[NTG-context] Re: Help with Metapopst code

28 Aug 2024

      I think it works like (0, r) rotated (a) -- (0, r) rotated (a * 2) --
... (0, r) rotated (a*20) -- cycle

Is my understanding correct? Also, how can I label these vertices in a for loop?

On Wed, Aug 28, 2024 at 2:25 PM Shiv Shankar Dayal
 wrote:
...
Hi,
Consider following code:
vardef polygon_with_side(expr n, s) =
save a, b, r; numeric a, b, r;
a * n = 360; a + 2b = 180; r = s * sind(b) / sind(a);
for i = 0 upto n-1: (0, r) rotated (a * i) -- endfor cycle
enddef;
beginfig(1);
path p; p = polygon_with_side(21, 20);
draw p;
endfig;
bye;
It draws a polygon with 21 sides with radius 20. I understand all of
it except the for loop.
What is (0, r) rotated (a *i) doing?
--
Respect,
Shiv Shankar Dayal
-- 
Respect,
Shiv Shankar Dayal