Moving horizontally a whole ensemble of layers in the same run?

[Rudolf Bahr <quasi@quasi.de>]

Hi Hans,

assume we fixed between "\definelayer" and "\flushlayer" a whole ensemble
of layers on a page. And by calculating per luacode we determined the leftmost
and the rightmost edge of the ensemble and would now like to horizontally centre
the ensemble. We don't know the rightmost edge before we placed the last layer.
By luacode we can calculate how much the centring movement should be, because we
know "\textwidth", but we cannot save the calculated centring value in the context
program for another run. Saving the luacode values of hundred of pages in flattened
lua tables would be possible, but rather awkward; the problem of relating pages to
tables would arise, especially when pages are taken out or additional pages are
inserted.

Do you know a way to settle the centring in the same context run in which the layers
are placed? Could "\flushlayer" perform it somehow?

Rudolf
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