You probably know about combinations to place images side by side:
\startcombination[3*1]
{\externalfigure[cow]}{cow}
{\externalfigure[mill]}{mill}
{\externalfigure[hacker]}{hacker}
\stopcombination
Now, the widths aren’t calculated automatically.
You could define them on your own:
\startcombination[3*1]
{\externalfigure[cow] [width=.3\textwidth]}{cow}
{\externalfigure[mill] [width=.3\textwidth]}{mill}
{\externalfigure[hacker][width=.3\textwidth]}{hacker}
\stopcombination
But that’s ugly and tedious. Hans did it for you:
\definemeasure[combination][
(\textwidth
-\effectiveleftskip
-\effectiverightskip
-\numexpr\combinationparameter\nx-\plusone\relax\dimexpr\combinationparameter\distance\relax
)/\combinationparameter]
So you can say:
\startcombination[3*1]
{\externalfigure[cow] [width=\measure{combination}]}{cow}
{\externalfigure[mill] [width=\measure{combination}]}{mill}
{\externalfigure[hacker][width=\measure{combination}]}{hacker}
\stopcombination
But that’s still tedious.
With the power of \defineexternalfigure:
\defineexternalfigure[combination][width=\measure{combination}]
(That’s predefined, no need to copy!)
\startcombination[3*1]
{\externalfigure[cow] [combination]}{cow}
{\externalfigure[mill] [combination]}{mill}
{\externalfigure[hacker][combination]}{hacker}
\stopcombination
Beautiful. ;)
Have fun,
Hraban
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