Re: checking whether file is landscape or portrait

[Taco Hoekwater <taco@elvenkind.com>]

Hi Pablo,

I have had lots of problems with getting the correct figure dimensions
for external images. In the end, I now use the code below. It is just
as low-level and much more inefficient than your code, but it has not 
failed me yet.

  \newdimen\MYfigurewidth
  \newdimen\MYfigureheight
  \unexpanded\def\MYgetfiguredimensions
    {\dodoubleempty\MYdogetfiguredimensions}
  
  \def\MYdogetfiguredimensions[#1][#2]%
    {\setbox0=\hbox{\externalfigure[#1][#2]}%
     \MYfigurewidth=\wd0
     \MYfigureheight=\ht0 } 

And used like:

       \MYgetfiguredimensions[cow.pdf][page=1]
       \ifdim\MYfigurewidth>\MYfigureheight
       …
       \fi

and I only use Hans’ \getfiguredimensions when I need to know a pdf page count.

It is not that Hans’ macro is bad, but external figures (especially PDF, 
but also PNGs) can be very misbehaved.

Actually forcing the inclusion into a box is crude but at least it will 
always return results identical to any actual desired inclusion.

Best wishes,
Taco

> On 28 Jan 2020, at 16:51, Pablo Rodriguez <oinos@gmx.es> wrote:
> 
> Dear list,
> 
> I have to check whether an external PDF document is portrait or
> landscape (in order to manipulate it in different ways).
> 
> From what I understand of grph-inc.mkiv, I came with the following sample:
> 
>    \unprotect
>    \def\figureXSize{\clf_figurestatus{width}{}}
>    \def\figureYSize{\clf_figurestatus{height}{}}
>    \protect
> 
>    \setupexternalfigures[location=default]
>    \starttext
>    \getfiguredimensions[cow.pdf]
>    \figuresize\\
>    \figurelabel\\
>    \figureXSize\\
>    \figureYSize\\
>    \ifnum\figureXSize<\figureYSize portrait\else landscape\fi
>    \stoptext
> 
> I feel bad of abusing the ConTeXt source in such a miserable way. But
> I’m afraid this is the best I can.
> 
> Is there no standard way to check portrait or landscape on a given
> figure? A conditional for that would be useful.
> 
> At least, I would like to know how to get image dimension numbers
> suitable to be deployed with \ifnum.
> 
> Many thanks for your help,
> 
> Pablo
> --
> http://www.ousia.tk
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Taco Hoekwater
Elvenkind BV




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