meaning of ! in \includegraphics in graphicx

[Paulo Ney de Souza]

Many thanks.

Paulo Ney

On Wed, Jan 22, 2020, 12:00 AM David Carlisle <d.p.carlisle at gmail.com>
wrote:

> On Wed, 22 Jan 2020 at 03:56, Paulo Ney de Souza <pauloney at gmail.com>
> wrote:
> >
> > What is the (precise) meaning of ! in a command like
> >
> >    \includegraphics[width=.8\textwidth,height=!]{figure.eps}
>
> this is trapped and converted to
> \resizebox{.8\textwidth}{!}{\includegraphics{figure.eps}}
>
> which, as you say scales the width to the specified width, and the
> height by the same scale factor.
>
> Or at least that's what is supposed to happen, there are a lot of
> different code paths here depending on what driver option you are
> using.
>
> \def\Gin at eresize{\height}
> \def\Gin at esetsize{%
>   \let\@tempa\Gin at exclamation
>   \if at tempswa
> %    \end{macrocode}
> %  External. Wrap the |\includegraphics| command in a call to the
> %  internal form of |\scalebox| to handle the rotation.
> %    \begin{macrocode}
>     \edef\@tempa{\toks@{\noexpand
>              \Gscale@@box\noexpand\Gin at eresize
>               {\Gin at ewidth}{\Gin at eheight}{\the\toks@}}}%
>     \@tempa
>   \else
> %    \end{macrocode}
> % Internal. Handle scaling with the |\includegraphics| command directly
> % rather than calling |\scalebox|.
>
>
> David
>
>
>
> >
> > I started by guessing that the graphics would be reslzed by the
> proportion defined on the other axis .. but after some further
> experimentation I an not really convinced ...
> >
> > The documentation is completely silent on it. The only mention of ! in
> in the context f \resizebox some text.
> >
> > Paulo Ney
>
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