*[NTG-context] Help with Metapopst code@ 2024-08-28 8:55 Shiv Shankar Dayal2024-08-28 9:02 ` [NTG-context] " Shiv Shankar Dayal 0 siblings, 1 reply; 6+ messages in thread From: Shiv Shankar Dayal @ 2024-08-28 8:55 UTC (permalink / raw) To: mailing list for ConTeXt users 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 ___________________________________________________________________________________ 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

*[NTG-context] Re: Help with Metapopst code2024-08-28 8:55 [NTG-context] Help with Metapopst code Shiv Shankar Dayal@ 2024-08-28 9:02 ` Shiv Shankar Dayal2024-08-28 10:16 ` Mikael Sundqvist 0 siblings, 1 reply; 6+ messages in thread From: Shiv Shankar Dayal @ 2024-08-28 9:02 UTC (permalink / raw) To: mailing list for ConTeXt users 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.dayal@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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

*[NTG-context] Re: Help with Metapopst code2024-08-28 9:02 ` [NTG-context] " Shiv Shankar Dayal@ 2024-08-28 10:16 ` Mikael Sundqvist2024-08-28 10:23 ` Shiv Shankar Dayal 0 siblings, 1 reply; 6+ messages in thread From: Mikael Sundqvist @ 2024-08-28 10:16 UTC (permalink / raw) To: mailing list for ConTeXt users 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.dayal@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.dayal@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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

*[NTG-context] Re: Help with Metapopst code2024-08-28 10:16 ` Mikael Sundqvist@ 2024-08-28 10:23 ` Shiv Shankar Dayal2024-08-28 10:34 ` Wolfgang Schuster 2024-08-28 10:37 ` Mikael Sundqvist 0 siblings, 2 replies; 6+ messages in thread From: Shiv Shankar Dayal @ 2024-08-28 10:23 UTC (permalink / raw) To: mailing list for ConTeXt users > 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. I do not understand the concept of rotating a point. It is rotated with respect to what reference? > > For your labeling problem, see the last example of section 2.9 of > > https://www.pragma-ade.com/general/manuals/metafun-p.pdf > Thanks, I am reading that. > /Mikael > > PS Please do not cross post here and on stackexchange (at least not > without telling). > I will keep this in mind. -- 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

*[NTG-context] Re: Help with Metapopst code2024-08-28 10:23 ` Shiv Shankar Dayal@ 2024-08-28 10:34 ` Wolfgang Schuster2024-08-28 10:37 ` Mikael Sundqvist 1 sibling, 0 replies; 6+ messages in thread From: Wolfgang Schuster @ 2024-08-28 10:34 UTC (permalink / raw) To: mailing list for ConTeXt users, Shiv Shankar Dayal Shiv Shankar Dayal schrieb am 28.08.2024 um 12:23: >> 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. > > I do not understand the concept of rotating a point. It is rotated with respect > to what reference? You rotate around a point with the x and y coordinates 0. The blue dot shows the point with the coordinates 0. The green dot is rotated around this point. \starttext \startMPcode drawdot (0,0) withpen pencircle scaled 5mm withcolor blue; draw fullsquare scaled (4cm) withcolor red; \stopMPcode \startMPcode drawdot (0,0) withpen pencircle scaled 5mm withcolor blue; drawdot (1.5cm,0) withpen pencircle scaled 5mm withcolor green; draw fullsquare scaled (4cm) withcolor red; \stopMPcode \startMPcode drawdot (0,0) withpen pencircle scaled 5mm withcolor blue; drawdot (1.5cm,0) rotated (30) withpen pencircle scaled 5mm withcolor green; draw fullsquare scaled (4cm) withcolor red; \stopMPcode \startMPcode drawdot (0,0) withpen pencircle scaled 5mm withcolor blue; drawdot (1.5cm,0) rotated (60) withpen pencircle scaled 5mm withcolor green; draw fullsquare scaled (4cm) withcolor red; \stopMPcode \startMPcode drawdot (0,0) withpen pencircle scaled 5mm withcolor blue; drawdot (1.5cm,0) rotated (90) withpen pencircle scaled 5mm withcolor green; draw fullsquare scaled (4cm) withcolor red; \stopMPcode \stoptext Wolfgang ___________________________________________________________________________________ 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

*2024-08-28 10:23 ` Shiv Shankar Dayal 2024-08-28 10:34 ` Wolfgang Schuster[NTG-context] Re: Help with Metapopst code@ 2024-08-28 10:37 ` Mikael Sundqvist1 sibling, 0 replies; 6+ messages in thread From: Mikael Sundqvist @ 2024-08-28 10:37 UTC (permalink / raw) To: mailing list for ConTeXt users It is rotated with respect to the origin (that is (0,0)). If you want to rotate around another point you have rotatedaround. /Mikael On Wed, Aug 28, 2024 at 12:27 PM Shiv Shankar Dayal <shivshankar.dayal@gmail.com> wrote: > > > 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. > > I do not understand the concept of rotating a point. It is rotated with respect > to what reference? > > > > > For your labeling problem, see the last example of section 2.9 of > > > > https://www.pragma-ade.com/general/manuals/metafun-p.pdf > > > > Thanks, I am reading that. > > > /Mikael > > > > PS Please do not cross post here and on stackexchange (at least not > > without telling). > > > > I will keep this in mind. > > -- > 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 ___________________________________________________________________________________ ^ permalink raw reply [flat|nested] 6+ messages in thread

end of thread, other threads:[~2024-08-28 10:39 UTC | newest]Thread overview:6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2024-08-28 8:55 [NTG-context] Help with Metapopst code Shiv Shankar Dayal 2024-08-28 9:02 ` [NTG-context] " Shiv Shankar Dayal 2024-08-28 10:16 ` Mikael Sundqvist 2024-08-28 10:23 ` Shiv Shankar Dayal 2024-08-28 10:34 ` Wolfgang Schuster 2024-08-28 10:37 ` Mikael Sundqvist

This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for NNTP newsgroup(s).