Re: [Matplotlib-users] Discrete legend

[Jouni K . Seppänen]

"Jose Gomez-Dans" <[EMAIL PROTECTED]>
writes:

> I realise that the legend class has some support for patches, but how
> does one go about using them? I can't just add a legend (I get a very
> messy legend, one for every patch in my plot). 

Pass to the legend command a list of patches, and the legend will
only show those patches. Here's a quick example:

#!/usr/bin/env python
from numpy import *
from pylab import *
from matplotlib.patches import Polygon

square = array([[0.0, 0.0], [1.0, 0.0], [1.0, 1.0], [0.0, 1.0]])
reds=[]
for x,y in (0,0),(2,0),(1,1): reds.append(Polygon(square+(x,y), fc='red'))
blues = []
for x,y in (1,0),(0,1),(2,1): blues.append(Polygon(square+(x,y), fc='blue'))
for p in reds+blues: gca().add_patch(p)
axis((0,3,0,3))
legend([reds[0], blues[0]], ['foo', 'bar'])
show()

In the example there are six patches, but only two are passed to legend,
and those two are shown in the result.

-- 
Jouni K. Seppänen
http://www.iki.fi/jks
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[Matplotlib-users] Discrete legend

[Jose Gomez-Dans]

Hi,
I am plotting a number of polygons with different colours (results
from an image clustering or classification algorithm). I'd like to
have a map-like legend, with a square filled with some colour and some
text describing what it is (a quick search in Google comes up with the
following example:
. Scary,
though hopefully you get the gist of it :D).

I realise that the legend class has some support for patches, but how
does one go about using them? I can't just add a legend (I get a very
messy legend, one for every patch in my plot). I should be able to set
my legend somewhere, but I don't know where to start: pylab.legend?
matplotlib.legend?

Any hints or examples greatly appreciated!
J

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