Re: checking whether file is landscape or portrait

[context@vivaldi.net]

Hello Pablo,

also Lua might be useful for you - some code like the one bellow, which 
is based on an answer in this forum years ago:

----
assert(not figures.getinfo2)

figures.getinfo2 = function(name, page) -- [ [NTG-context] Pdf info with 
Lua/Ctx API ]
   if type(name) == "string" then
     name = { name = name, page = page }
   end

   if name.name then
     local data = figures.push(name)
     local info = figures.identify()

     if info.status.status ~= 0 then
       figures.check() -- !Counts pages here!
     end

     figures.pop()

     return --data
            info
   end
end
----

'info' might return not only width and height of the image, but also its 
orientation/rotation.
And it would be up to you whether to swap width/height depending on 
orientation.

Hope this helps.

Best regards,

Lukas


On 2020-01-29 16:44, Pablo Rodriguez wrote:
> On 1/29/20 2:31 PM, Arthur Reutenauer wrote:
>> On Tue, Jan 28, 2020 at 05:43:36PM +0100, Pablo Rodriguez wrote:
>>> I’m afraid this is the second time I’m aware of the existence of 
>>> \ifdim
>>> (the first time was when reading previous message from Taco 😅).
>> 
>>   It’s a TeX primitive.  From the TeXbook, chapter 20:
>> 
>> 	* \ifdim<dimen1><relation><dimen2>  (compares two dimensions)
>> 	This is like \ifnum, but it compares two <dimen> values.  For
>> 	example, to test whether the value of \hsize exceeds 100pt, you
>> 	can say	‘\ifdim\hsize>100pt’.
>> 
>>   The definition of \ifnum, right above it, states:
>> 
>> 	* \ifnum<number1><relation><number2>  (compares two integers)
>> 	The <relation> must be either ‘<’ or ‘=’ or ‘>’.  The two
>> 	integer numbers are compared to each other in the usual way, and
>> 	the result is true or false accordingly.
> 
> Many thanks for your reply, Arthur.
> 
> The explanation is extremely clear. I think I should try to read the
> TeXbook (but I need time for this first).
> 
> Many thanks for your help,
> 
> Pablo
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________