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Graechan
 Post subject: How do I break up this[solved]
PostPosted: Thu Aug 23, 2012 2:25 am  (#1) 
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I have this Gimp color '(160 150 140) and I would like to change to Red=160, Green=150 and Blue=140 so that I can use in Gmic Script. Any help would be greatly appreciated.

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Last edited by Graechan on Thu Aug 23, 2012 7:47 pm, edited 1 time in total.

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paynekj
 Post subject: Re: How do I break up this
PostPosted: Thu Aug 23, 2012 3:47 am  (#2) 
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Code: Select all
(set! Red (car '(160 150 14)))
(set! Green (cadr '(160 150 14)))
(set! Blue (caddr '(160 150 14)))


See http://www.scheme.com/tspl3/objects.html#g102

Kevin
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Graechan
 Post subject: Re: How do I break up this
PostPosted: Thu Aug 23, 2012 7:46 pm  (#3) 
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Thank you Kevin, that worked a treat. it was late last night for me and my brain had frozen (typically) :oops:

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No matter how much you push the envelope, it'll still be stationery.

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Rod
 Post subject: Re: How do I break up this[solved]
PostPosted: Thu Aug 23, 2012 9:07 pm  (#4) 
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So Red Green and Blue would be defined as a list?

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GnuTux
 Post subject: Re: How do I break up this[solved]
PostPosted: Fri Aug 24, 2012 4:19 pm  (#5) 
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In this case, Red, Green and Blue are variables that take on the values of elements in the list.

You can verify the return values in GIMP's interactive script-fu console.

Code: Select all
> (car '(160 150 14))
160
> (cadr '(160 150 14))
150
> (caddr '(160 150 14))
14

A basic linked list consists of elements which contain data and a pointer (or pointers) to the next element(s) in the list. Surprisingly, wiki has a pretty good good explanation of this data structure.

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