format error saving eps figure using custom linestyle #14996
Description
Bug report
Bug summary
When the linestyle is changed from a predefined value to on-off tuple, the resulting figure cannot be saved as eps file format.
Code for reproduction
import numpy as np
import matplotlib.pyplot as plt
x = y = np.linspace(-5, 5)
x, y = np.meshgrid(x, y)
z = x**2 + y**2 - 10
plt.rcParams['contour.negative_linestyle'] = [7.0, 7.0]
f = plt.figure()
plt.contour(x, y, z, colors='k', levels=20)
f.savefig('test.eps')Actual outcome
Traceback (most recent call last):
File "<ipython-input-12-d73b5c362b1b>", line 1, in <module>
f.savefig('test.eps')
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\figure.py", line 2180, in savefig
self.canvas.print_figure(fname, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_qt5agg.py", line 88, in print_figure
super().print_figure(*args, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backend_bases.py", line 2082, in print_figure
**kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 842, in print_eps
return self._print_ps(outfile, 'eps', *args, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 871, in _print_ps
**kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 966, in _print_figure
self.figure.draw(renderer)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\figure.py", line 1709, in draw
renderer, self, artists, self.suppressComposite)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
a.draw(renderer)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\axes\_base.py", line 2647, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images
a.draw(renderer)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\collections.py", line 329, in draw
self._offset_position)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 492, in draw_path_collection
offset_position)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backend_bases.py", line 245, in draw_path_collection
self.draw_path(gc0, path, transform, rgbFace)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 414, in draw_path
self._draw_ps(ps, gc, rgbFace)
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 759, in _draw_ps
self.set_linedash(*gc.get_dashes())
File "C:\Users\mhossein\Anaconda3\lib\site-packages\matplotlib\backends\backend_ps.py", line 276, in set_linedash
s = "[%s] %d setdash\n" % (_nums_to_str(*seq), offset)
TypeError: %d format: a number is required, not NoneType
Expected outcome
The above snippet works when png extension is used, or when [7.0, 7.0] is replaced with 'dashed'
Matplotlib version
- Operating system: windows 7.0
- Matplotlib version: 3.1.1
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.7.1
- Jupyter version (if applicable):
- Other libraries: