[Xy-pic] Re: xy-pic Digest, Vol 12, Issue 5

[Michael Barr]

Since the original file was scratched, I don't know exactly what is wanted 
or what the problem is.  However, I have found the following very helpful 
for getting things vertically centred:
$$\left(\vcenter{
<an xy-pic'ture>
}\right)$$

Try it, although there are no guarantees.  Incidentally, in my diagxy 
package (which is a front end geared to category theory for xy-pic) the 
difference between \bfig...\efig and \xy...\endxy is that the former puts 
the entire picture into a \vcenter box.

Michael Barr

On Sat, 27 Mar 2004 xy-pic-request at tug.org wrote:

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> Today's Topics:
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>    1. Problem with skewing(?) (Richard Lewis)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 24 Mar 2004 10:58:53 +0000
> From: Richard Lewis <xypic at rtf.org.uk>
> Subject: [Xy-pic] Problem with skewing(?)
> To: xy-pic at tug.org
> Message-ID: <8565cubjf6.fsf at rtf.org.uk>
> Content-Type: text/plain; charset="us-ascii"
> 
> Hi everyone,
> 
> I am trying to define a command \SliceObj (that will take three
> arguments: top, label and bottom) to typeset a vertical arrow, framed with parentheses (...),
> whose reference point should be the middle of the label.
> 
> Something like
>            
>    /       \
>   |  {#1}   |
>   |   |     |
>   |   |{#2} |
>   |   |     |
>   |   V     |
>   |  {#3}   |
>    \       /
> 
> with the reference in the middle of {#2}
> 
> I can draw the arrow and frame it (See attached .tex file), and I
> thought i could use the skewing operator (!) to move the reference
> point to the new positon:
> 
> "arrow-with-frame"!<new position>
> 
> However I can't get this to work: the position we end up after the
> skew is not <new position>, as (i think) the attached file shows, what
> am i doing wrong?
> 
> (This happens with or without the xymods.tgz patches, so presumably I
> have misunderstood something about the skewing operation?)
> 
> 
> Worse, trying to use my attempt inside an \xygraph can produce
> infinite loops (two examples of this can be found, commented out, in
> the attached file)
> 
> Any help gratefully appreciated!
> 
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> End of xy-pic Digest, Vol 12, Issue 5
> *************************************
>