Hi all!
I'm using version 0.91.2, but by looking at the svn repository is seems
this issue still exists.
There seems to be a bug in the getpoints() method in the YAArrow class.
When I execute the commands
from pylab import *
annotate('Oops...', (.2, .2), (.2, .6), arrowprops=dict(width=3))
show()
(note that the x2-x1==0) I get the error:
Traceback (most recent call last):
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
line 331, in expose_event
self._render_figure(self._pixmap, w, h)
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_agg.py",
line 358, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
624, in draw
for a in self.axes: a.draw(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line
1345, in draw
a.draw(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line
1246, in draw
self.update_positions(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line
1242, in update_positions
**d)
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
678, in __init__
verts = self.get_verts()
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
690, in get_verts
xb1, yb1, xb2, yb2 = self.getpoints(x1, y1, x2, y2, k1)
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
714, in getpoints
m = (y2-y1)/(x2-x1)
ZeroDivisionError: float division
Traceback (most recent call last):
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtk.py",
line 331, in expose_event
self._render_figure(self._pixmap, w, h)
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_gtkagg.py",
line 75, in _render_figure
FigureCanvasAgg.draw(self)
File
"/usr/lib/python2.5/site-packages/matplotlib/backends/backend_agg.py",
line 358, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/figure.py", line
624, in draw
for a in self.axes: a.draw(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line
1345, in draw
a.draw(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line
1246, in draw
self.update_positions(renderer)
File "/usr/lib/python2.5/site-packages/matplotlib/text.py", line
1242, in update_positions
**d)
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
678, in __init__
verts = self.get_verts()
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
690, in get_verts
xb1, yb1, xb2, yb2 = self.getpoints(x1, y1, x2, y2, k1)
File "/usr/lib/python2.5/site-packages/matplotlib/patches.py", line
714, in getpoints
m = (y2-y1)/(x2-x1)
ZeroDivisionError: float division
It seems that the function getpoints() doesn't take care of the
situations when the slope of the line (x1,y1,x2,y2) is zero or infinity.
This could be solved with the simple check in the function:
if y2-y1 == 0:
return x2, y2+k, x2, y2-k
elif x2-x1 == 0:
return x2+k, y2, x2-k, y2
This fixes it for me.
By the way, I just found out about matplotlib, and I find it extremely
useful! Thanks to all devs for creating this :).
Cheers,
Tuukka Verho
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