matplotlib-users

[Matplotlib-users] open circles aren't showing up in the legend box

[Joe L. <jgl...@gm...>]

Using matplotlib.pyplot I create a scatter plot using two symbols, an open
circle, and a filled circle.  The legend for this plot shows both labels,
but there is no symbol for the open circles (see
missing_legend_circles.png).  Switching to matplotlib.pylab yields the same
result.  However, from an "ipython --pylab" session the open circles are
displayed in the legend.  This has me more baffled than usual.  Here's the
code to reproduce the enclosed figure:

import matplotlib.pyplot as plt

fig = plt.figure()
plot = fig.add_subplot(111)

plot.scatter([1, 2, 3], [4, 5, 6], c = [0.2, 0.4, 0.6], label = 'one',
     cmap = 'jet', marker = 'o', edgecolor = 'face')

plot.scatter([1, 2, 3], [7, 6, 5], c = [0.2, 0.4, 0.6], label = 'two',
              cmap = 'jet', marker = 'o', edgecolor = 'face',
      facecolor = 'none')
plot.legend()
plt.show()


This is with matplotlib 1.1 and 1.2 on Windows 7 with the TkAgg, WxAgg and
WX backends.

Thank you for any help.

-- Joe Louderback

Re: [Matplotlib-users] open circles aren't showing up in the legend box

[Paul H. <pmh...@gm...>]

On Wed, Jan 2, 2013 at 4:46 PM, Joe Louderback <jgl...@gm...>wrote:

> import matplotlib.pyplot as plt
>
> fig = plt.figure()
> plot = fig.add_subplot(111)
>
> plot.scatter([1, 2, 3], [4, 5, 6], c = [0.2, 0.4, 0.6], label = 'one',
>      cmap = 'jet', marker = 'o', edgecolor = 'face')
>
> plot.scatter([1, 2, 3], [7, 6, 5], c = [0.2, 0.4, 0.6], label = 'two',
>               cmap = 'jet', marker = 'o', edgecolor = 'face',
>       facecolor = 'none')
> plot.legend()
> plt.show()
>

I'm not quite sure what /should/ happen when you set the `facecolor` to
'none' and the `edgecolor` to 'face'. I'm surprised anything shows up at
the axes at all. But if you remove the `edgecolor` kwarg things look better:

import matplotlib.pyplot as plt
fig = plt.figure()
plot = fig.add_subplot(111)
plot.scatter([1, 2, 3], [4, 5, 6], c = [0.2, 0.4, 0.6], label = 'one',
     cmap = 'jet', marker = 'o', edgecolor = 'face')

plot.scatter([1, 2, 3], [7, 6, 5], c = [0.2, 0.4, 0.6], label = 'two',
              cmap = 'jet', marker = 'o', facecolor='none')
plot.legend()
plt.show()

Re: [Matplotlib-users] open circles aren't showing up in the legend box

[ChaoYue <cha...@gm...>]

I doubt there is a color called 'face',  according to documentation:

In [2]: setp(mat.collections.PathCollection,'edgecolor')
  edgecolor: matplotlib color arg or sequence of rgba tuples     

probably because matplotlib doesn't know how rend the color 'face'?

Chao



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Re: [Matplotlib-users] open circles aren't showing up in the legend box

[Jonathan S. <js...@cf...>]

Joe,

I think the problem is the edgecolor='face' in the scatter call for the
open circles.  For me when I omit that, it all works.  I'd also note
that calling legend after draw results in the legend showing the circles
correctly colored.

Regards,
Jon

On Wed, 2013-01-02 at 16:46 -0800, Joe Louderback wrote:
> Using matplotlib.pyplot I create a scatter plot using two symbols, an
> open circle, and a filled circle.  The legend for this plot shows both
> labels, but there is no symbol for the open circles (see
> missing_legend_circles.png).  Switching to matplotlib.pylab yields the
> same result.  However, from an "ipython --pylab" session the open
> circles are displayed in the legend.  This has me more baffled than
> usual.  Here's the code to reproduce the enclosed figure:
> 
> import matplotlib.pyplot as plt
> 
> 
> fig = plt.figure()
> plot = fig.add_subplot(111)
> 
> 
> plot.scatter([1, 2, 3], [4, 5, 6], c = [0.2, 0.4, 0.6], label =
> 'one', 
>     cmap = 'jet', marker = 'o', edgecolor = 'face') 
> 
> 
> plot.scatter([1, 2, 3], [7, 6, 5], c = [0.2, 0.4, 0.6], label = 'two',
>               cmap = 'jet', marker = 'o', edgecolor = 'face', 
>      facecolor = 'none')
> plot.legend()
> plt.show()
> 
> 
> 
> 
> This is with matplotlib 1.1 and 1.2 on Windows 7 with the TkAgg, WxAgg
> and WX backends.
> 
> 
> Thank you for any help.
> 
> 
> -- Joe Louderback

-- 
______________________________________________________________
Jonathan D. Slavin              Harvard-Smithsonian CfA
js...@cf...         60 Garden Street, MS 83
phone: (617) 496-7981           Cambridge, MA 02138-1516
 cell: (781) 363-0035           USA
______________________________________________________________

Re: [Matplotlib-users] open circles aren't showing up in the legend box

[Joe L. <jgl...@gm...>]

Thank you everyone for your answers.  My legend is no longer defaced since
I de-faced the call to scatter() :-)