legend won't work with dashed lines

Community matplotlib-users
1

Hi all,

I'm wirking on a wxpython app, and I realized that the legend of a
matplotlib plot only works with solid lines. If I change the
linestyles to dashed, dotted or dashdot, it gives an error:

Traceback (most recent call last):
  File "/home/guano/Arbeit/Stout/StereoPanel.py", line 551, in PlotChecked
    self.stereoCanvas.draw()
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_wxagg.py",
line 59, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
line 314, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 774, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/axes.py", line 1721, in draw
    a.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/legend.py", line 386, in draw
    self._legend_box.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 488, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 535, in draw
    drawFunc(renderer, gc, tpath, affine.frozen())
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 874,
in _draw_lines
    self._lineFunc(renderer, gc, path, trans)
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 925,
in _draw_dashed
    renderer.draw_path(gc, path, trans)
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
line 98, in draw_path
    self._renderer.draw_path(gc, path, transform, rgbFace)
TypeError: float() argument must be a string or a number

This happens for Line2D and for LineCollection as well.

TIA

Carlos

···

--
Prof. Carlos Henrique Grohmann - Geologist D.Sc.
Institute of Geosciences - Univ. of São Paulo, Brazil
http://www.igc.usp.br/pessoais/guano
Linux User #89721
________________
Can’t stop the signal.

2

The following works for me.

   from pylab import *

   plot([1,2,3], linestyle='dashed', label='foo')
   legend()
   show()

Can you be more specific about how you create the error?

Mike

Carlos Grohmann wrote:

···

Hi all,

I'm wirking on a wxpython app, and I realized that the legend of a
matplotlib plot only works with solid lines. If I change the
linestyles to dashed, dotted or dashdot, it gives an error:

Traceback (most recent call last):
  File "/home/guano/Arbeit/Stout/StereoPanel.py", line 551, in PlotChecked
    self.stereoCanvas.draw()
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_wxagg.py",
line 59, in draw
    FigureCanvasAgg.draw(self)
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
line 314, in draw
    self.figure.draw(self.renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/figure.py", line 774, in draw
    for a in self.axes: a.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/axes.py", line 1721, in draw
    a.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/legend.py", line 386, in draw
    self._legend_box.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 224, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/offsetbox.py", line 488, in draw
    c.draw(renderer)
  File "/usr/lib/pymodules/python2.6/matplotlib/artist.py", line 46,
in draw_wrapper
    draw(artist, renderer, *kl)
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 535, in draw
    drawFunc(renderer, gc, tpath, affine.frozen())
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 874,
in _draw_lines
    self._lineFunc(renderer, gc, path, trans)
  File "/usr/lib/pymodules/python2.6/matplotlib/lines.py", line 925,
in _draw_dashed
    renderer.draw_path(gc, path, trans)
  File "/usr/lib/pymodules/python2.6/matplotlib/backends/backend_agg.py",
line 98, in draw_path
    self._renderer.draw_path(gc, path, transform, rgbFace)
TypeError: float() argument must be a string or a number

This happens for Line2D and for LineCollection as well.

TIA

Carlos

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