POV-Ray : Newsgroups : povray.text.scene-files : Pursuit curve (was Rainy Sunday afternoon) : Re: Pursuit curve (was Rainy Sunday afternoon) Server Time
29 May 2024 18:01:41 EDT (-0400)
  Re: Pursuit curve (was Rainy Sunday afternoon)  
From: kurtz le pirate
Date: 2 Nov 2023 11:40:09
Message: <6543c2d9$1@news.povray.org>
On 02/11/2023 12:33, William F Pokorny wrote:
> On 11/2/23 02:40, kurtz le pirate wrote:
>> Last remark. To reduce the hue between 0 and 360, I use my "mod2"
>> function, which ALWAYS returns a positive value.
>>
>> #declare mod2 = function (x,y) { select(mod(x,y),mod(x,y)+y,mod(x,y)) }
>>
>> Too many troubles with the standard mod() function ...
> 
> Thanks! I've made your updates and done a couple, hsb2rgb vs CHSV2RGB, 
> image compares. I too see the results matching perfectly.
> 
> Your mod2 function is a good candidate to make an inbuilt parser 
> function. I've already implemented an inbuilt function in my fork called 
> f_npmod which matches the internal pattern mechanism's version of:
> 
> [0, n] = {x | 0 <= x <= n}  (n == 1 always inside the pattern mechanism)
> 
> rather than mod's usual:
> 
> [0, n) = {x | 0 <= x < n}
> 
> and there is perhaps a place for a fourth form I suppose which would 
> functionally be a combination of both mod2 and f_npmod.
> 
> The color manipulation macros like hsb2rgb() - traditionally in 
> colors.inc - I see as better existing in an include called 
> color_manipulations.inc (or similar) apart from any general color 
> definitions.
> 
> The color_manipulations.inc then being a part of a separately maintained 
> 'extended includes' package for my yuqk fork. Who knows though, if I'll 
> ever get around to maintaining and shipping such a package.
> 
> Still, I've been capturing SDL code I think would be good as part of 
> such a package though - and your implementation of hsb2rgb saved aside 
> for that eventual purpose.
> 
> Bill P.
> 

Yes, a "color_manipulations.inc" is a very good idea.
You can use my code as you like.

I can code other colors conversion method found on
<https://www.rapidtables.com/convert/color/index.html>
Tell me if it's worth it...




-- 
Kurtz le pirate
Compagnie de la Banquise


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