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You can convert a color string value to hsl. hsl is the easiest value to manipulate mathematically. The first item in an hsl color triplet is the 'hue' of a circle, in degrees (0-360), the second is the 'saturation' of the hue (0-100%), the last is 'lightness', (0-100%). Any color with a lightness of 0 is black. If the lightness is 100 it is white. You can rotate a color by changing the hue. Changing the saturation or lightness makes a color richer, paler, lighter or darker. <pre><code>(function(){ String.prototype.padZero= function(len, c){ var s= this, c= c || '0', len= len || 2; while(s.length< len) s= c+ s; return s; } window.Color= function(c){ if(!(this instanceof Color)) return new Color(c); var h= Color.getHex(c); if(h){ this.hex= h; this.rgb= Color.hexToRgb(h); this.hsl= Color.rgbToHsl(this.rgb); this.isgray= this.hsl[1]=== 0; } } var CC={ colornames:{ aqua:'#00ffff', black:'#000000', blue:'#0000ff', fuchsia:'#ff00ff', gray:'#808080', green:'#008000', lime:'#00ff00', maroon:'#800000', navy:'#000080', olive:'#808000', orange:'#ffa500', purple:'#800080', red:'#ff0000', silver:'#c0c0c0', teal:'#008080', white:'#ffffff', yellow:'#ffff00' }, getHex: function(c){ if(c instanceof Color) return c.hex; if(typeof c== 'string'){ c= c.toLowerCase(); if(/^#([a-f0-9]{3}){1,2}$/.test(c)){ if(c.length== 4){ return '#'+[c[1], c[1], c[2], c[2], c[3], c[3]].join(''); } return c; } if (/^[a-z]+$/.test(c)) return Color.colornames[c]; if(c.indexOf('hsl')== 0) c= Color.hslToRgb(c); else{ c= c.match(/\d+(\.\d+)?%?/g); if(c){ c= c.map(function(itm){ if(itm.indexOf('%')!= -1){ return Math.round(parseFloat(itm)*2.55); } return parseInt(itm); }).slice(0, 3); } } } if(c && c.length=== 3) return Color.rgbToHex(c); }, hexToRgb: function(hex){ var c= '0x'+hex.substring(1); return [(c>> 16)&255, (c>> 8)&255, c&255]; }, hslToRgb: function(hsl){ if(typeof hsl== 'string'){ hsl= hsl.match(/(\d+(\.\d+)?)/g); } var h= hsl[0]/360, s= hsl[1]/100, l= hsl[2]/100, t1, t2, t3, rgb, val; if(s== 0){ val= l*255; return [val, val, val]; } if(l < 0.5) t2= l*(1 + s); else t2= l + s - l*s; t1= 2*l - t2; rgb= [0, 0, 0]; for(var i= 0; i < 3; i++){ t3= h + 1/3*-(i - 1); t3 < 0 && t3++; t3> 1 && t3--; if(6*t3 < 1) val= t1 +(t2 - t1)*6*t3; else if(2*t3 < 1) val= t2; else if(3*t3 < 2) val= t1 +(t2 - t1)*(2/3 - t3)*6; else val= t1; rgb[i]= Math.round(val*255); } return rgb; }, rgbToHex: function(rgb){ rgb= rgb.map(function(c){ c= (Math.round(+c).minmax(0, 255)); return c.toString(16).padZero(2); }); return '#'+rgb.join('').toLowerCase(); }, rgbToHsl: function(c){ var r= c[0]/255, g= c[1]/255, b= c[2]/255, min= Math.min(r, g, b), max= Math.max(r, g, b), d= max - min, h, s, l; if(max== min) h= 0; else if(r== max) h= (g - b)/d; else if(g== max) h= 2 +(b - r)/d; else if(b== max) h= 4 +(r - g)/d; h= Math.min(h*60, 360); if(h < 0) h += 360; l= (min + max)/2; if(max== min) s= 0; else if(l <= 0.5) s= d/(max + min); else s= d/(2 - max - min); return [Math.round(h), Math.round(s*100), Math.floor(l*100)]; } } var CP={ getName: function(){ var C= Color.colornames, hex= this.hex; for(var p in C) if(C[p]=== hex) return p; return ''; }, rotate: function(d){ if(typeof d!= 'number') d= 180; var C= this.hsl.slice(0); d+= C[0]; C[0]= Math.abs(d%360); return Color(Color.hslToRgb(C)); }, shade: function(s, v){ var C= this.hsl.slice(0); if(typeof s== 'number') C[1]= s.minmax(0, 100); if(typeof v== 'number') C[2]= v.minmax(0, 100); return Color(Color.hslToRgb(C)); }, toHsl: function(c){ c= c || this.hsl; return 'hsl('+c[0]+','+c[1]+'%,'+c[2]+'%)'; }, toRgb: function(){ return 'rgb('+this.rgb.join(',')+')'; } } for(var p in CC) Color[p]= CC[p]; for(var p in CP) Color.prototype[p]= CP[p]; Color.prototype.toString= function(){ return this.hex; } })(); </code></pre> sample code- <pre><code>var C= [], hue= Color('red'); while(C.length<6){ C.push((hue.getName() || hue.hex)+'='+hue.hsl); hue= hue.rotate(60); } C.join('\n') returns: red=0,100,50 yellow=60,100,50 lime=120,100,50 aqua=180,100,50 blue=240,100,50 fuchsia=300,100,50 </code></pre> you can use other color string values- Color('rgb(255,0,0)'), or Color('#ff0000') or Color('hsl(0,100%,50%)');
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1. This table or related slice is empty.
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1. POJavascript: generate random nice saturated colors (selected palette)
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1. PTAnswer
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1. USkennebec
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