Hey list,

I have a lot of fairly large diagrams in my book that don't always match
the aspect ratio of the page in landscape mode, though they usually are
closer to landscape than a portrait layout for the page dimension.

How can I insert a figure so that it is of a given size, with the page
size perfectly cropped around it?

The closest I have right now is this which is rather awful:

\definepapersize[main][A4][A4]
\definepapersize[diagram][A4,landscape][A4,landscape]

% Insert a full page landscape diagram, parameters are node name,
caption, and path...
\def\FullPageLandscapeDiagram#1#2#3%
{
    \page 
    \setuppapersize[diagram]
    \setuplayout[fullpage]
    \startframedtext[width=.95\textwidth,bottom=\vss,top=
\vss,align=right,corner=rectangular]
    \placefigure
        [force][figure:#1]
        {#2}
        {\externalfigure[#3][width=.95
\textwidth,background=color,backgroundcolor=colour_figure_background]}
    \stopframedtext
    \page
    \setuppapersize[main]
    \setuplayout[reset]
}

-- 
Kip Warner -- Software Engineer
OpenPGP encrypted/signed mail preferred
http://www.thevertigo.com