strange grid lines when panning

Community matplotlib-users
1

Hi everybody,

I encounter a strange behavior of TKAgg backend with Matplotlib 0.98.5 and
SVN versions, when panning: the grid lines do not always match the ticks on
the axes:

http://paratribulations.free.fr/help/pan_behavior/strange_lines_when_panning.png

Here is the corresponding script:

http://paratribulations.free.fr/help/pan_behavior/test.py

This problem does not appear with Matplotlib 0.91.2.
Do you reproduce the same strange grid lines with 0.98.5 and SVN version?
Try to pan the curve in all directions, it is rather easy to make this bug
appear.

Just another question: is it normal that on my computer TKAgg has more
antialiasing in 0.98.5 than in 0.91.2? Look at the same plot in 0.91.2
here:

http://paratribulations.free.fr/help/pan_behavior/less_antialiasing_in_0_91_2.png

Thanks

Julien

···

--
python -c "print ''.join([chr(154 - ord(c)) for c in '*9(9&(18%.\
9&1+,\'Z4(55l4('])"

"When a distinguished but elderly scientist states that something is
possible, he is almost certainly right. When he states that something is
impossible, he is very probably wrong." (first law of AC Clarke)

2

TP wrote:

Hi everybody,

I encounter a strange behavior of TKAgg backend with Matplotlib 0.98.5 and
SVN versions, when panning: the grid lines do not always match the ticks on
the axes:

http://paratribulations.free.fr/help/pan_behavior/strange_lines_when_panning.png

Here is the corresponding script:

http://paratribulations.free.fr/help/pan_behavior/test.py

This problem does not appear with Matplotlib 0.91.2.
Do you reproduce the same strange grid lines with 0.98.5 and SVN version?
Try to pan the curve in all directions, it is rather easy to make this bug
appear.
  

Thanks for this report. This is a very serious bug, that I suspect was introduced when trying to resolve a log-scale related transforms bug a while back. I'll have to look into this further.

Just another question: is it normal that on my computer TKAgg has more
antialiasing in 0.98.5 than in 0.91.2? Look at the same plot in 0.91.2
here:

http://paratribulations.free.fr/help/pan_behavior/less_antialiasing_in_0_91_2.png
  

Fixing the fuzzy axes rectangle was deliberate. The lighter grid lines was not. That is also a bug that will need to be fixed.

Mike

···

--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA

3

Michael Droettboom wrote:

TP wrote:
  

Hi everybody,

I encounter a strange behavior of TKAgg backend with Matplotlib 0.98.5 and
SVN versions, when panning: the grid lines do not always match the ticks on
the axes:

http://paratribulations.free.fr/help/pan_behavior/strange_lines_when_panning.png

Here is the corresponding script:

http://paratribulations.free.fr/help/pan_behavior/test.py

This problem does not appear with Matplotlib 0.91.2.
Do you reproduce the same strange grid lines with 0.98.5 and SVN version?
Try to pan the curve in all directions, it is rather easy to make this bug
appear.
  

Thanks for this report. This is a very serious bug, that I suspect was introduced when trying to resolve a log-scale related transforms bug a while back. I'll have to look into this further.
  

This has now been fixed in SVN r6608.

Just another question: is it normal that on my computer TKAgg has more
antialiasing in 0.98.5 than in 0.91.2? Look at the same plot in 0.91.2
here:

http://paratribulations.free.fr/help/pan_behavior/less_antialiasing_in_0_91_2.png
  

Fixing the fuzzy axes rectangle was deliberate. The lighter grid lines was not. That is also a bug that will need to be fixed.
  

This has also been fixed in SVN r6609.

Mike

···

--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA