Set up external figure for particular image type

Set up external figure for particular image type

[Thangalin via ntg-context]

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A document has a mix of SVG and PNG images. Changing the parameters for
`\setupexternalfigure` affects both SVG and PNG images. Consider the
following code:

    \setupexternalfigures[
      order={svg,pdf,png,jpg},
      location={local,default,global},
      directory={images},
      maxwidth=\textwidth,
      maxheight=0.4\textheight
    ]

I'd like to change the `maxheight` option for only PNG images, such as:

    \setupexternalfigure[
      method=png,
      maxwidth=\textwidth,
      maxheight=\textheight,
    ]

However, this affects SVG images as well.

How do you apply different external figure setups based on image type?

Thank you!

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Re: Set up external figure for particular image type

[Henning Hraban Ramm via ntg-context]

Am 08.07.22 um 17:46 schrieb Thangalin via ntg-context:
> I'd like to change the `maxheight` option for only PNG images, such as:

Define your own figure class with \definexternalfigure:
https://wiki.contextgarden.net/Command/defineexternalfigure

It won’t automatically chose the file format (or maybe it works with 
"order"), but you don’t need to repeat the setting for each instance.

Hraban
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Re: Set up external figure for particular image type

[Thangalin via ntg-context]

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Thank you for the suggestion Hraban.

The source comes from Markdown, which is converted to XML, then typeset
using ConTeXt. There's no Markdown-specific mechanism to relate images to a
particular external figure definition, unfortunately. All images use the
same syntax and are treated the same way. The only part that differs is the
file name extension (and header within the file).

One possibility would be something like:

\setupexternalfigure[
    width=1em,
    height=1em,
    order={svg,pdf,png,jpg},
    location={local,default,global},
]
\defineexternalfigure[png][
    width=\textwidth,
    height=\textheight,
]
\unprotect
\let\old_externalfigure=\externalfigure
\tolerant\def\externalfigure[#1]#,[#2]#,[#3]{%
    \doifelseinstring{.png}{#1}{%
        \old_externalfigure[#1][png][#2]%
    }{%
        \doifelsefileexists{#1.png}{%
            \old_externalfigure[#1.png][png][#2]%
        }{%
            \old_externalfigure[#1][#2][#3]%
        }%
    }%
}\protect

See: https://tex.stackexchange.com/a/650221/2148

I was wondering if there was a simpler or a solution that's more the
ConTeXt-way?

Thanks again!

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Re: Set up external figure for particular image type

[Rik Kabel via ntg-context]

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On 2022-07-12 14:11, Thangalin via ntg-context wrote:
> Thank you for the suggestion Hraban.
>
> The source comes from Markdown, which is converted to XML, then 
> typeset using ConTeXt. There's no Markdown-specific mechanism to 
> relate images to a particular external figure definition, 
> unfortunately. All images use the same syntax and are treated the same 
> way. The only part that differs is the file name extension (and header 
> within the file).
>
> One possibility would be something like:
> |\setupexternalfigure[ width=1em, height=1em, order={svg,pdf,png,jpg}, 
> location={local,default,global}, ] \defineexternalfigure[png][ 
> width=\textwidth, height=\textheight, ] \unprotect 
> \let\old_externalfigure=\externalfigure 
> \tolerant\def\externalfigure[#1]#,[#2]#,[#3]{% 
> \doifelseinstring{.png}{#1}{% \old_externalfigure[#1][png][#2]% }{% 
> \doifelsefileexists{#1.png}{% \old_externalfigure[#1.png][png][#2]% 
> }{% \old_externalfigure[#1][#2][#3]% }% }% } \protect |
> See: https://tex.stackexchange.com/a/650221/2148
>
> I was wondering if there was a simpler or a solution that's more the 
> ConTeXt-way?
>
> Thanks again!

Assuming that Pandoc markdown is being used, you should be able to set 
class attributes on each image. You can then associate external figure 
definitions with specific classes, and process each individually. 
(Pandoc user guide, link_attributes 
<https://pandoc.org/MANUAL%202.html#extension-link_attributes>)

-- 
Rik


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Re: Set up external figure for particular image type

[Thangalin via ntg-context]

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Thanks, Rik.

Not using Pandoc. I was using Pandoc up until 2020:

https://dave.autonoma.ca/blog/2019/05/22/typesetting-markdown-part-1/

I've since authored KeenWrite <https://github.com/DaveJarvis/keenwrite>,
which uses flexmark-java <https://github.com/vsch/flexmark-java> to
generate XHTML documents from Markdown. The only additions I've made to the
library is to add support for Pandoc's annotation syntax (:::).

That said, I'm also a firm believer in not duplicating information. The
information (file name extension) is already available in the documents, so
adding a classification on top of the extension feels redundant.

Thanks for the suggestion!

On Tue, Jul 12, 2022 at 12:18 PM Rik Kabel via ntg-context <
ntg-context@ntg.nl> wrote:

>
> On 2022-07-12 14:11, Thangalin via ntg-context wrote:
>
> Thank you for the suggestion Hraban.
>
> The source comes from Markdown, which is converted to XML, then typeset
> using ConTeXt. There's no Markdown-specific mechanism to relate images to a
> particular external figure definition, unfortunately. All images use the
> same syntax and are treated the same way. The only part that differs is the
> file name extension (and header within the file).
>
> One possibility would be something like:
>
> \setupexternalfigure[
>     width=1em,
>     height=1em,
>     order={svg,pdf,png,jpg},
>     location={local,default,global},
> ]
> \defineexternalfigure[png][
>     width=\textwidth,
>     height=\textheight,
> ]
> \unprotect
> \let\old_externalfigure=\externalfigure
> \tolerant\def\externalfigure[#1]#,[#2]#,[#3]{%
>     \doifelseinstring{.png}{#1}{%
>         \old_externalfigure[#1][png][#2]%
>     }{%
>         \doifelsefileexists{#1.png}{%
>             \old_externalfigure[#1.png][png][#2]%
>         }{%
>             \old_externalfigure[#1][#2][#3]%
>         }%
>     }%
> }\protect
>
> See: https://tex.stackexchange.com/a/650221/2148
>
> I was wondering if there was a simpler or a solution that's more the
> ConTeXt-way?
>
> Thanks again!
>
>
> Assuming that Pandoc markdown is being used, you should be able to set
> class attributes on each image. You can then associate external figure
> definitions with specific classes, and process each individually. (Pandoc
> user guide, link_attributes
> <https://pandoc.org/MANUAL%202.html#extension-link_attributes>)
>
> --
> Rik
>
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> https://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : https://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : https://contextgarden.net
>
> ___________________________________________________________________________________
>

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Re: Set up external figure for particular image type

[Wolfgang Schuster via ntg-context]

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Thangalin via ntg-context schrieb am 12.07.2022 um 20:11:
> Thank you for the suggestion Hraban.
>
> The source comes from Markdown, which is converted to XML, then 
> typeset using ConTeXt. There's no Markdown-specific mechanism to 
> relate images to a particular external figure definition, 
> unfortunately. All images use the same syntax and are treated the same 
> way. The only part that differs is the file name extension (and header 
> within the file).
>
> One possibility would be something like:
> |\setupexternalfigure[ width=1em, height=1em, order={svg,pdf,png,jpg}, 
> location={local,default,global}, ] \defineexternalfigure[png][ 
> width=\textwidth, height=\textheight, ] \unprotect 
> \let\old_externalfigure=\externalfigure 
> \tolerant\def\externalfigure[#1]#,[#2]#,[#3]{% 
> \doifelseinstring{.png}{#1}{% \old_externalfigure[#1][png][#2]% }{% 
> \doifelsefileexists{#1.png}{% \old_externalfigure[#1.png][png][#2]% 
> }{% \old_externalfigure[#1][#2][#3]% }% }% } \protect |
> See: https://tex.stackexchange.com/a/650221/2148
>
> I was wondering if there was a simpler or a solution that's more the 
> ConTeXt-way?

When you use XML as input you can add additional code to the setups block
which uses \externalfigure to load the image.


\setupexternalfigures [location={local,global,default}]

\defineexternalfigure [jpg] [width=4cm]
\defineexternalfigure [png] [width=8cm]

\starttexdefinition includegraphics #1

     \splitfilename{#1}

     \processaction
         [\splitofftype]
         [    jpg=>{\externalfigure[#1][jpg]},
              png=>{\externalfigure[#1][png]},
          default=>{\externalfigure[#1]},
          unknown=>{\externalfigure[#1]}]

\stoptexdefinition

%\starttexdefinition includegraphics #1
%
%    \getfiguredimensions[#1]
%
%    \processaction
%        [\figurefiletype]
%        [    jpg=>{\externalfigure[#1][jpg]},
%             png=>{\externalfigure[#1][png]},
%         default=>{\externalfigure[#1]},
%         unknown=>{\externalfigure[#1]}]
%
%\stoptexdefinition

\starttext

\includegraphics{hacker.jpg}

\includegraphics{mill.png}

\includegraphics{cow.pdf}

\stoptext

Wolfgang


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Re: Set up external figure for particular image type

[Thangalin via ntg-context]

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Thank you, Wolfgang.

That looks promising.

SVG files are converted using MetaPost. I thought the following would work:

svg=>{\externalfigure[#1][svg][conversion=mp]}

Is there anything else that needs to happen to ensure SVG files are piped
through MetaPost?

Thanks again!



> \setupexternalfigures [location={local,global,default}]
>
> \defineexternalfigure [jpg] [width=4cm]
> \defineexternalfigure [png] [width=8cm]
>
> \starttexdefinition includegraphics #1
>
>     \splitfilename{#1}
>
>     \processaction
>         [\splitofftype]
>         [    jpg=>{\externalfigure[#1][jpg]},
>              png=>{\externalfigure[#1][png]},
>          default=>{\externalfigure[#1]},
>          unknown=>{\externalfigure[#1]}]
>
> \stoptexdefinition
>
> \starttext
>
> \includegraphics{hacker.jpg}
>
> \includegraphics{mill.png}
>
> \includegraphics{cow.pdf}
>
> \stoptext
>
>

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Re: Set up external figure for particular image type

[Wolfgang Schuster via ntg-context]

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Thangalin via ntg-context schrieb am 18.07.2022 um 19:10:
> Thank you, Wolfgang.
>
> That looks promising.
>
> SVG files are converted using MetaPost. I thought the following would 
> work:
>
> svg=>{\externalfigure[#1][svg][conversion=mp]}

You can probably remove the second argument ([svg]) which was used in my 
example to pass the default values with \defineexternalfigure. Just 
using \externalfigure[#1][conversion=mp] where you pass the default 
values with the second argument is enough.

Wolfgang


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Re: Set up external figure for particular image type

[Thangalin via ntg-context]

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Got it working. Complete solution:

\setupexternalfigures[
  location={local,global,default},
  width=\textwidth
]\defineexternalfigure[svg][width=1cm]\defineexternalfigure[jpg][width=2cm]\defineexternalfigure[png][width=4cm]
% Won't be applied because there's no process action.% Default
(\textwidth) is used, as defined
above.\defineexternalfigure[pdf][width=6cm]
\starttexdefinition includegraphics #1
  \splitfilename{#1}

  \processaction[\splitofftype][
    jpg=>{\externalfigure[#1][jpg]},
    png=>{\externalfigure[#1][png]},
    svg=>{\externalfigure[#1][svg][conversion=mp]},
    default=>{\externalfigure[#1]},
    unknown=>{\externalfigure[#1]}
  ]\stoptexdefinition
\starttext
  \includegraphics{kitten.jpg}
  \includegraphics{mill.png}
  \includegraphics{cow.pdf}
  \includegraphics{tiger.svg}\stoptext

Image files attached.
Thanks again!

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Re: Set up external figure for particular image type

[Hans Hagen via ntg-context]

On 8/1/2022 2:29 AM, Thangalin via ntg-context wrote:
> Got it working. Complete solution:
> 
> |\setupexternalfigures[ location={local,global,default}, 
> width=\textwidth ] \defineexternalfigure[svg][width=1cm] 
> \defineexternalfigure[jpg][width=2cm] 
> \defineexternalfigure[png][width=4cm] % Won't be applied because there's 
> no process action. % Default (\textwidth) is used, as defined above. 
> \defineexternalfigure[pdf][width=6cm] \starttexdefinition 
> includegraphics #1 \splitfilename{#1} \processaction[\splitofftype][ 
> jpg=>{\externalfigure[#1][jpg]}, png=>{\externalfigure[#1][png]}, 
> svg=>{\externalfigure[#1][svg][conversion=mp]}, 
> default=>{\externalfigure[#1]}, unknown=>{\externalfigure[#1]} ] 
> \stoptexdefinition \starttext \includegraphics{kitten.jpg} 
> \includegraphics{mill.png} \includegraphics{cow.pdf} 
> \includegraphics{tiger.svg} \stoptext |
I've added:

\setfigureconversion[svg][mp]

So that this works:

\starttext
   \externalfigure[kitten.jpg][width=2cm]
   \externalfigure[mill.png]  [width=4cm]
   \externalfigure[cow.pdf]   [width=6cm]
   \externalfigure[tiger.svg] [width=1cm]
\stoptext

But after we release you need to wikify it.

Hans


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Re: Set up external figure for particular image type

[Albert Krewinkel via ntg-context]

Thangalin via ntg-context <ntg-context@ntg.nl> writes:

> The source comes from Markdown, which is converted to XML, then typeset
> using ConTeXt. There's no Markdown-specific mechanism to relate images
> to a particular external figure definition, unfortunately. All images
> use the same syntax and are treated the same way. The only part that
> differs is the file name extension (and header within the file).

The below is likely overkill and a good bit of work to setup, but it is
also very flexible. Maybe it suits your needs.

The Markdown-to-XML conversion can be tuned to include all the relevant
information. E.g., you could use pandoc with a custom writer to produce
the XML format of your choice. The link below is an example XML writer
that can be tuned as needed.
<https://gist.github.com/tarleb/634b409be0af62ca210cc9e96d41ca8c>

With that setup, one can modify the `Image` function to produce the
output you need. E.g., match on the file name extension use the library
function `pandoc.path.split_extension` and then change the element type
depending on the extension.

This way you'd have all the important information in your XML.
More info: <https://pandoc.org/custom-writers> and
<https://pandoc.org/lua-filters>.

Of course, you could also use pandoc to go directly to ConTeXt; that is
currently my preferred way of producing PDF from Markdown.

Cheers,
Albert

-- 
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
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Re: Set up external figure for particular image type

[Thangalin via ntg-context]

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Of course, you could also use pandoc to go directly to ConTeXt; that is
> currently my preferred way of producing PDF from Markdown.
>

Thanks Albert!

I'm going to stick with my desktop text editor, KeenWrite
<https://github.com/DaveJarvis/keenwrite>, rather than use shell scripts
<https://dave.autonoma.ca/blog/2019/05/22/typesetting-markdown-part-1/> and
pandoc.

Cheers!

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