From: Hans Hagen <pragma@wxs.nl>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Cc: Mari Voipio <mari.voipio@iki.fi>
Subject: Re: Getting changing/random graphics?
Date: Thu, 16 Feb 2012 10:48:28 +0100 [thread overview]
Message-ID: <4F3CD0EC.9080306@wxs.nl> (raw)
In-Reply-To: <CAGbDsP1KpAJc5h3fJsXt=REX6pb92cfg__J5N6tBRRY6me84Ug@mail.gmail.com>
On 16-2-2012 07:43, Mari Voipio wrote:
> Hello all,
>
> I'm trying to do something that should be possible and I think
> "variables" is the answer, I just can't figure out how.
>
> I have a pile of photos (jpg) in a directory and the assumption is
> that they are all the same size and there's a spot for the photo on a
> layer at the top of the page. I already found out how I can get
> ConTeXt to draw the layer separately for each page (at
> http://wiki.contextgarden.net/layers#Use_dynamic_content), but I think
> I need a "variables for dummies" page...
>
> This time I'm not too picky, the images can be used randomly or in the
> order they are in the directory and then cycled, I'd just like to use
> more than one (and I'm so not doing every page by hand).
>
>
> So, if I have
>
> photo1.jpg
> photo2.jpg
> photo3.jpg
> photo4.jpg
>
>
> and \dorecurse{10}{insert random photo here}, how do I do it?
More fancy ...
\startluacode
local files = { }
function document.collectgraphics(pattern)
files = table.merged(files,dir.glob(pattern))
files = table.unique(files)
table.sort(files)
logs.report(string.format("graphics: %s",table.concat(files," ")))
end
function document.choosegraphics()
if #files > 0 then
context(table.remove(files, math.random(1,#files)) or "dummy")
else
context("dummy")
end
end
\stopluacode
\def\CollectGraphics[#1]{\ctxlua{document.collectgraphics("#1")}}
\def\ChooseGraphic {\ctxlua{document.choosegraphic()}}
\CollectGraphics[*.png]
\CollectGraphics[*.jpg]
\starttext
\dorecurse {10} {
\expanded{\externalfigure[\ChooseGraphic][width=4cm]}
}
\stoptext
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next prev parent reply other threads:[~2012-02-16 9:48 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-16 6:43 Mari Voipio
2012-02-16 9:48 ` Hans Hagen [this message]
2012-02-16 9:50 ` Hans Hagen
2012-02-22 8:22 ` Mari Voipio
2012-02-16 9:53 ` Marco
2012-02-22 7:32 ` Mari Voipio
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