Hi, When drawing a patch, the alpha value of its edgeolor is ignored. The following command draw a circle whose edgecolor has alpha=1, instead of 0.1.
gca().add_patch(Circle((0.5, 0.5), 0.3,
ec=(1,0,0,0.1), fc="none"))
Attached is a little test script and its output.
It seems that the edgecolor always has an alpha value of the face color.
I'm not sure if this behavior is intended, but I personally think this
is a bug.
Regards,
-JJ
import matplotlib.pyplot as plt
from matplotlib.patches import Circle
#plot([1,2], alpha=0.1)
plt.clf()
plt.text(0.2, 0.6, "(a)\nec=1,0,0,0.1\nfc=none\nalpha=1",
bbox=dict(ec=(1,0,0,0.1),
fc="none",
alpha=1.,
lw=5),)
plt.text(0.2, 0.4, "(b)\nec=1,0,0,1\nfc=none\nalpha=0.1",
bbox=dict(ec=(1,0,0,1),
fc="none",
alpha=0.1,
lw=5),)
plt.text(0.2, 0.2, "(c)\nec=1,0,0,0.1\nfc=none\nalpha=0.1",
bbox=dict(ec=(1,0,0,0.1),
fc="none",
alpha=0.1,
lw=5),)
plt.text(0.6, 0.6, "(d)\nec=1,0,0,0.1\nfc=1,0,0,1\nalpha=1",
bbox=dict(ec=(1,0,0,0.1),
fc=(1,0,0,1),
alpha=1,
lw=5),)
plt.text(0.6, 0.4, "(e)\nec=1,0,0,1\nfc=1,0,0,0.1\nalpha=0.1",
bbox=dict(ec=(1,0,0,1),
fc=(1,0,0,0.1),
alpha=1,
lw=5),)
plt.text(0.6, 0.2, "(f)\nec=1,0,0,1\nfc=1,0,0,0.1\nalpha=0.1",
bbox=dict(ec=(1,0,0,1),
fc=(1,0,0,0.1),
alpha=0.1,
lw=5),)
plt.savefig("path-alpha_test.png")
plt.savefig("path-alpha_test.pdf")
plt.show()
<<attachment: path-alpha_test.png>>
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