let e = null,

r = 0,

F = 100,

t = ['ff0000', 'ffff00', '00ff00', '0000ff']

function n(n) {

if (n.length < 2) throw new Error('Rainbow must have two or more colours.')

{

const o = (F - r) / (n.length - 1),

i = new ColourGradient()

i.setGradient(n[0], n[1]), i.setNumberRange(r, r + o), (e = [i])

for (let F = 1; F < n.length - 1; F += 1) {

const t = new ColourGradient()

t.setGradient(n[F], n[F + 1]),

t.setNumberRange(r + o * F, r + o * (F + 1)),

(e[F] = t)

}

t = n

}

}

n(t),

(this.setSpectrum = function() {

return n(arguments), this

}),

(this.setSpectrumByArray = function(e) {

return n(e), this

}),

(this.colourAt = function(t) {

if (isNaN(t)) throw new TypeError(t + ' is not a number')

if (1 === e.length) return e[0].colourAt(t)

{

const n = (F - r) / e.length,

o = Math.min(Math.floor((Math.max(t, r) - r) / n), e.length - 1)

return e[o].colourAt(t)

}

}),

(this.colorAt = this.colourAt),

(this.setNumberRange = function(e, o) {

if (!(o > e))

throw new RangeError(

`maxNumber (${o}) is not greater than minNumber (${e})`,

)

return (r = e), (F = o), n(t), this

})

let e = 'ff0000',

r = '0000ff',

F = 0,

t = 100

function n(e, r, n) {

let o = e

o < F && (o = F), o > t && (o = t)

const i = t - F,

a = parseInt(r, 16),

l = (parseInt(n, 16) - a) / i,

u = Math.round(l * (o - F) + a)

return 1 === (s = u.toString(16)).length ? '0' + s : s

var s

}

function o(e) {

if (

(function(e) {

return /^#?[0-9a-fA-F]{6}$/i.test(e)

})(e)

)

return e.substring(e.length - 6, e.length)

{

const r = e.toLowerCase()

if (i.hasOwnProperty(r)) return i[r]

throw new Error(e + ' is not a valid colour.')

}

}

;(this.setGradient = function(F, t) {

;(e = o(F)), (r = o(t))

}),

(this.setNumberRange = function(e, r) {

if (!(r > e))

throw new RangeError(

`maxNumber (${r}) is not greater than minNumber (${e})`,

)

;(F = e), (t = r)

}),

(this.colourAt = function(F) {

return (

n(F, e.substring(0, 2), r.substring(0, 2)) +

n(F, e.substring(2, 4), r.substring(2, 4)) +

n(F, e.substring(4, 6), r.substring(4, 6))

)

})

var i = {

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',

lavender: 'E6E6FA',

lavenderblush: 'FFF0F5',

lawngreen: '7CFC00',

lemonchiffon: 'FFFACD',

lightblue: 'ADD8E6',

lightcoral: 'F08080',

lightcyan: 'E0FFFF',

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',

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',

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',

}