* question about MP drawing with dir
@ 2018-05-24 19:01 Pablo Rodriguez
2018-05-24 19:33 ` Hans Hagen
2018-05-24 20:23 ` Alan Braslau
0 siblings, 2 replies; 6+ messages in thread
From: Pablo Rodriguez @ 2018-05-24 19:01 UTC (permalink / raw)
To: mailing list for ConTeXt users
Dear Alan,
I have the following sample (as I wrote, this is addictive ;-)):
\startMPpage
draw fullcircle scaled (.06TextWidth - .05LineHeight);
for m=1 step 2 until 10 :
path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle)
scaled m;
n := (m * 50) ;
o := (m / 5) ;
for i=0 upto n :
draw textext("\utfchar{"EB09}")
scaled (o * .025) shifted point (i/n*length s) of s ;
endfor
endfor
\stopMPpage
dir seems magic to me. I don’t understand how it works, not even how it
can be used for drawing not having an origin.
Would it be possible that all stars are vertically centered?
How should be the path defined?
Many thanks for your help,
Pablo
--
http://www.ousia.tk
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about MP drawing with dir
2018-05-24 19:01 question about MP drawing with dir Pablo Rodriguez
@ 2018-05-24 19:33 ` Hans Hagen
2018-05-24 19:41 ` Hans Hagen
2018-05-25 17:41 ` Pablo Rodriguez
2018-05-24 20:23 ` Alan Braslau
1 sibling, 2 replies; 6+ messages in thread
From: Hans Hagen @ 2018-05-24 19:33 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 5/24/2018 9:01 PM, Pablo Rodriguez wrote:
> Dear Alan,
>
> I have the following sample (as I wrote, this is addictive ;-)):
>
> \startMPpage
> draw fullcircle scaled (.06TextWidth - .05LineHeight);
>
> for m=1 step 2 until 10 :
> path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle)
> scaled m;
> n := (m * 50) ;
> o := (m / 5) ;
> for i=0 upto n :
> draw textext("\utfchar{"EB09}")
> scaled (o * .025) shifted point (i/n*length s) of s ;
> endfor
> endfor
> \stopMPpage
reusing a picture is more efficient
\startMPpage
draw fullcircle scaled (.06TextWidth - .05LineHeight);
picture t ; t := textext("\cldcontext{utf.char(0xEB09)}") ;
for m=1 step 2 until 10 :
path s ; s := (dir30--dir150--dir315--dir90--dir225--cycle)
scaled m;
n := (m * 50) ;
o := (m / 5) ;
for i=0 upto n :
draw t scaled (o * .025) shifted point (i/n*length s) of s ;
endfor
endfor
\stopMPpage
--
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : https://bitbucket.org/phg/context-mirror/commits/
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about MP drawing with dir
2018-05-24 19:01 question about MP drawing with dir Pablo Rodriguez
2018-05-24 19:33 ` Hans Hagen
@ 2018-05-24 20:23 ` Alan Braslau
2018-05-25 17:58 ` Pablo Rodriguez
1 sibling, 1 reply; 6+ messages in thread
From: Alan Braslau @ 2018-05-24 20:23 UTC (permalink / raw)
To: Pablo Rodriguez; +Cc: mailing list for ConTeXt users
On Thu, 24 May 2018 21:01:59 +0200
Pablo Rodriguez <oinos@gmx.es> wrote:
> dir seems magic to me. I don’t understand how it works, not even how
> it can be used for drawing not having an origin.
All MP drawings have an origin (0,0).
(dir angle) returns a pair on a unit circle surrounding the origin, i.e.
(cosd angle,sind angle) where cosd is the cosine function operating on
an angle in degrees.
Alan
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: question about MP drawing with dir
2018-05-24 20:23 ` Alan Braslau
@ 2018-05-25 17:58 ` Pablo Rodriguez
0 siblings, 0 replies; 6+ messages in thread
From: Pablo Rodriguez @ 2018-05-25 17:58 UTC (permalink / raw)
To: ntg-context
On 05/24/2018 10:23 PM, Alan Braslau wrote:
> On Thu, 24 May 2018 21:01:59 +0200
> Pablo Rodriguez <oinos@gmx.es> wrote:
>
>> dir seems magic to me. I don’t understand how it works, not even how
>> it can be used for drawing not having an origin.
>
> All MP drawings have an origin (0,0).
I thought origin had to be explicitly set.
> (dir angle) returns a pair on a unit circle surrounding the origin, i.e.
> (cosd angle,sind angle) where cosd is the cosine function operating on
> an angle in degrees.
Well, I need to refresh my math from high school (centuries ago :-)) to
remember what cosine and sine are.
Many thanks for your explanation,
Pablo
--
http://www.ousia.tk
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
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2018-05-24 19:01 question about MP drawing with dir Pablo Rodriguez
2018-05-24 19:33 ` Hans Hagen
2018-05-24 19:41 ` Hans Hagen
2018-05-25 17:41 ` Pablo Rodriguez
2018-05-24 20:23 ` Alan Braslau
2018-05-25 17:58 ` Pablo Rodriguez
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