Hi All,
I have been testing the latest svn matplotlib, which failed to produce
any visible data in some long-standing scripts of mine. 
Investigating further, my use of markersize=0.5 combined with the '.'
symbol and the Agg backend caused a complete disappearance of the
markers. I'm attaching example images from 0.93.3 and the most recent
SVN using the attached script.
I'd be happy to track this down, but I think this might be a no-brainer
for someone on the list.
-Andrew
mpl_markersize.py (745 Bytes)
This might be related to a change I made in the Agg backend to make the markers look better by rounding their coordinates to the nearest pixel. It certainly made the stock markers at a standard size look better, but I suspect as they get smaller, they are converging down to the same value, thus having a truly zero-sized marker.
I'm away from a machine with build tools at the moment, so can't confirm. Does the attached patch work for you?
Mike
Andrew Straw wrote:
_backend_agg_disappearing_markers.cpp.diff (733 Bytes)
路路路
John Hunter wrote:
On Sat, Nov 29, 2008 at 3:55 PM, Andrew Straw <strawman@...36...> wrote:
Hi All,
I have been testing the latest svn matplotlib, which failed to produce
any visible data in some long-standing scripts of mine. 
Investigating further, my use of markersize=0.5 combined with the '.'
symbol and the Agg backend caused a complete disappearance of the
markers. I'm attaching example images from 0.93.3 and the most recent
SVN using the attached script.
I'd be happy to track this down, but I think this might be a no-brainer
for someone on the list.
Is this agg only?
It doesn't happen with PS or SVG, so I'll say yes.
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Hi Mike,
That does fix the issue. Another thing I noticed that is fixed with your
patch: the '.' marks appear like '+' when drawn at a smallish size.
Thanks,
Andrew
Michael Droettboom wrote:
路路路
This might be related to a change I made in the Agg backend to make the
markers look better by rounding their coordinates to the nearest pixel.
It certainly made the stock markers at a standard size look better, but
I suspect as they get smaller, they are converging down to the same
value, thus having a truly zero-sized marker.
I'm away from a machine with build tools at the moment, so can't
confirm. Does the attached patch work for you?
Mike
Andrew Straw wrote:
John Hunter wrote:
On Sat, Nov 29, 2008 at 3:55 PM, Andrew Straw <strawman@...36...> >>> wrote:
Hi All,
I have been testing the latest svn matplotlib, which failed to produce
any visible data in some long-standing scripts of mine.
Investigating further, my use of markersize=0.5 combined with the '.'
symbol and the Agg backend caused a complete disappearance of the
markers. I'm attaching example images from 0.93.3 and the most recent
SVN using the attached script.
I'd be happy to track this down, but I think this might be a no-brainer
for someone on the list.
Is this agg only?
It doesn't happen with PS or SVG, so I'll say yes.
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Ok. I'll apply this fix to SVN. I'll have to go back and find a better way to do this later. Personally, I think the markers at normal to largish size (5+ pixels in diameter) look too fuzzy without the pixel quantizing.
Mike
Andrew Straw wrote:
路路路
Hi Mike,
That does fix the issue. Another thing I noticed that is fixed with your
patch: the '.' marks appear like '+' when drawn at a smallish size.
Thanks,
Andrew
Michael Droettboom wrote:
This might be related to a change I made in the Agg backend to make the
markers look better by rounding their coordinates to the nearest pixel. It certainly made the stock markers at a standard size look better, but
I suspect as they get smaller, they are converging down to the same
value, thus having a truly zero-sized marker.
I'm away from a machine with build tools at the moment, so can't
confirm. Does the attached patch work for you?
Mike
Andrew Straw wrote:
John Hunter wrote:
On Sat, Nov 29, 2008 at 3:55 PM, Andrew Straw <strawman@...36...> >>>> wrote:
Hi All,
I have been testing the latest svn matplotlib, which failed to produce
any visible data in some long-standing scripts of mine.
Investigating further, my use of markersize=0.5 combined with the '.'
symbol and the Agg backend caused a complete disappearance of the
markers. I'm attaching example images from 0.93.3 and the most recent
SVN using the attached script.
I'd be happy to track this down, but I think this might be a no-brainer
for someone on the list.
Is this agg only?
It doesn't happen with PS or SVG, so I'll say yes.
-------------------------------------------------------------------------
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challenge
Build the coolest Linux based applications with Moblin SDK & win great
prizes
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world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
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--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA