Henning Hraban Ramm via ntg-context schrieb am 13.11.2022 um 11:37:
One problem left with dimensions that I can’t reproduce in a minimal
example:
I want to calculate the spine width of the cover from the number of
content pages:
\useexternalfigure[CONTENT][book.pdf]
\getfiguredimensions[CONTENT]
\definemeasure[SpineWidth][2mm + (0.135mm * \noffigurepages/2)]
You can try
\expanded{\definemeasure[SpineWidth][...]}
That works so far, if I output \measure{SpineWidth} it shows the right
size (~42pt).
But if I use this measure in
\setlayer[width=\measure{SpineWidth}]{...}
it’s very small.
I guess \noffigurepages is 1 at that point (from another image) and
I’d need to expand it first.
Am I right that the expansion happens only at the “execution” of
\measure? How would I do that? \expanded\noffigurepages doesn’t work.
Another issue:
0.135mm is the paper thickness of 90 g/m² (= 0.09mm per sheet) with
1.5 bulk. But
\definemeasure[SpineWidth][2mm + (0.09mm * 1.5 * 90)]
doesn’t work:
You can use integers to multiply or divide a length, a float is only allowed
before a length. e.g. 1.5\scratchdimen or 1.5\dimexpr ...\relax
In your case you have to use
\definemeasure[SpineWidth][2mm + (0.09mm * 3 * 90 / 2)]
or
\definemeasure[SpineWidth][2mm + (0.09mm * 135)]
Wolfgang
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