xpansive/LICENSE.txt

## README.md

      
    Raw
  

              README.md
            
          
    HSV←→HSL

Converts back and forth between HSV and HSL.
I find it strange that they appear to be completely different, there's probably something I'm missing that will bring hsv2hsl down to the size of hsl2hsv.
Also see:
hsl2rgb
hsv2rgb

  
## annotated.js
function hsv2hsl(hue,sat,val){
    return[ //[hue, saturation, lightness]
            //Range should be between 0 - 1
        hue, //Hue stays the same

        //Saturation is very different between the two color spaces
        //If (2-sat)*val < 1 set it to sat*val/((2-sat)*val)
        //Otherwise sat*val/(2-(2-sat)*val)
        //Conditional is not operating with hue, it is reassigned!
        sat*val/((hue=(2-sat)*val)<1?hue:2-hue),

        hue/2 //Lightness is (2-sat)*val/2
        //See reassignment of hue above
    ]
}

hsl2hsv=function(hue,sat,light){
    sat*=light<.5?light:1-light;

    return[ //[hue, saturation, value]
    //Range should be between 0 - 1

        hue, //Hue stays the same
        2*sat/(light+sat), //Saturation
        light+sat //Value
    ]
}

## index.js
function hsv2hsl(a,b,c){return[a,b*c/((a=(2-b)*c)<1?a:2-a),a/2]}
function hsl2hsv(a,b,c){b*=c<.5?c:1-c;return[a,2*b/(c+b),c+b]}

## LICENSE.txt
            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

  0. You just DO WHAT THE FUCK YOU WANT TO.

## package.json
{
  "name": "HSVHSLConverter",

  "description": "Converts back and forth between HSV and HSL.",

  "keywords": [
    "color",
    "hsl"
    "hsv"
  ]
}

## test.html
<!DOCTYPE html>
<title>HSV/HSL Converter</title>
<div>hsv2hsl Expected value: <b><br/>(0,1,0.5)<br/>(300,0.5,0.5)<br/>(14.3,0.817,0.624)</b></div><br/>
<div>hsv2hsl Actual value: <b id="ret"></b></div><br/>
<div>hsl2hsv Expected value: <b><br/>(0,1,1)<br/>(300,0.66667,0.75)<br/>(14.3,0.661,0.931)</b></div><br/>
<div>hsl2hsv Actual value: <b id="ret2"></b></div>
<script>
  function hsv2hsl(a,b,c){return[a,b*c/((a=(2-b)*c)<1?a:2-a),a/2]}
  function hsl2hsv(a,b,c){b*=c<.5?c:1-c;return[a,2*b/(c+b),c+b]}

  //These are three random colors from the wikipedia page on HSL and HSV.
  //http://en.wikipedia.org/wiki/HSL_and_HSV#Examples
  out = "<br/>(" + (c1 = hsv2hsl(0, 1, 1)) + ")<br/>";
  out += "(" + (c2 = hsv2hsl(300, 0.66667, 0.75)) + ")<br/>";
  out += "(" + (c3 = hsv2hsl(14.3, 0.661, 0.931)) + ")<br/>";

  document.getElementById( "ret" ).innerHTML = out;

  out = "<br/>(" + hsl2hsv(c1[0], c1[1], c1[2])+ ")<br/>";
  out += "(" + hsl2hsv(c2[0], c2[1], c2[2]) + ")<br/>";
  out += "(" + hsl2hsv(c3[0], c3[1], c3[2]) + ")<br/>";

    document.getElementById( "ret2" ).innerHTML = out;
</script>
	function hsv2hsl(hue,sat,val){
	return[ //[hue, saturation, lightness]
	//Range should be between 0 - 1
	hue, //Hue stays the same

	//Saturation is very different between the two color spaces
	//If (2-sat)val < 1 set it to satval/((2-sat)*val)
	//Otherwise satval/(2-(2-sat)val)
	//Conditional is not operating with hue, it is reassigned!
	satval/((hue=(2-sat)val)<1?hue:2-hue),

	hue/2 //Lightness is (2-sat)*val/2
	//See reassignment of hue above
	]
	}

	hsl2hsv=function(hue,sat,light){
	sat*=light<.5?light:1-light;

	return[ //[hue, saturation, value]
	//Range should be between 0 - 1

	hue, //Hue stays the same
	2*sat/(light+sat), //Saturation
	light+sat //Value
	]
	}
	function hsv2hsl(a,b,c){return[a,bc/((a=(2-b)c)<1?a:2-a),a/2]}
	function hsl2hsv(a,b,c){b=c<.5?c:1-c;return[a,2b/(c+b),c+b]}
	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	Version 2, December 2004

	Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>

	Everyone is permitted to copy and distribute verbatim or modified
	copies of this license document, and changing it is allowed as long
	as the name is changed.

	DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
	TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

	0. You just DO WHAT THE FUCK YOU WANT TO.
	{
	"name": "HSVHSLConverter",

	"description": "Converts back and forth between HSV and HSL.",

	"keywords": [
	"color",
	"hsl"
	"hsv"
	]
	}
	<!DOCTYPE html>
	<title>HSV/HSL Converter</title>
	<div>hsv2hsl Expected value: <b><br/>(0,1,0.5)<br/>(300,0.5,0.5)<br/>(14.3,0.817,0.624)</b></div><br/>
	<div>hsv2hsl Actual value: <b id="ret"></b></div><br/>
	<div>hsl2hsv Expected value: <b><br/>(0,1,1)<br/>(300,0.66667,0.75)<br/>(14.3,0.661,0.931)</b></div><br/>
	<div>hsl2hsv Actual value: <b id="ret2"></b></div>
	<script>
	function hsv2hsl(a,b,c){return[a,bc/((a=(2-b)c)<1?a:2-a),a/2]}
	function hsl2hsv(a,b,c){b=c<.5?c:1-c;return[a,2b/(c+b),c+b]}

	//These are three random colors from the wikipedia page on HSL and HSV.
	//http://en.wikipedia.org/wiki/HSL_and_HSV#Examples
	out = "<br/>(" + (c1 = hsv2hsl(0, 1, 1)) + ")<br/>";
	out += "(" + (c2 = hsv2hsl(300, 0.66667, 0.75)) + ")<br/>";
	out += "(" + (c3 = hsv2hsl(14.3, 0.661, 0.931)) + ")<br/>";

	document.getElementById( "ret" ).innerHTML = out;

	out = "<br/>(" + hsl2hsv(c1[0], c1[1], c1[2])+ ")<br/>";
	out += "(" + hsl2hsv(c2[0], c2[1], c2[2]) + ")<br/>";
	out += "(" + hsl2hsv(c3[0], c3[1], c3[2]) + ")<br/>";

	document.getElementById( "ret2" ).innerHTML = out;
	</script>