On 4/9/2020 11:01 AM, Taco Hoekwater wrote:
Hi,
Using multiple (text <x>) arguments in macros doesn’t work, you would
need to convert all but the last argument into (expr <x>) somehow.
That means that you probably cannot do a call like the one below at all.
(I, at least, do not see how you could convert one of those transparent
colours into an expr <x> argument)
SampleText ("Much Of This", transparent(1, .5, red ) , transparent(1, .5,
green )) ;
The situation may get even trickier because withtransparency() and
transparent() both use a (text <x>) argument internally as well,
and I am not quite sure why.
At this point, I think you may need Hans for advice, sorry.
Taco is right (of course). Indeed, one can end up in conflicts (mp has
no transparency so it's all implemented using trickery). Anyway, using
'infont' has no real benefits as it maps onto textext, so one can just
use that one (also because it supports the anchoring suffixes which
saves you the shift):
\starttext
\startMPpage[instance=doublefun]
draw textext("more recent" ) withcolor red withtransparency
(1, .5) ;
draw textext("functionality" ) withcolor green withtransparency
(1, .5) ;
draw textext("was written" ) withcolor blue withtransparency
(1, .5) ;
draw textext("while listening" ) withcolor magenta withtransparency
(1, .5) ;
draw textext("to superb covers by") withcolor cyan withtransparency
(1, .5) ;
draw textext("Alyona Yarushina" ) withcolor yellow withtransparency
(1, .5) ;
\stopMPpage
\stoptext
If something like "withcolor ... " is passed to a macro it has to be a
text argument, not an expression (the transparent macro actually passed
some abstraction); also, when making vardef's one need to omit the final
semi colon in order to apply more properties to the 'return value'.
At some point I will update the metafun manual which means: remove old
methods and exclusively use the new ones (currently the manual also
discusses mpii while in context mkiv/lmtx we use mpiv macros).
For instance, when using colors one can best use named colors as these
are consistent with the tex end, so often
withcolor "red"
is better than
withcolor red
etc etc etc etc
Hans
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Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
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