[metapost] accessing letters in picture (for...within loop)
mailing_list at arcor.de
Tue Nov 21 13:21:06 CET 2006
Taco Hoekwater schrieb:
> Stephan Hennig wrote:
>> want to access the coordinates of single letters. Is there any way to
>> tell MetaPost to process pictures letter by letter?
> With a "Thank you!" to Hans for a behind-the-scenes answer:
> string s;
> for i=0 upto length(t)-1:
> s := substring(i,i+1) of t ;
> show s;
I might be missing the point (in fact, I've not seen Hans' answer yet).
I need to access properties of single letters such as their coordinates
in the picture, but see no way to get them using the substring operator.
The coordinates returned for t apply to the left most character's
baseline only. Since I'm using a proportional font interpolation is no
elegant solution. Any more help?
PS: Taco, would it take much to change MetaPost's behaviour in this
respect? I mean, could for...each process single characters by default?
Or what is the rationale for returning those arbitrary bunches of
letters? Since the current behaviour seems not to be documented or
explained I don't think iterating over single letters would introduce an
incompatible change. What do you think?
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