Added color stepping functions

src/vendor/chromath.js

+(function(){function a(d){var c,b,e,f;if("[object String]"===Object.prototype.toString.call(d)||"[object Number]"===Object.prototype.toString.call(d))c=a.parse(d);else{if(m(d))throw Error("Unsure how to parse array `"+d+"`, please pass an object or CSS style or try Chromath.rgb, Chromath.hsl, or Chromath.hsv");d instanceof a?c=k({},d):n(d)&&(c=k({},d))}if(c)isFinite(c.a)||(c.a=1);else throw Error("Could not parse `"+d+"`");if("r"in c)f=[c.r,c.g,c.b],b=a.rgb2hsl(f),e=a.rgb2hsv(f);else if("h"in c)if("l"in
+c)b=[c.h,c.s,c.l],f=a.hsl2rgb(b),e=a.rgb2hsv(f);else if("v"in c||"b"in c)"b"in c&&(c.v=c.b),e=[c.h,c.s,c.v],f=a.hsv2rgb(e),b=a.rgb2hsl(f);k(this,{r:f[0],g:f[1],b:f[2],h:b[0],sl:b[1],l:b[2],sv:e[1],v:e[2],a:c.a});this.h=(this.h%360+360)%360;1<this.sl&&(this.sl/=100);1<this.sv&&(this.sv/=100);1<this.l&&(this.l/=100);this.r=h(parseInt(this.r,10),0,255);this.g=h(parseInt(this.g,10),0,255);this.b=h(parseInt(this.b,10),0,255);this.a=h(this.a,0,1);return this}function q(d,a,b,e){var f=d;m(f)&&(d=f[0],a=
+f[1],b=f[2],e=f[3]);n(f)&&(d=f.r,a=f.g,b=f.b,e=f.a);return[d,a,b,e]}function p(d,a,b,e){var f=d;m(f)&&(d=f[0],a=f[1],b=f[2],e=f[3]);n(f)&&(d=f.h,a=f.s,b=f.l||f.v,e=f.a);return[d,a,b,e]}function r(a,c,b){isFinite(c)||(b=q(a,c,b),a=b[0],c=b[1],b=b[2]);1<a&&(a/=255);1<c&&(c/=255);1<b&&(b/=255);return[a,c,b]}function s(a,c,b){isFinite(c)||(b=p(a,c,b),a=b[0],c=b[1],b=b[2]);1<c&&(c/=100);1<b&&(b/=100);return[(a%360+360)%360,c,b]}function k(){for(var a=arguments[0],c=1,b,e;b=arguments[c++];)for(e in b)a[e]=
+b[e];return a}function m(a){return"[object Array]"===Object.prototype.toString.call(a)}function n(a){return"[object Object]"===Object.prototype.toString.call(a)}function h(a,c,b){return a>b?b:a<c?c:a}function l(a,c,b){return a+(c-a)*b}a.rgb=function(d,c,b,e){e=q(d,c,b,e);d=e[0];c=e[1];b=e[2];e=e[3];return new a({r:d,g:c,b:b,a:e})};a.rgba=a.rgb;a.hsl=function(d,c,b,e){e=p(d,c,b,e);d=e[0];c=e[1];b=e[2];e=e[3];return new a({h:d,s:c,l:b,a:e})};a.hsla=a.hsl;a.hsv=function(d,c,b,e){e=p(d,c,b,e);d=e[0];
+c=e[1];b=e[2];e=e[3];return new a({h:d,s:c,v:b,a:e})};a.hsva=a.hsv;a.hsb=a.hsv;a.hsba=a.hsva;a.toInteger=function(d){d=(new a(d)).toRGBObject();return d.b|d.g<<8|d.r<<16};a.toName=function(d){var d=+new a(d),c;for(c in a.colors)if(+a[c]==d)return c};a.rgb2hex=function(d,c,b){d=a.toInteger({r:d,g:c,b:b}).toString(16).toUpperCase();c=6;b=0;d=d.toString();c||(c=2);for(b||(b="0");d.length<c;)d=b+d;return"#"+d};a.rgb2hsl=function(a,c,b){var b=r(a,c,b),a=b[0],c=b[1],b=b[2],e=Math.max(a,c,b),f=Math.min(a,
+c,b),g=e-f,f=0.5*(e+f),h=0===g?0:g/(1-Math.abs(2*f-1)),i;0===g?i=0:e===a?i=(c-b)/g%6:e===c?i=(b-a)/g+2:e===b&&(i=(a-c)/g+4);return[60*i,parseFloat(h),parseFloat(f)]};a.rgb2hsv=function(a,c,b){var b=r(a,c,b),a=b[0],c=b[1],b=b[2],e=Math.max(a,c,b),f=Math.min(a,c,b),f=e-f,g;0===f?g=0:e===a?g=(c-b)/f%6:e===c?g=(b-a)/f+2:e===b&&(g=(a-c)/f+4);return[60*g,parseFloat(0===f?0:f/e),parseFloat(e)]};a.rgb2hsb=a.rgb2hsv;a.hsl2rgb=function(a,c,b){var b=s(a,c,b),a=b[0],c=b[1],b=b[2],c=(1-Math.abs(2*b-1))*c,a=a/
+60,e=c*(1-Math.abs(a%2-1));switch(Math.floor(a)){case 0:a=[c,e,0];break;case 1:a=[e,c,0];break;case 2:a=[0,c,e];break;case 3:a=[0,e,c];break;case 4:a=[e,0,c];break;case 5:a=[c,0,e];break;default:a=[0,0,0]}b-=c/2;return[255*(a[0]+b),255*(a[1]+b),255*(a[2]+b)]};a.hsv2rgb=function(a,c,b){var b=s(a,c,b),a=b[0],c=b[1],b=b[2],c=b*c,e=a/60,f=c*(1-Math.abs(e%2-1)),g;void 0==a?g=[0,0,0]:0<=e&&1>e?g=[c,f,0]:1<=e&&2>e?g=[f,c,0]:2<=e&&3>e?g=[0,c,f]:3<=e&&4>e?g=[0,f,c]:4<=e&&5>e?g=[f,0,c]:5<=e&&6>e&&(g=[c,0,f]);
+a=b-c;return[255*(g[0]+a),255*(g[1]+a),255*(g[2]+a)]};a.hsb2rgb=a.hsv2rgb;a.complement=function(d){d=(new a(d)).toHSLObject();d.h=(d.h+180)%360;return new a(d)};a.triad=function(d){d=new a(d);return[d,new a({r:d.b,g:d.r,b:d.g}),new a({r:d.g,g:d.b,b:d.r})]};a.tetrad=function(d){d=new a(d);return[d,new a({r:d.b,g:d.r,b:d.b}),new a({r:d.b,g:d.g,b:d.r}),new a({r:d.r,g:d.b,b:d.r})]};a.analogous=function(d,c,b){isFinite(c)||(c=8);isFinite(b)||(b=30);var e=new a(d),d=e.toHSVObject(),b=360/b,e=[e];for(d.h=
+(d.h-(b*c>>1)+720)%360;--c;)d.h+=b,d.h%=360,e.push(new a(d));return e};a.monochromatic=function(d,c){c||(c=5);for(var b=(new a(d)).toHSVObject(),e=1/c,f=[],g=0;g++<c;)b.v=g*e,f.push(new a(b));return f};a.splitcomplement=function(d){var c=new a(d),d=c.toHSVObject(),c=[c];d.h*=0.2;d.h%=360;c.push(new a(d));d.h*=0.4;d.h%=360;c.push(new a(d));return c};a.tint=function(d,c){return a.towards(d,"#FFFFFF",c)};a.lighten=a.tint;a.shade=function(d,c){return a.towards(d,"#000000",c)};a.darken=a.shade;a.desaturate=
+function(d,c){var b=new a(d);switch(c){case 1:b=0.35+13*(b.r+b.g+b.b)/60;break;case 2:b=(13*(b.r+b.g+b.b)+5355)/60;break;default:b=0.3*b.r+0.59*b.g+0.11*b.b}b=h(b,0,255);return new a({r:b,g:b,b:b})};a.greyscale=a.desaturate;a.websafe=function(d){d=new a(d);d.r=51*Math.round(d.r/51);d.g=51*Math.round(d.g/51);d.b=51*Math.round(d.b/51);return new a(d)};a.additive=function(){for(var d=arguments.length-2,c=-1,b,e;c++<d;){b=b||new a(arguments[c]);e=new a(arguments[c+1]);if(255<(b.r+=e.r))b.r=255;if(255<
+(b.g+=e.g))b.g=255;if(255<(b.b+=e.b))b.b=255;b=new a(b)}return b};a.subtractive=function(){for(var d=arguments.length-2,c=-1,b,e;c++<d;){b=b||new a(arguments[c]);e=new a(arguments[c+1]);if(0>(b.r+=e.r-255))b.r=0;if(0>(b.g+=e.g-255))b.g=0;if(0>(b.b+=e.b-255))b.b=0;b=new a(b)}return b};a.multiply=function(){for(var d=arguments.length-2,c=-1,b,e;c++<d;)b=b||new a(arguments[c]),e=new a(arguments[c+1]),b.r=b.r/255*e.r|0,b.g=b.g/255*e.g|0,b.b=b.b/255*e.b|0,b=new a(b);return b};a.average=function(){for(var d=
+arguments.length-2,c=-1,b,e;c++<d;)b=b||new a(arguments[c]),e=new a(arguments[c+1]),b.r=b.r+e.r>>1,b.g=b.g+e.g>>1,b.b=b.b+e.b>>1,b=new a(b);return b};a.overlay=function(d,c,b){d=new a(d);c=new a(c);1<b&&(b/=100);b=h(b-1+c.a,0,1);return new a({r:l(d.r,c.r,b),g:l(d.g,c.g,b),b:l(d.b,c.b,b)})};a.towards=function(d,c,b,e){if(!c)return d;if(!isFinite(b))throw Error("TypeError: `by`("+b+") should be between 0 and 1");d instanceof a||(d=new a(d));c instanceof a||(c=new a(c||"#FFFFFF"));e||(e=l);b=parseFloat(b);
+return new a({r:e(d.r,c.r,b),g:e(d.g,c.g,b),b:e(d.b,c.b,b),a:e(d.a,c.a,b)})};a.gradient=function(d,c,b,e){var f=[],g;b||(b=20);g=b-1;if(isFinite(e))return a.towards(d,c,e/g);for(e=-1;++e<b;)f.push(a.towards(d,c,e/g));return f};a.parse=function(d){var c=a.parsers,b,e,f,g,h;b=0;for(e=c.length;b<e;b++)if(f=c[b],(g=f.regex.exec(d))&&g.length&&(h=f.process.apply(this,g)),h)return h};a.parsers=[{example:["red","burlywood"],regex:/^[a-z]+$/i,process:function(d){if(a.colors[d])return a.colors[d]}},{example:[3554431,
+16809984],regex:/^\d+$/,process:function(a){return{r:a>>16&255,g:a>>8&255,b:a&255}}},{example:["#fb0","f0f"],regex:/^#?([\dA-F]{1})([\dA-F]{1})([\dA-F]{1})$/i,process:function(a,c,b,e){return{r:parseInt(c+c,16),g:parseInt(b+b,16),b:parseInt(e+e,16)}}},{example:["#00ff00","336699"],regex:/^#?([\dA-F]{2})([\dA-F]{2})([\dA-F]{2})$/i,process:function(a,c,b,e){return{r:parseInt(c,16),g:parseInt(b,16),b:parseInt(e,16)}}},{example:["rgb(123, 234, 45)","rgb(25, 50%, 100%)","rgba(12%, 34, 56%, 0.78)"],regex:/^rgba*\((\d{1,3}\%*),\s*(\d{1,3}\%*),\s*(\d{1,3}\%*)(?:,\s*([0-9.]+))?\)/,
+process:function(a,c,b,e,f){c=c&&"%"==c.slice(-1)?Math.round(2.55*c.slice(0,-1)):1*c;b=b&&"%"==b.slice(-1)?Math.round(2.55*b.slice(0,-1)):1*b;e=e&&"%"==e.slice(-1)?Math.round(2.55*e.slice(0,-1)):1*e;f=f&&"%"==f.slice(-1)?Math.round(100*f.slice(0,-1)):1*f;return{r:h(c,0,255),g:h(b,0,255),b:h(e,0,255),a:h(f,0,1)||void 0}}},{example:["hsl(123, 34%, 45%)","hsla(25, 50%, 100%, 0.75)","hsv(12, 34%, 56%)"],regex:/^hs([bvl])a*\((\d{1,3}\%*),\s*(\d{1,3}\%*),\s*(\d{1,3}\%*)(?:,\s*([0-9.]+))?\)/,process:function(a,
+c,b,e,f){b*=1;e=e.slice(0,-1)/100;f=f.slice(0,-1)/100;a={h:h(b,0,360),s:h(e,0,1),a:h(f,0,1)};a[c]=h(f,0,1);return a}}];a.colors={aqua:new a({r:0,g:255,b:255}),black:new a({r:0,g:0,b:0}),blue:new a({r:0,g:0,b:255}),fuchsia:new a({r:255,g:0,b:255}),gray:new a({r:128,g:128,b:128}),green:new a({r:0,g:128,b:0}),lime:new a({r:0,g:255,b:0}),maroon:new a({r:128,g:0,b:0}),navy:new a({r:0,g:0,b:128}),olive:new a({r:128,g:128,b:0}),purple:new a({r:128,g:0,b:128}),red:new a({r:255,g:0,b:0}),silver:new a({r:192,
+g:192,b:192}),teal:new a({r:0,g:128,b:128}),white:new a({r:255,g:255,b:255}),yellow:new a({r:255,g:255,b:0}),aliceblue:new a({r:240,g:248,b:255}),antiquewhite:new a({r:250,g:235,b:215}),aquamarine:new a({r:127,g:255,b:212}),azure:new a({r:240,g:255,b:255}),beige:new a({r:245,g:245,b:220}),bisque:new a({r:255,g:228,b:196}),blanchedalmond:new a({r:255,g:235,b:205}),blueviolet:new a({r:138,g:43,b:226}),brown:new a({r:165,g:42,b:42}),burlywood:new a({r:222,g:184,b:135}),cadetblue:new a({r:95,g:158,b:160}),
+chartreuse:new a({r:127,g:255,b:0}),chocolate:new a({r:210,g:105,b:30}),coral:new a({r:255,g:127,b:80}),cornflowerblue:new a({r:100,g:149,b:237}),cornsilk:new a({r:255,g:248,b:220}),crimson:new a({r:220,g:20,b:60}),cyan:new a({r:0,g:255,b:255}),darkblue:new a({r:0,g:0,b:139}),darkcyan:new a({r:0,g:139,b:139}),darkgoldenrod:new a({r:184,g:134,b:11}),darkgray:new a({r:169,g:169,b:169}),darkgreen:new a({r:0,g:100,b:0}),darkgrey:new a({r:169,g:169,b:169}),darkkhaki:new a({r:189,g:183,b:107}),darkmagenta:new a({r:139,
+g:0,b:139}),darkolivegreen:new a({r:85,g:107,b:47}),darkorange:new a({r:255,g:140,b:0}),darkorchid:new a({r:153,g:50,b:204}),darkred:new a({r:139,g:0,b:0}),darksalmon:new a({r:233,g:150,b:122}),darkseagreen:new a({r:143,g:188,b:143}),darkslateblue:new a({r:72,g:61,b:139}),darkslategray:new a({r:47,g:79,b:79}),darkslategrey:new a({r:47,g:79,b:79}),darkturquoise:new a({r:0,g:206,b:209}),darkviolet:new a({r:148,g:0,b:211}),deeppink:new a({r:255,g:20,b:147}),deepskyblue:new a({r:0,g:191,b:255}),dimgray:new a({r:105,
+g:105,b:105}),dimgrey:new a({r:105,g:105,b:105}),dodgerblue:new a({r:30,g:144,b:255}),firebrick:new a({r:178,g:34,b:34}),floralwhite:new a({r:255,g:250,b:240}),forestgreen:new a({r:34,g:139,b:34}),gainsboro:new a({r:220,g:220,b:220}),ghostwhite:new a({r:248,g:248,b:255}),gold:new a({r:255,g:215,b:0}),goldenrod:new a({r:218,g:165,b:32}),greenyellow:new a({r:173,g:255,b:47}),grey:new a({r:128,g:128,b:128}),honeydew:new a({r:240,g:255,b:240}),hotpink:new a({r:255,g:105,b:180}),indianred:new a({r:205,
+g:92,b:92}),indigo:new a({r:75,g:0,b:130}),ivory:new a({r:255,g:255,b:240}),khaki:new a({r:240,g:230,b:140}),lavender:new a({r:230,g:230,b:250}),lavenderblush:new a({r:255,g:240,b:245}),lawngreen:new a({r:124,g:252,b:0}),lemonchiffon:new a({r:255,g:250,b:205}),lightblue:new a({r:173,g:216,b:230}),lightcoral:new a({r:240,g:128,b:128}),lightcyan:new a({r:224,g:255,b:255}),lightgoldenrodyellow:new a({r:250,g:250,b:210}),lightgray:new a({r:211,g:211,b:211}),lightgreen:new a({r:144,g:238,b:144}),lightgrey:new a({r:211,
+g:211,b:211}),lightpink:new a({r:255,g:182,b:193}),lightsalmon:new a({r:255,g:160,b:122}),lightseagreen:new a({r:32,g:178,b:170}),lightskyblue:new a({r:135,g:206,b:250}),lightslategray:new a({r:119,g:136,b:153}),lightslategrey:new a({r:119,g:136,b:153}),lightsteelblue:new a({r:176,g:196,b:222}),lightyellow:new a({r:255,g:255,b:224}),limegreen:new a({r:50,g:205,b:50}),linen:new a({r:250,g:240,b:230}),magenta:new a({r:255,g:0,b:255}),mediumaquamarine:new a({r:102,g:205,b:170}),mediumblue:new a({r:0,
+g:0,b:205}),mediumorchid:new a({r:186,g:85,b:211}),mediumpurple:new a({r:147,g:112,b:219}),mediumseagreen:new a({r:60,g:179,b:113}),mediumslateblue:new a({r:123,g:104,b:238}),mediumspringgreen:new a({r:0,g:250,b:154}),mediumturquoise:new a({r:72,g:209,b:204}),mediumvioletred:new a({r:199,g:21,b:133}),midnightblue:new a({r:25,g:25,b:112}),mintcream:new a({r:245,g:255,b:250}),mistyrose:new a({r:255,g:228,b:225}),moccasin:new a({r:255,g:228,b:181}),navajowhite:new a({r:255,g:222,b:173}),oldlace:new a({r:253,
+g:245,b:230}),olivedrab:new a({r:107,g:142,b:35}),orange:new a({r:255,g:165,b:0}),orangered:new a({r:255,g:69,b:0}),orchid:new a({r:218,g:112,b:214}),palegoldenrod:new a({r:238,g:232,b:170}),palegreen:new a({r:152,g:251,b:152}),paleturquoise:new a({r:175,g:238,b:238}),palevioletred:new a({r:219,g:112,b:147}),papayawhip:new a({r:255,g:239,b:213}),peachpuff:new a({r:255,g:218,b:185}),peru:new a({r:205,g:133,b:63}),pink:new a({r:255,g:192,b:203}),plum:new a({r:221,g:160,b:221}),powderblue:new a({r:176,
+g:224,b:230}),rosybrown:new a({r:188,g:143,b:143}),royalblue:new a({r:65,g:105,b:225}),saddlebrown:new a({r:139,g:69,b:19}),salmon:new a({r:250,g:128,b:114}),sandybrown:new a({r:244,g:164,b:96}),seagreen:new a({r:46,g:139,b:87}),seashell:new a({r:255,g:245,b:238}),sienna:new a({r:160,g:82,b:45}),skyblue:new a({r:135,g:206,b:235}),slateblue:new a({r:106,g:90,b:205}),slategray:new a({r:112,g:128,b:144}),slategrey:new a({r:112,g:128,b:144}),snow:new a({r:255,g:250,b:250}),springgreen:new a({r:0,g:255,
+b:127}),steelblue:new a({r:70,g:130,b:180}),tan:new a({r:210,g:180,b:140}),thistle:new a({r:216,g:191,b:216}),tomato:new a({r:255,g:99,b:71}),turquoise:new a({r:64,g:224,b:208}),violet:new a({r:238,g:130,b:238}),wheat:new a({r:245,g:222,b:179}),whitesmoke:new a({r:245,g:245,b:245}),yellowgreen:new a({r:154,g:205,b:50})};a.prototype={toName:function(){return a.toName(this)},toString:function(){return this.toHexString()},valueOf:function(){return a.toInteger(this)},rgb:function(){return this.toRGBArray()},
+toRGBArray:function(){return this.toRGBAArray().slice(0,3)},toRGBObject:function(){var a=this.toRGBArray();return{r:a[0],g:a[1],b:a[2]}},toRGBString:function(){return"rgb("+this.toRGBArray().join(",")+")"},rgba:function(){return this.toRGBAArray()},toRGBAArray:function(){return[Math.round(this.r),Math.round(this.g),Math.round(this.b),parseFloat(this.a)]},toRGBAObject:function(){var a=this.toRGBAArray();return{r:a[0],g:a[1],b:a[2],a:a[3]}},toRGBAString:function(){return"rgba("+this.toRGBAArray().join(",")+
+")"},hex:function(){return this.toHexArray()},toHexArray:function(){return this.toHexString().slice(1).match(/([\dA-F]{2})/ig)},toHexObject:function(){var a=this.toHexArray();return{r:a[0],g:a[1],b:a[2]}},toHexString:function(){return a.rgb2hex(this.r,this.g,this.b)},hsl:function(){return this.toHSLArray()},toHSLArray:function(){return this.toHSLAArray().slice(0,3)},toHSLObject:function(){var a=this.toHSLArray();return{h:a[0],s:a[1],l:a[2]}},toHSLString:function(){return"hsl("+this.toHSLArray().join(",")+
+")"},hsla:function(){return this.toHSLAArray()},toHSLAArray:function(){return[Math.round(this.h),parseFloat(this.sl),parseFloat(this.l),parseFloat(this.a)]},toHSLAObject:function(){var a=this.toHSLArray();return{h:a[0],s:a[1],l:a[2],a:a[3]}},toHSLAString:function(){return"hsla("+this.toHSLAArray().join(",")+")"},hsv:function(){return this.toHSVArray()},toHSVArray:function(){return[Math.round(this.h),parseFloat(this.sv),parseFloat(this.v)]},toHSVObject:function(){return{h:Math.round(this.h),s:parseFloat(this.sv),
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\ No newline at end of file