using *Agg that I
haven't seen before. Anyone else seeing something strange and any
idea why?
John Hunter wrote:
I seem to be getting some corner artifacts when using *Agg that I
haven't seen before. Anyone else seeing something strange and any
idea why?import numpy
from pylab import figure, show
t = numpy.arange(0.0, 1.0, 0.1)
s = numpy.ones(len(t), dtype=numpy.float_)
s[1::2] = 0.fig = figure()
ax = fig.add_subplot(111)
ax.plot(t, s, '-', lw=2)
ax.set_ylim(-.5, 1.5)
show()
Confirmed with GTKAgg on OS X, latest svn (but not with 0.90). No idea why though.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
NOAA/OAR/PSD R/PSD1 Email : [email protected]...
325 Broadway Office : Skaggs Research Cntr 1D-124
Boulder, CO, USA 80303-3328 Web : Jeffrey S. Whitaker: NOAA Physical Sciences Laboratory
Glad you wrote this, I was about to. I noticed them only recently,
and they're driving me nuts. They aren't just corners, they have to
do with the overlap of two lines and Agg messing something up when
thick lines overlap.
Here's an example that illustrates it more easily (that's how I ran into it):
import numpy as N
from pylab import figure, show
t = N.linspace(-1.0, 1.0, 2001)
s = N.exp(-300*N.abs(t))
fig = figure()
ax = fig.add_subplot(111)
ax.plot(t, s, '-', lw=2)
show()
On 5/23/07, John Hunter <[email protected]...> wrote:
I seem to be getting some corner artifacts when using *Agg that I
haven't seen before. Anyone else seeing something strange and any
idea why?
###
Plot this, then click on the little zoom tool (the cross) and do a
horizontal right-mouse motion to widen/tighten the exponential.
You'll see the white artifact move across the region of overlap of the
vertical lines.
Fortunately for me, the generated EPS don't have the problem (it's a
pure Agg bug), so I'm OK for the final output. But it's really
annoying on screen. My plots have tons of nearly retracing lines on
them, and they look atrociously bad now.
Cheers,
f
Fortunately for me, the generated EPS don't have the problem (it's a
pure Agg bug), so I'm OK for the final output. But it's really
annoying on screen. My plots have tons of nearly retracing lines on
them, and they look atrociously bad now.
Apparently I broke something when I added the support for general
polygon clipping to agg. Unfortunately, this code was pretty hairy so
it will take me a little time to fix. Those of you who are annoyed by
this should simply revert your local copy to
> svn up src/_backend_agg.h -r3254
> svn up src/_backend_agg.cpp -r3254
and hopefully I can find and fix the problem in the main line ASAP.
JDH
On 5/23/07, Fernando Perez <[email protected]...> wrote:
Oops, make that revision 3092
On 5/24/07, John Hunter <[email protected]...> wrote:
> svn up src/_backend_agg.h -r3254
> svn up src/_backend_agg.cpp -r3254
OK, just ignore me 
It turned out to be an easy fix. I was experimenting with even-odd
and non-zero filling rules when I was working on polygon clipping and
left a setting turned on that I did not mean to. Problem fixed in
svn.
JDH
On 5/24/07, John Hunter <[email protected]...> wrote:
On 5/24/07, John Hunter <[email protected]...> wrote:
> > svn up src/_backend_agg.h -r3254
> > svn up src/_backend_agg.cpp -r3254Oops, make that revision 3092
Great, thanks. Works perfectly now.
Cheers,
f
On 5/24/07, John Hunter <[email protected]...> wrote:
It turned out to be an easy fix. I was experimenting with even-odd
and non-zero filling rules when I was working on polygon clipping and
left a setting turned on that I did not mean to. Problem fixed in
svn.
