[Matplotlib-users] drawing horizontal line on bar chart

[mdekauwe <mde...@gm...>]

Hi,

I am plotting overlapping bars in a bar chart. In some places one bar
overlaps the other so I would like to draw a horizontal line to show where
the underlying bar extends to. My plots are postscripts so I can't use
alpha. The only way I could come up with involves me figuring out by trial
and error where each bar starts, for example:

bar_width = 0.068
xmin_line = 0.198
xmax_line = xmin_line+bar_width
plt.axhline(y=data_biomass[2], xmin=xmin_line, xmax=xmax_line, linewidth=2,
color="b")

Is there a way I can work out where each bar starts and how wide it is? I
tried ax.get_xticks, but these don't match with the above function which
only seems to be a fraction of 0 - 1.

thanks,

Martin
        



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