[Xy-pic] Re: positioning in XY-Pic, redux

[Ross Moore]

> Pardon me, the editor blew up. :)
> 
> So,
> 
> how does one place a collection of circles with prescribed radii and
> prescribed centers into an XY-Pic box?
> 
> Let's hardcode all the dimensions.  By analogy with, say,
> 
> \begin{xy}
> <1cm,1cm>*{11}
> ,<2cm,2cm>*{22}
> ,<0cm,2cm>*{02}
> ,<2cm,0cm>*{20}
> \end{xy}
> 
> I was hoping this would work:
> 
> \begin{xy}
> {\ellipse<1cm>{}}
> ,<0cm,1cm>{\ellipse<2cm>{}}
> ,<1cm,0cm>{\ellipse<3cm>{}}
> \end{xy}
> 
> But it doesn't, since XY-Pic doesn't even pick up the "coordinates"
> <1cm,0cm>, and just pastes the third circle with its center somewhere at
> the "current c", which is a part of the second circle.
> 
> Does this have to do with the fact that \ellipse is a "decor", or with
> some fundamental misunderstanding on my part as to how XY-Pic thinks of
> the "c" and "p" positions, and the syntax of moving them?

Yes, it is related to this.
The correct syntax is:

 ,<0cm,1cm>,{\ellipse<2cm>{}}
           ^-------------------  need this
 ,<1cm,0cm>,{\ellipse<3cm>{}}
           ^-------------------  and this

See:

http://www-texdev.ics.mq.edu.au/BEKE/xytest/



> 
> Please let me know, as basically this is what's keeping me from being able
> to complete a paper! :)
> 
> Thanks greatly,


Hope this helps,

	Ross

 
> Tibor Beke  (Dept. Math, U. Michigan, USA)
>