On 28-10-2011 10:35, Wolfgang Schuster wrote:
Am 28.10.2011 um 08:55 schrieb Thomas A. Schmitz:
Luigi, Patrick,
thanks for your explanations! The point of my question was: can I feed the content of tex.dimen["textwidth"] directly back to TeX, and the answer to this appears to be "no"; you need to add some unit to it (otherwise, you get an error message). Which was a bit confusing to me at first, because the name tex.dimen implies that it holds a "real" dimension, like \newdim does.
You can get the same value in TeX when you print the value of a dimension with \number:
\starttext
\scratchdimen=3pt
\number\scratchdimen
\ctxlua{context(tex.dimen["scratchdimen"])}
\stoptext
which also means that you can say \scratchcounter=\scratchdimen and test dimens as if they are numbers ... this is why we can have \let\ifzeropt\ifcase which probably no one ever noticed in the source. Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------