2012-11-26 Sietse Brouwer:
> Since I don't use MetaPost, I don't think I'm the best person to
> document this. But I took this as an opportunity to create the command
> reference pages for a bunch of the \...MP... commands; perhaps one of
> you could add this info to the proper page(s)?
Thanks. I added some info about the change mentioned in this thread.
> Also: a question about
> \startuseMPgraphic and
> \startuniqueMPgraphic.
> Both are supposed to be recompiled at every usage, so how are they
> different? Actually trying it out suggests that useMPgraphic is the
> only one of the two that re-evaluates its code every time; compare the
> examples at
AFAIK useMPgraphic is always recalculated, reusableMPgraphic never
is. uniqueMPgraphic takes the size into account and recalculates if
the graphic dimensions change. If I recall correctly this is
mentioned somewhere in the MetaFun manual. But I agree, all these
commands for including MP graphics are confusing, given the fact
that one can survive pretty well with only useMPgraphic. I attached
a small example to show the difference.
Marco
\startuseMPgraphic{alpha}
fill unitsquare
xyscaled (\overlaywidth, \overlayheight)
withcolor (uniformdeviate 1, uniformdeviate 1, uniformdeviate 1);
\stopuseMPgraphic
\defineoverlay
[alpha]
[\useMPgraphic{alpha}]
\startreusableMPgraphic{beta}
fill unitsquare
xyscaled (\overlaywidth, \overlayheight)
withcolor (uniformdeviate 1, uniformdeviate 1, uniformdeviate 1);
\stopreusableMPgraphic
\defineoverlay
[beta]
[\reuseMPgraphic{beta}]
\startuniqueMPgraphic{gamma}
fill unitsquare
xyscaled (\overlaywidth, \overlayheight)
withcolor (uniformdeviate 1, uniformdeviate 1, uniformdeviate 1);
\stopuniqueMPgraphic
\defineoverlay
[gamma]
[\uniqueMPgraphic{gamma}]
\starttext
\dontleavehmode
\framed[background=alpha]{foo}
\framed[background=alpha]{foo}
\framed[background=alpha]{foobar}
\dontleavehmode
\framed[background=beta]{foo}
\framed[background=beta]{foo}
\framed[background=beta]{foobar}
\dontleavehmode
\framed[background=gamma]{foo}
\framed[background=gamma]{foo}
\framed[background=gamma]{foobar}
\stoptext
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