I don't want to be difficult, but this patch does not give correct
behavior. In particular, this is not true:
> Assume you have a 2cm x 4cm image and want to have it in double size.
> So you would write in the dialog the values 4cm x 8cm but as the
> smaller value is taken as border you get as result again 2cm x4cm image.
This is what the graphicx documentation says:
*keepaspectratio* Boolean valued key like 'clip'. If set to true
then specifying both 'width' and 'height' (or 'totalheight') does
not distort the figure but scales such that neither of the specified
dimensions is exceeded.
This seems the desirable behavior. One wants to be able to say "Scale
this image but do not allow it to take up more than Wcm or Hcm". And one
wants that to remain a correct instruction even if the size and aspect
ratio of the image change.
The attached LaTeX file and graphic demonstrate how this works. The
graphic itself is (about) 2cm wide by 1cm high. For the first image, we
have the options [width=4cm, height=1.5cm, keepaspectratio], and we get
a graphic that is 3cm wide and 1.5 cm high. That's as big as it can get
without exceeding either value. For the second image, we have the
options [width=2cm, height=1.5cm, keepaspectratio]. If it were only the
smaller figure that mattered, as Uwe's patch assumes, then the size of
the graphic would not change. But it does. You get a graphic that is 2cm
wide and 1 cm high.
So the problem with Uwe's patch is that it makes it impossible to have
either of these sets of options. It forces you to have width=height if
you have keepaspectratio.
So it seems to me that only a more extensive re-working of the dialog,
along the lines proposed in
http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg113354.html
will do the trick here. The idea developed in that patch is to use
elements of the dialog to give the user visual feedback about the
effects of setting, or not setting, different options. Another advantage
to that approach is that it could also be used elsewhere---whenever we
want to indicate that, if an option is not specified, then the value is
calculated automatically.
If the basic idea here seems reasonable, then I'll finish that work.
There's only a little more to be done.
Richard
--
==================================================================
Richard G Heck, Jr
Professor of Philosophy
Brown University
http://frege.brown.edu/heck/
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%% LyX 1.4.4 created this file. For more info, see http://www.lyx.org/.
%% Do not edit unless you really know what you are doing.
\documentclass[english]{paper}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{geometry}
\geometry{verbose,letterpaper,tmargin=1in,bmargin=1in,lmargin=1.25in,rmargin=1.25in}
\setlength{\parskip}{\medskipamount}
\setlength{\parindent}{0pt}
\usepackage{graphicx}
\usepackage{setspace}
\onehalfspacing
\makeatletter
\usepackage{babel}
\makeatother
\begin{document}
Text above.
\includegraphics[width=4cm,height=1.5cm,keepaspectratio]{/home/rgheck/files/graphics/test}
More text.
\includegraphics[width=2cm,height=1.5cm,keepaspectratio]{/home/rgheck/files/graphics/test}
Text below.
\end{document}
