Hi all,
I found a small bug in LineCollection, which gives an exception when setting
alpha. This is manifested in e.g. hlines and vlines:
In [1]: hlines((0,),(-1,),(1,),color='b',alpha=0.1)
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
XXX/<ipython console> in <module>()
XXX/lib/python/matplotlib/pyplot.py in hlines(*args, **kwargs)
1700 hold(h)
1701 try:
-> 1702 ret = gca().hlines(*args, **kwargs)
1703 draw_if_interactive()
1704 except:
XXX/lib/python/matplotlib/axes.py in hlines(self, y, xmin, xmax, colors,
linestyles, label, **kwargs)
2609 linestyles=linestyles,
label=label)
2610 self.add_collection(coll)
-> 2611 coll.update(kwargs)
2612
2613 minx = min(xmin.min(), xmax.min())
XXX/lib/python/matplotlib/artist.py in update(self, props)
438 if func is None or not callable(func):
439 raise AttributeError('Unknown property %s'%k)
--> 440 func(v)
441 changed = True
442 self.eventson = store
XXX/lib/python/matplotlib/collections.py in set_alpha(self, alpha)
306 else:
307 artist.Artist.set_alpha(self, alpha)
--> 308 self._facecolors[:, 3] = alpha
309 self._edgecolors[:, 3] = alpha
310
IndexError: invalid index
This appears to be because LineCollection.__init__() only uses
Collection._edgecolors, and sets _facecolors to an empty array. I don't
know if it's the proper solution, but I did this to get it to work:
Index: lib/matplotlib/collections.py
===================================================================
--- lib/matplotlib/collections.py (revision 5000)
+++ lib/matplotlib/collections.py (working copy)
@@ -305,7 +305,8 @@
except TypeError: raise TypeError('alpha must be a float')
else:
artist.Artist.set_alpha(self, alpha)
- self._facecolors[:, 3] = alpha
+ if len(self._facecolors):
+ self._facecolors[:, 3] = alpha
self._edgecolors[:, 3] = alpha
def get_linewidths(self):
Best,
Mike
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