[Xy-pic] Background colour

[Damjan Perenic]

On Tue, Feb 22, 2011 at 1:46 AM, Daniel Müllner
<nospamplease at stanford.edu> wrote:
> Hi Damjan,
>
> currently, the xypdf driver cannot vary the line thickness. In fact, support
> for Xy-pic's "line" extension is the last piece that is missing for
> completeness. I simply haven't had the time to implement it, but I am
> definitely planning to add this.
>
> For now, I am afraid that I must recommend the PostScript driver if you need
> lines of different widths in your diagrams.

Is it possible to "frame" an arrow? Then I could make an invisible
line with coloured frame. For lines (not arrows) this would work.

I experimented with \ar@{-}@[F-][r] but could not get the results I wanted.

Damjan