chroma.js

/**
 * chroma.js - JavaScript library for color conversions
 *
 * Copyright (c) 2011-2024, Gregor Aisch
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. The name Gregor Aisch may not be used to endorse or promote products
 * derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL GREGOR AISCH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * -------------------------------------------------------
 *
 * chroma.js includes colors from colorbrewer2.org, which are released under
 * the following license:
 *
 * Copyright (c) 2002 Cynthia Brewer, Mark Harrower,
 * and The Pennsylvania State University.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * ------------------------------------------------------
 *
 * Named colors are taken from X11 Color Names.
 * http://www.w3.org/TR/css3-color/#svg-color
 *
 * @preserve
 */

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en={aliceblue:"#f0f8ff",antiquewhite:"#faebd7",aqua:"#00ffff",aquamarine:"#7fffd4",azure:"#f0ffff",beige:"#f5f5dc",bisque:"#ffe4c4",black:"#000000",blanchedalmond:"#ffebcd",blue:"#0000ff",blueviolet:"#8a2be2",brown:"#a52a2a",burlywood:"#deb887",cadetblue:"#5f9ea0",chartreuse:"#7fff00",chocolate:"#d2691e",coral:"#ff7f50",cornflowerblue:"#6495ed",cornsilk:"#fff8dc",crimson:"#dc143c",cyan:"#00ffff",darkblue:"#00008b",darkcyan:"#008b8b",darkgoldenrod:"#b8860b",darkgray:"#a9a9a9",darkgreen:"#006400",darkgrey:"#a9a9a9",darkkhaki:"#bdb76b",darkmagenta:"#8b008b",darkolivegreen:"#556b2f",darkorange:"#ff8c00",darkorchid:"#9932cc",darkred:"#8b0000",darksalmon:"#e9967a",darkseagreen:"#8fbc8f",darkslateblue:"#483d8b",darkslategray:"#2f4f4f",darkslategrey:"#2f4f4f",darkturquoise:"#00ced1",darkviolet:"#9400d3",deeppink:"#ff1493",deepskyblue:"#00bfff",dimgray:"#696969",dimgrey:"#696969",dodgerblue:"#1e90ff",firebrick:"#b22222",floralwhite:"#fffaf0",forestgreen:"#228b22",fuchsia:"#ff00ff",gainsboro:"#dcdcdc",ghostwhite:"#f8f8ff",gold:"#ffd700",goldenrod:"#daa520",gray:"#808080",green:"#008000",greenyellow:"#adff2f",grey:"#808080",honeydew:"#f0fff0",hotpink:"#ff69b4",indianred:"#cd5c5c",indigo:"#4b0082",ivory:"#fffff0",khaki:"#f0e68c",laserlemon:"#ffff54",lavender:"#e6e6fa",lavenderblush:"#fff0f5",lawngreen:"#7cfc00",lemonchiffon:"#fffacd",lightblue:"#add8e6",lightcoral:"#f08080",lightcyan:"#e0ffff",lightgoldenrod:"#fafad2",lightgoldenrodyellow:"#fafad2",lightgray:"#d3d3d3",lightgreen:"#90ee90",lightgrey:"#d3d3d3",lightpink:"#ffb6c1",lightsalmon:"#ffa07a",lightseagreen:"#20b2aa",lightskyblue:"#87cefa",lightslategray:"#778899",lightslategrey:"#778899",lightsteelblue:"#b0c4de",lightyellow:"#ffffe0",lime:"#00ff00",limegreen:"#32cd32",linen:"#faf0e6",magenta:"#ff00ff",maroon:"#800000",maroon2:"#7f0000",maroon3:"#b03060",mediumaquamarine:"#66cdaa",mediumblue:"#0000cd",mediumorchid:"#ba55d3",mediumpurple:"#9370db",mediumseagreen:"#3cb371",mediumslateblue:"#7b68ee",mediumspringgreen:"#00fa9a",mediumturquoise:"#48d1cc",mediumvioletred:"#c71585",midnightblue:"#191970",mintcream:"#f5fffa",mistyrose:"#ffe4e1",moccasin:"#ffe4b5",navajowhite:"#ffdead",navy:"#000080",oldlace:"#fdf5e6",olive:"#808000",olivedrab:"#6b8e23",orange:"#ffa500",orangered:"#ff4500",orchid:"#da70d6",palegoldenrod:"#eee8aa",palegreen:"#98fb98",paleturquoise:"#afeeee",palevioletred:"#db7093",papayawhip:"#ffefd5",peachpuff:"#ffdab9",peru:"#cd853f",pink:"#ffc0cb",plum:"#dda0dd",powderblue:"#b0e0e6",purple:"#800080",purple2:"#7f007f",purple3:"#a020f0",rebeccapurple:"#663399",red:"#ff0000",rosybrown:"#bc8f8f",royalblue:"#4169e1",saddlebrown:"#8b4513",salmon:"#fa8072",sandybrown:"#f4a460",seagreen:"#2e8b57",seashell:"#fff5ee",sienna:"#a0522d",silver:"#c0c0c0",skyblue:"#87ceeb",slateblue:"#6a5acd",slategray:"#708090",slategrey:"#708090",snow:"#fffafa",springgreen:"#00ff7f",steelblue:"#4682b4",tan:"#d2b48c",teal:"#008080",thistle:"#d8bfd8",tomato:"#ff6347",turquoise:"#40e0d0",violet:"#ee82ee",wheat:"#f5deb3",white:"#ffffff",whitesmoke:"#f5f5f5",yellow:"#ffff00",yellowgreen:"#9acd32"};M.prototype.name=function(){for(var r=Fr(this._rgb,"rgb"),n=0,e=Object.keys(en);n<e.length;n+=1){var t=e[n];if(en[t]===r)return t.toLowerCase()}return r},k.format.named=function(r){if(r=r.toLowerCase(),en[r])return Or(en[r]);throw new Error("unknown color name: "+r)},k.autodetect.push({p:5,test:function(r){for(var n=[],e=arguments.length-1;e-- >0;)n[e]=arguments[e+1];if(!n.length&&"string"===c(r)&&en[r.toLowerCase()])return"named"}}),M.prototype.alpha=function(r,n){return void 0===n&&(n=!1),void 0!==r&&"number"===c(r)?n?(this._rgb[3]=r,this):new M([this._rgb[0],this._rgb[1],this._rgb[2],r],"rgb"):this._rgb[3]},M.prototype.clipped=function(){return this._rgb._clipped||!1},M.prototype.darken=function(r){void 0===r&&(r=1);var n=this.lab();return n[0]-=j.Kn*r,new M(n,"lab").alpha(this.alpha(),!0)},M.prototype.brighten=function(r){return void 0===r&&(r=1),this.darken(-r)},M.prototype.darker=M.prototype.darken,M.prototype.brighter=M.prototype.brighten,M.prototype.get=function(r){var n=r.split("."),e=n[0],t=n[1],a=this[e]();if(t){var f=e.indexOf(t)-("ok"===e.substr(0,2)?2:0);if(f>-1)return a[f];throw new Error("unknown channel "+t+" in mode "+e)}return a};var tn=Math.pow;M.prototype.luminance=function(r,n){if(void 0===n&&(n="rgb"),void 0!==r&&"number"===c(r)){if(0===r)return new M([0,0,0,this._rgb[3]],"rgb");if(1===r)return new M([255,255,255,this._rgb[3]],"rgb");var e=this.luminance(),t=20,a=function(e,f){var o=e.interpolate(f,.5,n),u=o.luminance();return Math.abs(r-u)<1e-7||!t--?o:u>r?a(e,o):a(o,f)},f=(e>r?a(new M([0,0,0]),this):a(this,new M([255,255,255]))).rgb();return new M(f.concat([this._rgb[3]]))}return an.apply(void 0,this._rgb.slice(0,3))};var an=function(r,n,e){return.2126*(r=fn(r))+.7152*(n=fn(n))+.0722*(e=fn(e))},fn=function(r){return(r/=255)<=.03928?r/12.92:tn((r+.055)/1.055,2.4)},on={};function un(r,n,e){void 0===e&&(e=.5);for(var t=[],a=arguments.length-3;a-- >0;)t[a]=arguments[a+3];var f=t[0]||"lrgb";if(on[f]||t.length||(f=Object.keys(on)[0]),!on[f])throw new Error("interpolation mode "+f+" is not defined");return"object"!==c(r)&&(r=new M(r)),"object"!==c(n)&&(n=new M(n)),on[f](r,n,e).alpha(r.alpha()+e*(n.alpha()-r.alpha()))}M.prototype.mix=M.prototype.interpolate=function(r,n){void 0===n&&(n=.5);for(var e=[],t=arguments.length-2;t-- >0;)e[t]=arguments[t+2];return un.apply(void 0,[this,r,n].concat(e))},M.prototype.premultiply=function(r){void 0===r&&(r=!1);var n=this._rgb,e=n[3];return r?(this._rgb=[n[0]*e,n[1]*e,n[2]*e,e],this):new M([n[0]*e,n[1]*e,n[2]*e,e],"rgb")},M.prototype.saturate=function(r){void 0===r&&(r=1);var n=this.lch();return n[1]+=j.Kn*r,n[1]<0&&(n[1]=0),new M(n,"lch").alpha(this.alpha(),!0)},M.prototype.desaturate=function(r){return void 0===r&&(r=1),this.saturate(-r)},M.prototype.set=function(r,n,e){void 0===e&&(e=!1);var t=r.split("."),a=t[0],f=t[1],o=this[a]();if(f){var 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M(cn(ln(a,2)*(1-e)+ln(c,2)*e),cn(ln(f,2)*(1-e)+ln(i,2)*e),cn(ln(o,2)*(1-e)+ln(l,2)*e),"rgb")};function hn(r,n,e,t){var a,f,o,u,c,i,l,h,s,d,b,g,v;return"hsl"===t?(o=r.hsl(),u=n.hsl()):"hsv"===t?(o=r.hsv(),u=n.hsv()):"hcg"===t?(o=r.hcg(),u=n.hcg()):"hsi"===t?(o=r.hsi(),u=n.hsi()):"lch"===t||"hcl"===t?(t="hcl",o=r.hcl(),u=n.hcl()):"oklch"===t&&(o=r.oklch().reverse(),u=n.oklch().reverse()),"h"!==t.substr(0,1)&&"oklch"!==t||(c=(a=o)[0],l=a[1],s=a[2],i=(f=u)[0],h=f[1],d=f[2]),isNaN(c)||isNaN(i)?isNaN(c)?isNaN(i)?g=Number.NaN:(g=i,1!=s&&0!=s||"hsv"==t||(b=h)):(g=c,1!=d&&0!=d||"hsv"==t||(b=l)):g=c+e*(i>c&&i-c>180?i-(c+360):i<c&&c-i>180?i+360-c:i-c),void 0===b&&(b=l+e*(h-l)),v=s+e*(d-s),new M("oklch"===t?[v,b,g]:[g,b,v],t)}on.lab=function(r,n,e){var t=r.lab(),a=n.lab();return new M(t[0]+e*(a[0]-t[0]),t[1]+e*(a[1]-t[1]),t[2]+e*(a[2]-t[2]),"lab")};var sn=function(r,n,e){return hn(r,n,e,"lch")};on.lch=sn,on.hcl=sn;on.num=function(r,n,e){var t=r.num(),a=n.num();return new M(t+e*(a-t),"num")};on.hcg=function(r,n,e){return hn(r,n,e,"hcg")};on.hsi=function(r,n,e){return hn(r,n,e,"hsi")};on.hsl=function(r,n,e){return hn(r,n,e,"hsl")};on.hsv=function(r,n,e){return hn(r,n,e,"hsv")};on.oklab=function(r,n,e){var t=r.oklab(),a=n.oklab();return new M(t[0]+e*(a[0]-t[0]),t[1]+e*(a[1]-t[1]),t[2]+e*(a[2]-t[2]),"oklab")};on.oklch=function(r,n,e){return hn(r,n,e,"oklch")};var dn=Math.pow,bn=Math.sqrt,gn=Math.PI,vn=Math.cos,pn=Math.sin,mn=Math.atan2;var yn=function(r,n){for(var e=r.length,a=[0,0,0,0],f=0;f<r.length;f++){var o=r[f],u=n[f]/e,c=o._rgb;a[0]+=dn(c[0],2)*u,a[1]+=dn(c[1],2)*u,a[2]+=dn(c[2],2)*u,a[3]+=c[3]*u}return a[0]=bn(a[0]),a[1]=bn(a[1]),a[2]=bn(a[2]),a[3]>.9999999&&(a[3]=1),new M(t(a))},wn=Math.pow;function kn(r){var n="rgb",t=N("#ccc"),a=0,f=[0,1],o=[],u=[0,0],i=!1,l=[],h=!1,s=0,d=1,b=!1,g={},v=!0,p=1,m=function(r){if((r=r||["#fff","#000"])&&"string"===c(r)&&N.brewer&&N.brewer[r.toLowerCase()]&&(r=N.brewer[r.toLowerCase()]),"array"===c(r)){1===r.length&&(r=[r[0],r[0]]),r=r.slice(0);for(var n=0;n<r.length;n++)r[n]=N(r[n]);o.length=0;for(var e=0;e<r.length;e++)o.push(e/(r.length-1))}return M(),l=r},y=function(r){return r},w=function(r){return r},k=function(r,a){var f,h;if(null==a&&(a=!1),isNaN(r)||null===r)return t;if(a)h=r;else if(i&&i.length>2){var b=function(r){if(null!=i){for(var n=i.length-1,e=0;e<n&&r>=i[e];)e++;return e-1}return 0}(r);h=b/(i.length-2)}else h=d!==s?(r-s)/(d-s):1;h=w(h),a||(h=y(h)),1!==p&&(h=wn(h,p)),h=e(h=u[0]+h*(1-u[0]-u[1]),0,1);var m=Math.floor(1e4*h);if(v&&g[m])f=g[m];else{if("array"===c(l))for(var k=0;k<o.length;k++){var 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255===r||(r=n/255*255/(1-r/255))>255?255:r}))),Mn.burn=Nn(xn((function(r,n){return 255*(1-(1-n/255)/(r/255))})));var _n=Math.pow,An=Math.sin,jn=Math.cos;var En=Math.floor,Rn=Math.random;var On=Math.log,Pn=Math.pow,Fn=Math.floor,Ln=Math.abs;function Bn(r,n){void 0===n&&(n=null);var e={min:Number.MAX_VALUE,max:-1*Number.MAX_VALUE,sum:0,values:[],count:0};return"object"===c(r)&&(r=Object.values(r)),r.forEach((function(r){n&&"object"===c(r)&&(r=r[n]),null==r||isNaN(r)||(e.values.push(r),e.sum+=r,r<e.min&&(e.min=r),r>e.max&&(e.max=r),e.count+=1)})),e.domain=[e.min,e.max],e.limits=function(r,n){return Gn(e,r,n)},e}function Gn(r,n,e){void 0===n&&(n="equal"),void 0===e&&(e=7),"array"==c(r)&&(r=Bn(r));var t=r.min,a=r.max,f=r.values.sort((function(r,n){return r-n}));if(1===e)return[t,a];var o=[];if("c"===n.substr(0,1)&&(o.push(t),o.push(a)),"e"===n.substr(0,1)){o.push(t);for(var u=1;u<e;u++)o.push(t+u/e*(a-t));o.push(a)}else if("l"===n.substr(0,1)){if(t<=0)throw new Error("Logarithmic scales are 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X=[],Z=0;Z<e;Z++)X.push(Y[Z][0]),X.push(Y[Z][Y[Z].length-1]);X=X.sort((function(r,n){return r-n})),o.push(X[0]);for(var $=1;$<X.length;$+=2){var S=X[$];isNaN(S)||-1!==o.indexOf(S)||o.push(S)}}return o}
/**
     * @license
     *
     * The APCA contrast prediction algorithm is based of the formulas published
     * in the APCA-1.0.98G specification by Myndex. The specification is available at:
     * https://raw.githubusercontent.com/Myndex/apca-w3/master/images/APCAw3_0.1.17_APCA0.0.98G.svg
     *
     * Note that the APCA implementation is still beta, so please update to
     * future versions of chroma.js when they become available.
     *
     * You can read more about the APCA Readability Criterion at
     * https://readtech.org/ARC/
     */
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