Marco - thanks for your help!

I found an alternative way to do it that centers the whole caption, including 
the figure label:

\starttext

% Centers the caption text, label is offset (suggested by Marco):
\setupcaptions [headstyle={\hskip-5em\bold},width=4in]
\startplacefigure [title={This is a very, very, very, very, very, very, very, 
very, very, very, very long caption.}]
  \externalfigure [dummy]
\stopplacefigure

% Centers the entire caption, including the label:
\setupcaptions [headstyle=bold,style={\hangindent=6em},distance=2em,width=4in]
\startplacefigure [title={This is a very, very, very, very, very, very, very, 
very, very, very, very long caption.}]
  \externalfigure [dummy]
\stopplacefigure

\stoptext

For both methods the spacing is hardcoded; for my application I ended up 
creating a short macro that checked the length of the figure label and adjusted 
things accordingly so that the the spacing for Figure 10+ worked the same as 
for Figures 1-9.

John



On May 13, 2012, at 6:09 AM, Marco wrote:

> On 2012-05-11 John Dyreby <jjdyreby at wisc.edu> wrote:
> 
>> Or if this formatting works...
>> 
>> How it currently looks:
>> Figure 1  This is a caption that extends
>> to multiple lines.
>> 
>> What I'm trying to get:
>> Figure 1  This is also a caption that
>>                 extends to multiple lines.
> 
> This is a hack, but seems to work:
> 
> \setupcaptions [headstyle={\hskip-5em\bold}]
> \starttext
>       \startplacefigure [title={\input knuth\par}]
>               \externalfigure [dummy]
>       \stopplacefigure
> \stoptext
> 
> Marco
> 
> 
> 

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