Re: A label question

[Hans Hagen <pragma@wxs.nl>]

At 10:22 PM 5/18/01 +0300, Tarik Kara wrote:
>I think the problem is with the \par command. I am not sure
>how you would like to align the label, but the following looks
>ok for me:
>
>label.ulft(btex \vbox{\hbox{The vertical}%
>\hbox{deflection of}%
>\hbox{the center of}%
>\hbox{gravity $y(t)$}} etex, 0.5[z0,z1]); 

This is indeed the most texie way to do it; the stuff between btex/etex is
normally copied to a temp tex file and ends up like : 

\shipout
  \vbox 
     \hbox 
        your stuff 

with some pseudo strut added for spacing. Then tex is run on it, and the
output (dvi) is converted into some metapost pictures (actually strings
drawn infont ...). So, the stuff becomes a hbox and in order to get lines
you need to add a vbox inside the btex/etex. The four \hbox's here make
sure that the lines don't become \hsize. If you use the tex alignment
primitives, you need to nill the tabskip. 

In context, it's far better to use the "textext" macro or to move the tex
code outside the graphic and just call it by name in the mp graphic. That
way you nicely isolate the code. 

Hans
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