Dimensions
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ConTeXt allows different methods to initialize variables and to calculate with dimension units.
\definemeasure
\setupexternalfigures[location={local,global,default}]
\definemeasure[ColumnC][30mm]
\definemeasure[ColumnD][40mm]
\definemeasure[ColumnCD][\the\dimexpr(\measure{ColumnC}+\measure{ColumnD})\relax]
C \measure{ColumnC}
D \measure{ColumnD}
CD \measure{ColumnCD}
\externalfigure[cow][width=\measure{ColumnCD}]
\defineexpandable
\setupexternalfigures[location={local,global,default}]
\defineexpandable\ColumnA {30mm}
\defineexpandable\ColumnB {40mm}
\defineexpandable\ColumnAB {\the\dimexpr(\ColumnA + \ColumnB)\relax}
A \ColumnA
B \ColumnB
AB: \ColumnAB
\externalfigure[cow][width=\ColumnAB]
The behavior of \define has changed. At first the default was expanded, now it is unexpanded. If "unexpanded" is wished some extracommands are neccesary:
\defineexpandable\... same as the lowlevel-TeX-Macro \def\...
\define\... same as the low-level-textmacro \unexpanded\def\...
\newdimen
\setupexternalfigures[location={local,global,default}]
\defineexpandable\ColumnA {30mm}
\defineexpandable\ColumnB {40mm}
\newdimen\ColumnAB \ColumnAB=\dimexpr(\ColumnA + \ColumnB)
A \ColumnA
B \ColumnB
ColumnAB: \the\ColumnAB
\externalfigure[cow][width=\the\ColumnAB]
\externalfigure ist also working without "\the".
\ctxlua
\setupexternalfigures[location={local,global,default}]
\defineexpandable\ColumnA {30mm}
\defineexpandable\ColumnB {40mm}
\defineexpandable\ColumnABii {\ctxlua{context([==[\ColumnA + \ColumnB]==])}}
ColumnABii: \the\dimexpr \ColumnABii\relax
\externalfigure[cow][width=\dimexpr(\ColumnABii)\relax]
Offene Fragen
\the expand \relax
