checking whether file is landscape or portrait

checking whether file is landscape or portrait

[Pablo Rodriguez]

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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Re: checking whether file is landscape or portrait

[Taco Hoekwater]

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
> ___________________________________________________________________________________
> 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
> ___________________________________________________________________________________

Taco Hoekwater
Elvenkind BV




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___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Wolfgang Schuster]

On Tue, 28 Jan 2020 16:51:35 +0100
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.

Use \ifdim to compare dimensions.

\setupexternalfigures[location=default]

\starttext

\getfiguredimensions[mill.png]

\ifdim\figurewidth>\figureheight
  landscape%
\else
  portrait%
\fi

\getfiguredimensions[cow.pdf]

\ifdim\figurewidth>\figureheight
  landscape%
\else
  portrait%
\fi

\stoptext

Wolfgang
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___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Pablo Rodriguez]

Many thanks for your reply, Taco. It helps me a lot to manipulate the
images (which are actually PDF documents).

I have another question about an issue that I experience at work.

Some of the PDF documents I have to deal with are poorly generated.
There are misplaced A4 pages inside legal paper sizes.

I thought there were malformed in such a way:

    \showframe
    \setuppapersize[A4][legal]
    \starttext
    \dorecurse{10}{\input{zapf}}
    \stoptext

So my approach was:

    \setuplayout[page]
    \starttext
    \getfiguredimensions[a-test.pdf]
        \page[right]\dorecurse{\noffigurepages}
            {\externalfigure[a-test.pdf][page=\recurselevel]}
    \stoptext

But after a closer inspection, the docuemnts are properly malformed.
They include some top and left extra margins.

Is there any way to remote those extra margins? (Offset doesn’t seem to
work here.)

Many thanks for your help again,

Pablo


On 1/28/20 5:04 PM, Taco Hoekwater wrote:
> 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
___________________________________________________________________________________
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/
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___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Pablo Rodriguez]

On 1/28/20 5:15 PM, Wolfgang Schuster wrote:
> On Tue, 28 Jan 2020 16:51:35 +0100 Pablo Rodriguez wrote:
>> [...]
>> At least, I would like to know how to get image dimension numbers
>> suitable to be deployed with \ifnum.
>
> Use \ifdim to compare dimensions.

Many thanks for your reply, Wolfgang.

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 😅).

Many thanks for your help,

Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
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
___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Wolfgang Schuster]

On Tue, 28 Jan 2020 17:04:52 +0100
Taco Hoekwater <taco@elvenkind.com> wrote:

> 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.


I modified your code a bit to give it the ConTeXt touch.


Alternative 1:

\setupexternalfigures[location=default]

\starttext

\unexpanded\def\doifelselandscape
  {\dowithnextbox
     {\ifdim\nextboxwd>\nextboxht
        \expandafter\firstoftwoarguments
      \else
        \expandafter\secondoftwoarguments
      \fi}
   \hbox}

\doifelselandscape{\externalfigure[cow.pdf]}{YES}{NO}

\doifelselandscape{\externalfigure[mill.png]}{YES}{NO}

\blank

\unexpanded\def\doifelselandscapefigure#1#2%
  {\doifelselandscape{\externalfigure[#1][#2]}}

\doifelselandscapefigure{cow.pdf}{}{YES}{NO}

\doifelselandscapefigure{mill.png}{}{YES}{NO}

\stoptext


Alternative 2:

\setupexternalfigures[location=default]

\newif\iflandscape

\unexpanded\def\checkiflandscape
  {\dowithnextbox
     {\ifdim\nextboxwd>\nextboxht
        \landscapetrue
      \else
        \landscapefalse
      \fi}
   \hbox}

\starttext

\checkiflandscape{\externalfigure[cow.pdf]}

\iflandscape
  YES
\else
  NO
\fi

\checkiflandscape{\externalfigure[mill.png]}

\iflandscape
  YES
\else
  NO
\fi

\stoptext


Wolfgang
___________________________________________________________________________________
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___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Arthur Reutenauer]

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.

  Best,

		Arthur
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___________________________________________________________________________________

Re: checking whether file is landscape or portrait

[Pablo Rodriguez]

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
--
http://www.ousia.tk
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Re: checking whether file is landscape or portrait

[context]

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
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