* How to define an array of pens
@ 2020-06-22 7:17 Otared Kavian
2020-06-22 7:28 ` Taco Hoekwater
2020-06-22 14:32 ` Alan Braslau
0 siblings, 2 replies; 4+ messages in thread
From: Otared Kavian @ 2020-06-22 7:17 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi Hans,
After learning from you how to define an array of colors and paths, I would like to know how is it possible to define a variable pen size.
In the following working example below, I would like to replace
MyPens[j] := pencircle scaled 2pt ;
by something like
MyPens[j] := pencircle scaled (2+j) pt ;
but this does not work (neither do (2+j)*pt).
Is it possible to specify the pen size according to the value of j, without using a structure like
if j == -1 :
MyPens[j] := pencircle scaled 1pt ;
elseif j == 0 :
MyPens[j] := pencircle scaled 2pt ;
else :
MyPens[j] := pencircle scaled 3pt ;
fi
(In my real example I have more than three values for j).
%% begin example-array.tex
\startMPpage
string MyColors[] ;
path MyPaths [] ;
pen MyPens[] ;
for j = -1 step 1 until 1 :
MyPens[j] := pencircle scaled 2pt ; % I would like to say here (2+j) pt
endfor
MyPaths[-1] := (-1.5cm,1.5cm) -- (1.5cm,1.5cm) ; MyColors[-1] := "magenta" ;
MyPaths[0] := (-2cm,2cm) -- (2cm,-2cm) ; MyColors[0] := "darkyellow" ;
MyPaths[1] := fullcircle scaled 3cm ; MyColors[1] := "darkred" ;
for j = -1 step 1 until 1 :
draw MyPaths[j] withpen MyPens[j] withcolor MyColors[j] ;
endfor
\stopMPpage
%% end example-array.tex
Best regards: Otared
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: How to define an array of pens
2020-06-22 7:17 How to define an array of pens Otared Kavian
@ 2020-06-22 7:28 ` Taco Hoekwater
2020-06-22 9:23 ` Otared Kavian
2020-06-22 14:32 ` Alan Braslau
1 sibling, 1 reply; 4+ messages in thread
From: Taco Hoekwater @ 2020-06-22 7:28 UTC (permalink / raw)
To: mailing list for ConTeXt users
> On 22 Jun 2020, at 09:17, Otared Kavian <otared@gmail.com> wrote:
>
> Hi Hans,
>
> After learning from you how to define an array of colors and paths, I would like to know how is it possible to define a variable pen size.
> In the following working example below, I would like to replace
>
> MyPens[j] := pencircle scaled 2pt ;
>
> by something like
>
> MyPens[j] := pencircle scaled (2+j) pt ;
MyPens[j] := pencircle scaled ((2+j)*pt);
“pt” is just a multiplier variable in MetaPost. there is an
implied multiplication operation, but that only works in
bare-number cases. That is why you need
(2+j)*pt
The outer parentheses are to prevent MetaPost from interpreting
your line as
(pencircle scaled (2+j)) * pt;
Best wishes,
Taco
___________________________________________________________________________________
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] 4+ messages in thread
* Re: How to define an array of pens
2020-06-22 7:28 ` Taco Hoekwater
@ 2020-06-22 9:23 ` Otared Kavian
0 siblings, 0 replies; 4+ messages in thread
From: Otared Kavian @ 2020-06-22 9:23 UTC (permalink / raw)
To: mailing list for ConTeXt users
Thanks Taco!
I added this and Hans' explanations to the wiki:
https://wiki.contextgarden.net/variable_color
but could not set a better title for that page such as « Variable arrays of colors, pens, paths ».
Best regards: Otared
> On 22 Jun 2020, at 09:28, Taco Hoekwater <taco@elvenkind.com> wrote:
>
>
>
>> On 22 Jun 2020, at 09:17, Otared Kavian <otared@gmail.com> wrote:
>>
>> Hi Hans,
>>
>> After learning from you how to define an array of colors and paths, I would like to know how is it possible to define a variable pen size.
>> In the following working example below, I would like to replace
>>
>> MyPens[j] := pencircle scaled 2pt ;
>>
>> by something like
>>
>> MyPens[j] := pencircle scaled (2+j) pt ;
>
> MyPens[j] := pencircle scaled ((2+j)*pt);
>
> “pt” is just a multiplier variable in MetaPost. there is an
> implied multiplication operation, but that only works in
> bare-number cases. That is why you need
>
> (2+j)*pt
>
> The outer parentheses are to prevent MetaPost from interpreting
> your line as
>
> (pencircle scaled (2+j)) * pt;
>
> Best wishes,
> Taco
>
>
> ___________________________________________________________________________________
> 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
> ___________________________________________________________________________________
___________________________________________________________________________________
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] 4+ messages in thread
* Re: How to define an array of pens
2020-06-22 7:17 How to define an array of pens Otared Kavian
2020-06-22 7:28 ` Taco Hoekwater
@ 2020-06-22 14:32 ` Alan Braslau
1 sibling, 0 replies; 4+ messages in thread
From: Alan Braslau @ 2020-06-22 14:32 UTC (permalink / raw)
To: mailing list for ConTeXt users, Otared Kavian
On 22/06/20 01:17, Otared Kavian wrote:
> for j = -1 step 1 until 1 :
> MyPens[j] := pencircle scaled 2pt ; % I would like to say here (2+j) pt
> endfor
MyPens[j] := pencircle scaled (2+j)*pt ;
pt is just a variable, and one can write 2pt implicitly implying the
multiplication, but must explicitly write (2+j)*pt to parse correctly.
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
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] 4+ messages in thread
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2020-06-22 7:17 How to define an array of pens Otared Kavian
2020-06-22 7:28 ` Taco Hoekwater
2020-06-22 9:23 ` Otared Kavian
2020-06-22 14:32 ` Alan Braslau
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