Included below is an updated patch fixing the legend with numpoints=1.
The patch has been made against SVN and works for Line2D,
LineCollection, Patch, and RegularPolyCollection. The patch could be merged.
I also think the patch could be improved. Currently, handle._marker is
examined to determine if the legend should contain lines or symbols, but
this is done in the _get_handles function. It would be better if that
could be moved into the Legend class definition, however, I do not know
how to examine handle._marker in the Legend class definition.
Again, I would appreciate any comments or improvements.
Thanks,
Paul
diff -u a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
--- a/lib/matplotlib/legend.py 2008-01-09 13:11:00.000000000 -0600
+++ b/lib/matplotlib/legend.py 2008-01-09 13:08:36.000000000 -0600
@@ -175,9 +175,7 @@
# make a trial box in the middle of the axes. relocate it
# based on it's bbox
left, top = 0.5, 0.5
- if self.numpoints == 1:
- self._xdata = npy.array([left + self.handlelen*0.5])
- else:
+ if self.numpoints > 1:
self._xdata = npy.linspace(left, left + self.handlelen,
self.numpoints)
textleft = left+ self.handlelen+self.handletextsep
self.texts = self._get_texts(labels, textleft, top)
@@ -236,6 +234,7 @@
def _get_handles(self, handles, texts):
HEIGHT = self._approx_text_height()
+ left = 0.5
ret = [] # the returned legend lines
@@ -243,6 +242,10 @@
x, y = label.get_position()
x -= self.handlelen + self.handletextsep
if isinstance(handle, Line2D):
+ if self.numpoints == 1 and handle._marker == 'None':
+ self._xdata = npy.linspace(left, left +
self.handlelen, 2)
+ elif self.numpoints == 1:
+ self._xdata = npy.array([left + self.handlelen*0.5])
ydata = (y-HEIGHT/2)*npy.ones(self._xdata.shape, float)
legline = Line2D(self._xdata, ydata)
legline.update_from(handle)
@@ -253,7 +256,8 @@
ret.append(legline)
elif isinstance(handle, Patch):
-
+ if self.numpoints == 1:
+ self._xdata = npy.linspace(left, left +
self.handlelen, 2)
p = Rectangle(xy=(min(self._xdata), y-3/4*HEIGHT),
width = self.handlelen, height=HEIGHT/2,
)
@@ -263,6 +267,8 @@
p.set_clip_path(None)
ret.append(p)
elif isinstance(handle, LineCollection):
+ if self.numpoints == 1:
+ self._xdata = npy.linspace(left, left +
self.handlelen, 2)
ydata = (y-HEIGHT/2)*npy.ones(self._xdata.shape, float)
legline = Line2D(self._xdata, ydata)
self._set_artist_props(legline)
@@ -277,6 +283,8 @@
ret.append(legline)
elif isinstance(handle, RegularPolyCollection):
+ if self.numpoints == 1:
+ self._xdata = npy.array([left])
p = Rectangle(xy=(min(self._xdata), y-3/4*HEIGHT),
width = self.handlelen, height=HEIGHT/2,
)
Michael Droettboom wrote:
> I'm sure the radio silence to your question is just due to holidays.
>
> Thanks for looking into this. I'd be happy to incorporate your patch
> when it is ready.
>
> As for your question about plots that can include patches -- patches are
> virtually anything plotted that aren't lines or images. This includes
> rectangles, polygons and ellipses, for instance. See something like
> ellipse_demo.py for an example. Patches are always drawn as rectangles
> in the legend.
>
> Cheers,
> Mike
>
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