Re: [Matplotlib-users] Re: overriding default color order and linetypes

[Ryan K. <rya...@gm...>]

Thanks Jouni.

I can modify the color order using gca() and _getlines.colors, as you
mentioned.  But if I can't specify the line type in a similar fashion,
then this approach isn't going to work for me.

The trick with the other approach (with a global counter for how many
lines are on the plot), is how to reset the counter for each new plot.
 gca()._get_lines.count seems to handle this problem by counting the
lines already on the axis.  (I wouldn't have known to poke around
there if you had got me started.)

So, unless a cleaner approach is suggested by someone else, I am going
to follow an approach similar to Jouni's suggestion, only using
gca()._get_lines.count+1 as the index to my global colors and line
types list so that I am always calling plot (or actually semilogx)
with explicit linetype specifications (like 'y-','b--',...)

Any better ideas?

Ryan

On 5/18/06, Jouni K Seppanen <jk...@ik...> wrote:
> "Ryan Krauss" <rya...@gm...> writes:
>
> > How do I change the default color order
>
> The colors are hardwired in the pylab interface, but you can hack
> around it:
>
>    gca()._get_lines.colors = ['#101050', '#105010', '#501010']
>    gca()._get_lines.Ncolors = 3
>    gca()._get_lines.firstColor = '#101050'
>
> Support for this might be a useful addition to the pylab interface.
> Does anyone know how to do this in Matlab?
>
> > and how do I set up a similar default linetype order, so that the
> > first call to plot generates a solid line and the second a dashed
> > one (for example).
>
> I don't think there is support for this in pylab.
>
> Of course, if all your plot calls just draw a single line, you can
> cycle both the color and the line style easily by defining your own
> function:
>
>    my_colors = ['b','g','r']; my_styles = ['-', ':', '--']
>    my_c = 0; my_s = 0
>    def plot(x, y):
>        global my_colors, my_styles, my_c, my_s
>        pylab.plot(x, y, my_colors[my_c % len(my_colors)]
>                         + my_styles[my_s % len(my_styles)])
>        my_c += 1; my_s += 1
>
> But if you want the full pylab.plot argument parsing functionality,
> the easiest thing would probably be to implement this in
> matplotlib.axis.
>
> --
> Jouni
>
>
>
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