Re: [matplotlib-devel] linestyle dash tuple?

On Thu, Sep 4, 2008 at 3:30 PM, Ryan May <rm...@gm...> wrote:
> Hi,
>
> In the process of documenting "linestyles" for contour, I noticed that
> in a lot of places, linestyle can be this dash tuple, which is described
> in Collection as:
>
>                The dash tuple is::
>
>                 (offset, onoffseq),
>
>             where *onoffseq* is an even length tuple of on and off ink
>             in points.
>
> But for the life of me, I cannot make this work.  Can anyone give me a
> better explanation, or better yet, a working small example (that we
> could hopefully add to the example directory)?

examples/pylab_examples/dash_control.py uses custom on/off ink, but
not the offset.  In fact, in the Line2D.set_dashes method, I see that
the offset support is reserved for a TODO.  So perhaps you should just
fix the docstring to remove the offset language and just include the
on/off sequence for ink

    def set_dashes(self, seq):
        """
        Set the dash sequence, sequence of dashes with on off ink in
        points.  If seq is empty or if seq = (None, None), the
        linestyle will be set to solid.

        ACCEPTS: sequence of on/off ink in points
        """
        if seq == (None, None) or len(seq)==0:
            self.set_linestyle('-')
        else:
            self.set_linestyle('--')
        self._dashSeq = seq  # TODO: offset ignored for now

>
> Thanks,
>
> Ryan
>
> --
> Ryan May
> Graduate Research Assistant
> School of Meteorology
> University of Oklahoma
>
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