fill_between() no longer works with border linewidth of 0

[rabryan]

In 1.4.2, fill_between() does not always work when passing in lw=0 (to remove the border from the fill).

To reproduce, edit examples/pylab_examples/fill_between_demo.py and add argument "lw=0" in the first fill_between() call. Run the demo and notice how the fill no longer appears (in previous matplotlib versions it would appear -- but with no border).

[tacaswell]

Can you try this on either the 1.4.x branch or the master branch?

Can you provide a minimal working example?

[rabryan]

The behavior is the same on the master branch. Obviously its not a big deal since you can just set the linewidth to a very small value and it behaves almost identically to setting linewidth to 0.

Here is a small example:

#!/usr/bin/env python
import matplotlib.pyplot as plt
import numpy as np
from matplotlib.lines import Line2D

x = np.arange(0.0, 2, 0.01)
y1 = np.sin(2*np.pi*x)
y2 = 1.2*np.sin(4*np.pi*x)

fig, (ax1, ax2, ax3) = plt.subplots(3, 1, sharex=True)

ax1.fill_between(x, y1, y2, alpha = 0.2, lw=5)
ax1.set_ylabel('lw=5')

ax2.fill_between(x, y1, y2, alpha = 0.2, lw=0.01)
ax2.set_ylabel('lw=0.01')

ax3.fill_between(x, y1, y2, alpha = 0.2, lw=0)
ax3.set_ylabel('lw=0 (should still show fill)')
ax3.set_xlabel('x')
ax3.axes.add_line(Line2D(x, y1))

plt.show()

[tacaswell]

I can not confirm this, the output looks correct to me on the master branch and the current 1.4.x brach (tweaked the code a bit to use plot instead of creating the artist by hand).

import matplotlib.pyplot as plt
import numpy as np


x = np.arange(0.0, 2, 0.01)
y1 = np.sin(2*np.pi*x)
y2 = 1.2*np.sin(4*np.pi*x)

fig, (ax1, ax2, ax3) = plt.subplots(3, 1, sharex=True)

ax1.fill_between(x, y1, y2, alpha = 0.2, lw=5)
ax1.set_ylabel('lw=5')

ax2.fill_between(x, y1, y2, alpha = 0.2, lw=0.01)
ax2.set_ylabel('lw=0.01')

ax3.fill_between(x, y1, y2, alpha = 0.2, lw=0)
ax3.set_ylabel('lw=0 (should still show fill)')
ax3.set_xlabel('x')
ax3.plot(x, y1, linestyle='--', color='k')

plt.show()

[atpage]

This is broken for me as well. fill_between() with linewidth=0 was working in 1.4.0, but now in 1.4.2 it results in not plotting anything. Even trying to add a legend says that there were no labeled objects found. @tacaswell when I run your example, ax3 shows only the dashed line.

[mdboom]

This has been fixed in 1.4.3

[atpage]

Great, thanks.

[kaigaox]

Great!