[metapost] (newbie) macro with a sequence of pairs

[luigi scarso]

On Tue, Dec 15, 2009 at 9:03 AM, Taco Hoekwater <taco at elvenkind.com> wrote:
> luigi scarso wrote:
>>
>> I'm pretty new about metapost programming
>> and I need to write a "polyline" macro
>> that take a with a "sequence of pairs"  like
>> (0,0) (10,10) (30,10)
>> and draw  a line
>> ie
>> polyline (0,0) (10,10) (30,10)
>> is
>> draw (0,0)--(10,10)--(30,30)
>>
>>  Is it possible ?
>
> Not without a lot of trickery, I think. Why do you
> not want to use
>
>  polyline (0,0)--(10,10)--(30,30);

I can't .

Some one suggests me to look into  string.mp,
macro loptok .

(given that I'm on luatex,
it's not a big problem to write a macro; but I would like to know if
it's doable only in mpost).


-- 
luigi