Re: [Matplotlib-users] trace a rectangle

[Humufr <hu...@ya...>]

             Hi,
 so I found some answer to the second problem, to draw a rectangle at a 
certain place you add to define  the limit for gca instance, by default 
the limit of the figure are not use:

from pylab import *
from matplotlib.patches import Rectangle
ax = gca()
set(gca(),'xlim',[0,10],'ylim',[0,10])
p = Rectangle((1,1),3,3,fill=False)
ax.add_patch(p)

or more pythonic:

from pylab import *
from matplotlib.patches import Rectangle
ax = gca()
ax.set_xlim([0,10])
ax.set_ylim([0,10])
p = Rectangle((1,1),3,3,fill=False)
ax.add_patch(p)


but if you use axis only without redefine gca limit that don't work:

from pylab import *
from matplotlib.patches import Rectangle
axis([0,10],[0,10])
ax = gca()
p = Rectangle((1,1),3,3,fill=False)
ax.add_patch(p)

I understand that gca return an instance but perhaps that will be a good 
idea if by default that will use the axis of the courrant figure and not 
[0,1,0,1].

Thanks,

          Nicolas

Humufr wrote:

>             Hi,
>
> I have a problem to draw a rectangle:
>
> The first is that I can't arrive to draw a rectangle with ipython 
> -pylab, the script who work when it's launch independantly is not 
> working interactively. The rectangle is not draw. Perhaps it's normal 
> but I don't think.
>
> The second problem I have is to draw a rectangle at a certain position 
> with certain height and width. It's seems (at least when I tried to 
> use it) that the position must be done relatively at the window and 
> not from the plot. It's not very convenient because if I have a plot 
> draw between 1 and 100 in x and y, to draw the rectangle I add to use 
> something between 0 and 1 so I had to rescale the rectangle.
>
> Thanks,
>
>    Nicolas