Re: [Matplotlib-users] findobj in pylab

[John H. <jd...@gm...>]

On Thu, Jul 3, 2008 at 8:42 AM, John Kitchin <jki...@an...> wrote:
> Thanks Matthias. That is a helpful example.
>
> I have been trying to figure out how to recursively examine all the objects
> in fig to see if there is a particular settable property. It seems like the
> algorithm has to be recursive so that it goes deep into all the lists, etc.
> I have not figured out how to know when you have reached the bottom/end of a
> trail.
>
> Such a function would let me set any text property in the whole figure
> without needing to know if it was a text object, label, legend, etc... maybe
> that is not as valuable as I think it would be though.

This is a good idea, and I just added an artist method "findobj" in
svn that recursively calls get_children and implements a match
criteria (class instance or callable filter).  There is also a
pyplot/pylab wrapper that operates on current figure by default.  Here
is an example:



import numpy as np
import matplotlib.pyplot as plt
import matplotlib.text as text

a = np.arange(0,3,.02)
b = np.arange(0,3,.02)
c = np.exp(a)
d = c[::-1]

fig = plt.figure()
ax = fig.add_subplot(111)
plt.plot(a,c,'k--',a,d,'k:',a,c+d,'k')
plt.legend(('Model length', 'Data length', 'Total message length'),
           'upper center', shadow=True)
plt.ylim([-1,20])
plt.grid(False)
plt.xlabel('Model complexity --->')
plt.ylabel('Message length --->')
plt.title('Minimum Message Length')

# match on arbitrary function
def myfunc(x):
    return hasattr(x, 'set_color')

for o in fig.findobj(myfunc):
    o.set_color('blue')

# match on class instances
for o in fig.findobj(text.Text):
    o.set_fontstyle('italic')



plt.show()