[PyX-devel] [ pyx-Bugs-977323 ] rater.py: division by Zero

[SourceForge.net <no...@so...>]

Bugs item #977323, was opened at 2004-06-22 11:25
Message generated for change (Comment added) made by wobsta
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=442886&aid=977323&group_id=45430

Category: None
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Marko Vendelin (tmp001)
Assigned to: André Wobst (wobsta)
Summary: rater.py: division by Zero

Initial Comment:
I would like to report a bug (or rather strange feature
:) ) in
pyx/graph/axis/rater.py. If I specify limits of axis
equal to [12.5 to 1050] then pyx crashes somewhere in
rater.py:

------
Example program:

from pyx import *

g = graph.graphxy(height=8, width=8,
                  x=graph.axis.linear(min=12.5,
max=1050, title=r"\large{X}"),
                  y=graph.axis.linear(title=r"\large{Y}") )

g.plot( graph.data.list( [[0, 50], [10, 50]],
addlinenumbers=0, x=0, y=1),
   
graph.style.line(lineattrs=[style.linewidth.thick,style.linecap.round])
)

g.writetofile("test.eps")

-------
Output:

Traceback (most recent call last):
  File "test.py", line 10, in ?
    g.writetofile("test.eps")
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/canvas.py",
line 533,
in writetofile
    self.writeEPSfile(filename, *args, **kwargs)
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/canvas.py",
line 367,
in writeEPSfile
    abbox = bbox is not None and bbox or self.bbox()
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/graph/graph.py",
line
418, in bbox
    self.finish()
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/graph/graph.py",
line
368, in finish
    self.domethods[0]()
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/graph/graph.py",
line
310, in dolayout
    axis.finish(self.axespos[key])
  File
"/home/markov/python/graphics/PyX-0.6.3/pyx/graph/axis/axis.py",
line 313, in finish
    newrate = self.rater.rateticks(self, newticks,
self.density)
  File "/home/markov/python/pyx/graph/axis/rater.py",
line 193, in
rateticks
    return rate/weight
ZeroDivisionError: integer division or modulo by zero

cheers,

Marko

----------------------------------------------------------------------

>Comment By: André Wobst (wobsta)
Date: 2004-06-29 17:37

Message:
Logged In: YES 
user_id=405853

Thanks for reporting this issue and sorry for my late response. The 
problem is, that a partitioner might return an empty list of ticks but was 
not considered in the code. This behaviour of the partitioner is also 
beyond to be changed. Its also interesting to see your example, where 
you step into that problem even for the default parameters of the 
automatic linear partitioner.

To solve the problem at least the axis need to take care of this special 
case. (While the axis must take care of it, the rater might not even be 
asked for such a case.) A patch is enclosed. Note, that you will get an 
error from the partitioner for the y axis in your example, but this is due 
to the y range from 50 to 50. I do not consider this later issue to be a 
bug.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=442886&aid=977323&group_id=45430