>>I don't think this is going to make it easy to do what you want
It might if I could find the x,y data in the LineCollection objects. There
is an undocumented function in the LineCollection class called
get_paths(), which looks like it returns a list of Path objects. These
path objects have a vertices property which looks like the stuff I want.
I'll explore this for a while. Anyone who knows more about these objects,
feel free to chime in!
Thanks,
Mike
Eric Firing <[EMAIL PROTECTED]>
12/03/08 01:59 PM
To
Mike Hearne <[EMAIL PROTECTED]>
cc
matplotlib-users@lists.sourceforge.net
Subject
Re: [Matplotlib-users] Contour line data
Mike Hearne wrote:
>
> How can I get the actual x,y data that represents the contour lines that
> are drawn with the contour() function?
>
> I'd like to be able to redraw portions of those lines with different
> styles (dashed, dotted, etc.)
>
> For example, given the following sample code (lifted from the
> sourceforge example):
>
> from pylab import *
> from numpy import *
>
> delta = 0.025
> x = arange(-3.0, 3.0, delta)
> y = arange(-2.0, 2.0, delta)
> X, Y = meshgrid(x, y)
> Z1 = bivariate_normal(X, Y, 1.0, 1.0, 0.0, 0.0)
> Z2 = bivariate_normal(X, Y, 1.5, 0.5, 1, 1)
> # difference of Gaussians
> Z = 10.0 * (Z2 - Z1)
> figure()
> cs = plt.contour(X, Y, Z)
> show()
>
> How could I, for example, re-draw the lines in the region X [0 1] Y
> [-1.5 -0.5] as dashed?
>
> I could do it, I think, if I had the for all the lines in the plot.
I don't think this is going to make it easy to do what you want, but
cs.collections is a list of LineCollection objects corresponding to the
contour levels in cs.levels.
Eric
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