[Matplotlib-users] circle collection get_facecolors in Basemap

2009-09-22 Thread John [H2O]

Hello,

I'm trying to plot text objects with the color used in m.scatter. My goal is
to individually label each scatter object. I've tried the following:

circles=m.scatter(cx,cy,zsize,zlevel,cmap=cmap)

and then:
CC = circles.get_facecolor()
i=0
for x,y in map(cx,cy):
ax.text(x,y,'some text', color=CC[i])

But if fails because:

m.scatter returns:
matplotlib.collections.CircleCollection object at 0x127898d0

Rather than a list of objects??? Or something. The point is, I would expect
'circles' above to have len==cx, but it does not. What am I doing wrong?



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Re: [Matplotlib-users] circle collection get_facecolors in Basemap

2009-09-22 Thread Eric Firing
John [H2O] wrote:
 Hello,
 
 I'm trying to plot text objects with the color used in m.scatter. My goal is
 to individually label each scatter object. I've tried the following:
 
 circles=m.scatter(cx,cy,zsize,zlevel,cmap=cmap)
 
 and then:
 CC = circles.get_facecolor()
 i=0
 for x,y in map(cx,cy):
 ax.text(x,y,'some text', color=CC[i])
 
 But if fails because:
 
 m.scatter returns:
 matplotlib.collections.CircleCollection object at 0x127898d0
 
 Rather than a list of objects??? Or something. The point is, I would expect
 'circles' above to have len==cx, but it does not. What am I doing wrong?

The first thing you are doing wrong is failing to provide a complete, 
minimal, self-contained example illustrating the problem.  I don't think 
the snippet you gave is representative of what you are running.  Instead 
of map I think you mean zip.  Where are you incrementing i?

The general approach of using the get_facecolor() method to get the 
array, and indexing into it, is fine.  That is not where the problem is. 
  Once you put together a minimal example, I think you will find the 
problem--or that there really is no problem.

A collection is used by scatter because it is much more efficient than a 
sequence of objects.

Eric

 
 
 


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