On Wed, Feb 18, 2009 at 1:13 PM, Nicholas Stephens <
nicholas.steph...@univ-brest.fr> wrote:
> Hi all,
>
> I am creating what I would call a simple plot and up until now i have
> had no complaints. What I need is the ability to place a realtively
> small horizontal rectangle on the x-axis having never previously used
> the patches lib's. 8 hours and a slight sense of humour faliure later
> I am here. I have tried a number of methods now so i am convinced that
> there is a problem with my matplotlib setup or I am doing something
> incredably stupid, which I understand from previous experience is the
> more likely option :-)
>
> The problem is that I am also getting no output with simpler examples
> I am creating either. So the question is: I would like to add a simple
> rectangular box (12,0.01) on a plot similar to that shown below (I
> have used an example from ipython as I was trying to simplify things),
> so how would somebody else add a rectangular patch?
>
>
>
>
> from pylab import *
> from matplotlib.patches import Rectangle
>
> a=load('NC_figure4.dat', skiprows=(1))
> b=load('mean_NC_figure4.dat', skiprows=(1))
>
> ax=a[:,0]
> bx=b[:,0]
> # ay1=N:C
> ay1=a[:,1]
> # ay2=average N:C
> by1=b[:,1]
> # by1=N:C
> ay2=a[:,2]
> # by2=average N:C
> by2=b[:,2]
> # cy=difference
> cy=b[:,3]
>
> xx1 = subplot(111)
> t = arange(0.01, 10.0, 0.01)
> scatter(ax, ay1, s=10, c='k', marker='o')
> scatter(ax, ay2, s=10, c='b', marker='^')
> plot (bx,by1,'k-',markersize=8)
> plot (bx,by2,'b-',markersize=8)
> plot (bx,cy,'r-',markersize=8)
> xlim(-2,48)
> ylim(0,0.22)
> xlabel('Time [h]',fontsize=20)
> ylabel('Elemental N:C [gN/gC]',fontsize=20)
> text (32,0.06,'Dark treated',color='k',fontsize=20)
> text (32,0.13,'Control',color='b',fontsize=20)
> text (32,0.03,'Difference',color='r',fontsize=20)
>
Replace these:
>
> Rectangle((12,0.01),12,0.01,fill=True, fc='k', visible=True)
> show()
>
With these:
rect = Rectangle((12,0.01),12,0.01,fill=True, fc='k', visible=True)
xx1.add_patch(rect)
show()
Rectangle isn't like the pylab function. It is a class that creates a
Rectangle patch. You need to then manually add this patch to the axes
object (xx1 in your script).
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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