Re: [NTG-context] How to define an array of pens

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 wrote:

...

On 22 Jun 2020, at 09:17, Otared Kavian 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

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