// src/utils/gen-color.ts
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// 定义颜色类型
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type RGB = {
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r: number;
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g: number;
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b: number;
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};
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type HSL = {
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h: number;
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s: number;
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l: number;
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};
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type HEX =
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| '0'
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| '1'
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| '2'
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| '3'
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| '4'
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| '5'
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| '6'
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| '7'
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| '8'
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| '9'
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| 'A'
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| 'B'
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| 'C'
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| 'D'
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| 'E'
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| 'F';
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const RGBUnit = 255;
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const HEX_MAP: Record<HEX, number> = {
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0: 0,
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1: 1,
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2: 2,
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3: 3,
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4: 4,
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5: 5,
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6: 6,
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7: 7,
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8: 8,
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9: 9,
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A: 10,
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B: 11,
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C: 12,
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D: 13,
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E: 14,
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F: 15,
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};
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const rgbWhite = {
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r: 255,
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g: 255,
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b: 255,
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};
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const rgbBlack = {
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r: 0,
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g: 0,
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b: 0,
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};
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/**
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* RGB颜色转HSL颜色值
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* @param r 红色值
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* @param g 绿色值
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* @param b 蓝色值
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* @returns { h: [0, 360]; s: [0, 1]; l: [0, 1] }
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*/
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function rgbToHsl(rgb: RGB): HSL {
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let { r, g, b } = rgb;
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const hsl = {
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h: 0,
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s: 0,
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l: 0,
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};
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// 计算rgb基数 ∈ [0, 1]
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r /= RGBUnit;
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g /= RGBUnit;
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b /= RGBUnit;
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const max = Math.max(r, g, b);
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const min = Math.min(r, g, b);
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// 计算h
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if (max === min) {
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hsl.h = 0;
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} else if (max === r) {
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hsl.h = 60 * ((g - b) / (max - min)) + (g >= b ? 0 : 360);
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} else if (max === g) {
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hsl.h = 60 * ((b - r) / (max - min)) + 120;
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} else {
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hsl.h = 60 * ((r - g) / (max - min)) + 240;
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}
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hsl.h = hsl.h > 360 ? hsl.h - 360 : hsl.h;
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// 计算l
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hsl.l = (max + min) / 2;
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// 计算s
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if (hsl.l === 0 || max === min) {
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// 灰/白/黑
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hsl.s = 0;
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} else if (hsl.l > 0 && hsl.l <= 0.5) {
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hsl.s = (max - min) / (max + min);
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} else {
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hsl.s = (max - min) / (2 - (max + min));
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}
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return hsl;
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}
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/**
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* hsl -> rgb
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* @param h [0, 360]
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* @param s [0, 1]
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* @param l [0, 1]
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* @returns RGB
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*/
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function hslToRgb(hsl: HSL): RGB {
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const { h, s, l } = hsl;
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const q = l < 0.5 ? l * (1 + s) : l + s - l * s;
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const p = 2 * l - q;
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const hUnit = h / 360; // 色相转换为 [0, 1]
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const Cr = fillCircleVal(hUnit + 1 / 3);
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const Cg = fillCircleVal(hUnit);
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const Cb = fillCircleVal(hUnit - 1 / 3);
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// 保持 [0, 1] 环状取值
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function fillCircleVal(val: number): number {
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return val < 0 ? val + 1 : val > 1 ? val - 1 : val;
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}
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function computedRgb(val: number): number {
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let colorVal: number;
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if (val < 1 / 6) {
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colorVal = p + (q - p) * 6 * val;
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} else if (val >= 1 / 6 && val < 1 / 2) {
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colorVal = q;
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} else if (val >= 1 / 2 && val < 2 / 3) {
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colorVal = p + (q - p) * 6 * (2 / 3 - val);
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} else {
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colorVal = p;
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}
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return colorVal * 255;
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}
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return {
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r: Number(computedRgb(Cr).toFixed(0)),
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g: Number(computedRgb(Cg).toFixed(0)),
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b: Number(computedRgb(Cb).toFixed(0)),
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};
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}
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/**
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* 16进制颜色转换RGB
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* @param color #rrggbb
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* @returns RGB
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*/
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function hexToRGB(hex: string): RGB {
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hex = hex.toUpperCase();
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const hexRegExp = /^#([0-9A-F]{6})$/;
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if (!hexRegExp.test(hex)) {
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throw new Error('请传入合法的16进制颜色值，eg: #FF0000');
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}
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const hexValArr = (hexRegExp.exec(hex)?.[1] || '000000').split(
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''
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) as Array<HEX>;
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return {
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r: HEX_MAP[hexValArr[0]] * 16 + HEX_MAP[hexValArr[1]],
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g: HEX_MAP[hexValArr[2]] * 16 + HEX_MAP[hexValArr[3]],
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b: HEX_MAP[hexValArr[4]] * 16 + HEX_MAP[hexValArr[5]],
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};
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}
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/**
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* rgb 转 16进制
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* @param rgb RGB
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* @returns #HEX{6}
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*/
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function rgbToHex(rgb: RGB): string {
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const HEX_MAP_REVERSE: Record<string, HEX> = {};
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for (const key in HEX_MAP) {
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HEX_MAP_REVERSE[HEX_MAP[key as HEX]] = key as HEX;
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}
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function getRemainderAndQuotient(val: number): string {
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val = Math.round(val);
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return `${HEX_MAP_REVERSE[Math.floor(val / 16)]}${
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HEX_MAP_REVERSE[val % 16]
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}`;
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}
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return `#${getRemainderAndQuotient(rgb.r)}${getRemainderAndQuotient(
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rgb.g
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)}${getRemainderAndQuotient(rgb.b)}`;
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}
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// hsl 转 16进制
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function hslToHex(hsl: HSL): string {
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return rgbToHex(hslToRgb(hsl));
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}
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// 16进制 转 hsl
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function hexToHsl(hex: string): HSL {
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return rgbToHsl(hexToRGB(hex));
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}
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// 生成混合色（混黑 + 混白）
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function genMixColor(base: string | RGB | HSL): {
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DEFAULT: string;
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dark: {
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1: string;
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2: string;
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3: string;
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4: string;
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5: string;
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6: string;
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7: string;
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8: string;
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9: string;
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};
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light: {
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1: string;
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2: string;
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3: string;
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4: string;
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5: string;
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6: string;
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7: string;
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8: string;
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9: string;
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};
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} {
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// 基准色统一转换为RGB，方便进行混合色生成
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if (typeof base === 'string') {
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base = hexToRGB(base);
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} else if ('h' in base) {
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base = hslToRgb(base);
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}
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// 混合色（这里参考Sass mix函数逻辑，本质上就是两种颜色的rbg各个值加权平均）
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function mix(color: RGB, mixColor: RGB, weight: number): RGB {
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return {
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r: color.r * (1 - weight) + mixColor.r * weight,
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g: color.g * (1 - weight) + mixColor.g * weight,
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b: color.b * (1 - weight) + mixColor.b * weight,
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};
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}
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return {
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DEFAULT: rgbToHex(base),
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dark: {
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1: rgbToHex(mix(base, rgbBlack, 0.1)),
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2: rgbToHex(mix(base, rgbBlack, 0.2)),
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3: rgbToHex(mix(base, rgbBlack, 0.3)),
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4: rgbToHex(mix(base, rgbBlack, 0.4)),
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5: rgbToHex(mix(base, rgbBlack, 0.5)),
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6: rgbToHex(mix(base, rgbBlack, 0.6)),
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7: rgbToHex(mix(base, rgbBlack, 0.7)),
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8: rgbToHex(mix(base, rgbBlack, 0.78)),
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9: rgbToHex(mix(base, rgbBlack, 0.85)),
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},
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light: {
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1: rgbToHex(mix(base, rgbWhite, 0.1)),
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2: rgbToHex(mix(base, rgbWhite, 0.2)),
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3: rgbToHex(mix(base, rgbWhite, 0.3)),
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4: rgbToHex(mix(base, rgbWhite, 0.4)),
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5: rgbToHex(mix(base, rgbWhite, 0.5)),
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6: rgbToHex(mix(base, rgbWhite, 0.6)),
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7: rgbToHex(mix(base, rgbWhite, 0.7)),
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8: rgbToHex(mix(base, rgbWhite, 0.78)),
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9: rgbToHex(mix(base, rgbWhite, 0.85)),
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},
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};
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}
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export {
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genMixColor,
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rgbToHsl,
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rgbToHex,
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hslToRgb,
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hslToHex,
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hexToRGB,
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hexToHsl,
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};
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