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import convert from "color-convert"
import { HSL } from "./hsl"
export class ColorConverter {
private static colorToVector3Map = new Map<string, Vector3>()
private static colorToVector3ArrayMap = new Map<string, number[]>()
private static hexToNumberMap = new Map<string, number>()
static getVector3(color: string) {
let vector = this.colorToVector3Map.get(color)
if (vector === undefined) {
vector = ColorConverter.colorToVector3(color)
this.colorToVector3Map.set(color, vector)
}
return vector
}
static getVector3Array(color: string) {
let array = this.colorToVector3ArrayMap.get(color)
if (array === undefined) {
array = ColorConverter.colorToVector3Array(color)
this.colorToVector3ArrayMap.set(color, array)
}
return array
}
static getNumber(hex: string) {
let number = this.hexToNumberMap.get(hex)
if (number === undefined) {
number = ColorConverter.convertHexToNumber(hex)
this.hexToNumberMap.set(hex, number)
}
return number
}
static convertHexToNumber(hex: string) {
return Number(`0x${hex.slice(1)}`)
}
static convertNumberToHex(colorNumber: number) {
const hexColor = colorNumber.toString(16)
const zeros = "0".repeat(6 - hexColor.length)
return `#${zeros}${hexColor}`
}
static convertHexToRgba(hex: string, opacity = 1) {
const rgbColor = this.encodeHex(hex)
return `rgba(${rgbColor.join(",")},${opacity})`
}
static convertHexToColorObject(hex: string) {
const rgbColor = this.encodeHex(hex)
return new Color(...rgbColor)
}
static convertColorToHex(colorObject: Color) {
return [colorObject.r, colorObject.g, colorObject.b].reduce((string, color) => {
string += Math.round(color).toString(16).padStart(2, "0")
return string
}, "#")
}
static hexToHSL(hex: string) {
const hsl = convert.hex.hsl(hex)
return new HSL(...hsl)
}
static colorToVector3(color: string) {
const convertedColor = ColorConverter.convertHexToNumber(color)
return new Vector3(((convertedColor >> 16) & 0xff) / 255, ((convertedColor >> 8) & 0xff) / 255, (convertedColor & 0xff) / 255)
}
static colorToVector3Array(color: string) {
const convertedColor = ColorConverter.convertHexToNumber(color)
return [((convertedColor >> 16) & 0xff) / 255, ((convertedColor >> 8) & 0xff) / 255, (convertedColor & 0xff) / 255]
}
static vector3ToRGB(vector: Vector3) {
const r = Math.floor(vector.x * 255)
const g = Math.floor(vector.y * 255)
const b = Math.floor(vector.z * 255)
return new Color(r, g, b)
}
static gradient(startColor: string, endColor: string, steps: number) {
const start = this.convertHexToColorObject(startColor)
const end = this.convertHexToColorObject(endColor)
const diff = end.sub(start)
const stepsArray: string[] = []
for (let index = 0; index <= steps; index++) {
const stepDiff = diff.clone().multiplyScalar((1 / steps) * index)
const step = start.clone().add(stepDiff)
stepsArray[index] = this.convertColorToHex(step)
}
return stepsArray
}
static getImageDataUri(hex: string) {
const rgbColor = this.encodeHex(hex)
const encodedRGBColor = this.encodeRGB(rgbColor[0], rgbColor[1], rgbColor[2])
return this.generatePixel(encodedRGBColor)
}
private static encodeHex(string: string) {
// Cut off the hash sign.
let hex = string.slice(1)
if (hex.length === 3) {
// Always use the six character hex color encoding instead of the shorter
// three character one.
hex = `${hex[0]}${hex[0]}${hex[1]}${hex[1]}${hex[2]}${hex[2]}`
}
return [
Number.parseInt(`${hex[0]}${hex[1]}`, 16),
Number.parseInt(`${hex[2]}${hex[3]}`, 16),
Number.parseInt(`${hex[4]}${hex[5]}`, 16)
]
}
private static encodeRGB(r: number, g: number, b: number) {
return this.encodeTriplet(0, r, g) + this.encodeTriplet(b, 255, 255)
}
private static encodeTriplet(a: number, b: number, c: number) {
const keyString = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
const enc1 = a >> 2
const enc2 = ((a & 3) << 4) | (b >> 4)
const enc3 = ((b & 15) << 2) | (c >> 6)
const enc4 = c & 63
return keyString.charAt(enc1) + keyString.charAt(enc2) + keyString.charAt(enc3) + keyString.charAt(enc4)
}
private static generatePixel(color: string) {
return `data:image/gif;base64,R0lGODlhAQABAPAA${color}/yH5BAAAAAAALAAAAAABAAEAAAICRAEAOw==`
}
}
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