Hi, I don't know where you found the code, but the answer to "What is (0, r) rotated (a *i) doing?" is that it takes the point (0,r) and rotates it a*i degrees.
For your labeling problem, see the last example of section 2.9 of https://www.pragma-ade.com/general/manuals/metafun-p.pdf /Mikael PS Please do not cross post here and on stackexchange (at least not without telling). On Wed, Aug 28, 2024 at 11:12 AM Shiv Shankar Dayal <shivshankar.da...@gmail.com> wrote: > > 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 > <shivshankar.da...@gmail.com> 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 > ___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / > https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl > webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) > archive : https://github.com/contextgarden/context > wiki : https://wiki.contextgarden.net > ___________________________________________________________________________________ ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl webpage : https://www.pragma-ade.nl / https://context.aanhet.net (mirror) archive : https://github.com/contextgarden/context wiki : https://wiki.contextgarden.net ___________________________________________________________________________________
