[Matplotlib-users] Lines and columns in legends

[Vasileios K. <bko...@gm...>]

Jae-Joon hi,

  I am a newbie with matplolib.  I need a horizontal legend because my
figures are pretty wide and I need to automate the process of generating it.


Since matplotlib does not support horizontal legends I am hacking around it.


I modified your example below. So the following works:


from matplotlib.pylab import *
from matplotlib.legend import Legend
from matplotlib.patches import Rectangle

#fig = figure()
ax = gca()
pl_list = []
for i in range(10):
    pl, = ax.plot(random(10))
    pl_list.append(pl)

xleg,yleg= 0.5,0.5

l1 = Legend(ax, pl_list[0:1], "0", loc=1)
hg1, wd1 = l1.get_frame().get_height(), l1.get_frame().get_width()
l2 = Legend(ax, pl_list[1:2], "1", loc=1)
hg2, wd2 = l2.get_frame().get_height(), l2.get_frame().get_width()
l3 = Legend(ax, pl_list[2:3], "2", loc=1)
hg3, wd3 = l3.get_frame().get_height(), l3.get_frame().get_width()
l4 = Legend(ax, pl_list[3:4], "3", loc=1)
hg4, wd4 = l4.get_frame().get_height(), l4.get_frame().get_width()

total_height = hg1
total_width = wd1+wd2+wd3+wd4

print total_height, total_width

l1 = Legend(ax, pl_list[0:1], "0", loc=(xleg, yleg))
l2 = Legend(ax, pl_list[1:2], "1", loc=(xleg+wd1/5, yleg))
l3 = Legend(ax, pl_list[2:3], "2", loc=(xleg+(wd1+wd2)/5, yleg))
l4 = Legend(ax, pl_list[3:4], "3", loc=(xleg+(wd1+wd2+wd3)/5, yleg))
l1.get_frame().set_visible(False) # make background frame of legends
invisible
l2.get_frame().set_visible(False)
l3.get_frame().set_visible(False)
l4.get_frame().set_visible(False)

# make a large background frame
rect = Rectangle((xleg, yleg), 0.45, 0.05, # adjust these values (in
normalized axes coordinate)
                 fc="w", ec="k",
                 transform=ax.transAxes, zorder=4)
ax.add_artist(rect)
ax.add_artist(l1)
ax.add_artist(l2)
ax.add_artist(l3)
ax.add_artist(l4)


The basic idea is to create a legend with the line and label I need and then
use its dimensions to create the background frame.

The problem is that the height and width I get are in different units that
the normalized axes coordinates and I do not know how

to properly transfrom them which leads to the hacky  /5   , otherwise the
legends are off the figure.

Any suggestions on how I can automate this part?

Thanks in advance.



Jae-Joon Lee
Thu, 09 Oct 2008 12:21:56 -0700

Although I think it is possible to calculate the bounding box of the
all legends automatically,
Here is a manual way.


from matplotlib.patches import Rectangle

l1.get_frame().set_visible(False) # make background frame of legends invisible
l2.get_frame().set_visible(False)

# make a large background frame
rect = Rectangle((0.05, 0.75), 0.3, 0.2, # adjust these values (in
normalized axes coordinate)
                 fc="w", ec="k",
                 transform=ax.transAxes, zorder=4)
ax.add_artist(rect)

I hope this help,

-JJ




On Thu, Oct 9, 2008 at 2:43 PM, José Alexandre Nalon <[EMAIL PROTECTED]> wrote:
> Hello,
>
> Em Thursday 09 October 2008 13:46:52 Jae-Joon Lee escreveu:
>> Meanwhile, you may try to make multiple legends as a posible workarounds.
>
> Thanks for your answer. That did the trick, and the figure
> looks more or less as I wanted. It would look exactly as I
> wanted if I could remove the border from the legends and
> draw a box around the legends. How could I do that?
>
> (I apologize if this seems trivial. I use matplotlib a lot,
> but standard functions always seem to do what I need, so I
> don't go deep in its behaviour).
>
> --
> José Alexandre Nalon
> [EMAIL PROTECTED]
>
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