Re: [NTG-context] [***Spam/VIR***] Re: Layer vs. overlay

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Hello,

On Wed, 16 Jan 2013 12:47:21 +0100, Philipp Gesang wrote:

...

Lookup the correct string from a table?

thanks for the idea -

- in other words, we have to keep running results somewhere;

Yes, this is simple because the order of processing doesn’t change -- as long as the data you aggregate fits into your memory, of course!

the algorithm fills a table with texts for each page, and each \setlayer takes one value back, so we can simplify to:

</snip>

\setlayer[beforetext][preset=righttop] {\framed[width=2in]{\directlua{context(table.remove(userdata.LPr.texts, 1))}}}

</snip>

context.startTEXpage { background = "foreground,beforetext" } table.insert(userdata.LPr.texts, "BEF" .. i)

context.externalfigure({"cow"},{width="30cm"}) context.stopTEXpage()

From my tests calling table.remove() to remove the first element in a list is extremely inefficient compared to accessing an array. (For 10^5 elements it’s 1m41.644s vs. 0m0.030s on my machine.) While we’re at it, table.insert() involves an extra function call that carries another perfomance penalty, albeit a much smaller one. Your code should do the same, though. Regards Philipp