/**
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* 求两个颜色之间的渐变值
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* @param {string} startColor 开始的颜色
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* @param {string} endColor 结束的颜色
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* @param {number} step 颜色等分的份额
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* */
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function colorGradient(startColor = 'rgb(0, 0, 0)', endColor = 'rgb(255, 255, 255)', step = 10) {
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let startRGB = hexToRgb(startColor, false); //转换为rgb数组模式
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let startR = startRGB[0];
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let startG = startRGB[1];
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let startB = startRGB[2];
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let endRGB = hexToRgb(endColor, false);
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let endR = endRGB[0];
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let endG = endRGB[1];
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let endB = endRGB[2];
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let sR = (endR - startR) / step; //总差值
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let sG = (endG - startG) / step;
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let sB = (endB - startB) / step;
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let colorArr = [];
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for (let i = 0; i < step; i++) {
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//计算每一步的hex值
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let hex = rgbToHex('rgb(' + Math.round((sR * i + startR)) + ',' + Math.round((sG * i + startG)) + ',' + Math.round((sB *
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i + startB)) + ')');
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colorArr.push(hex);
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}
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return colorArr;
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}
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// 将hex表示方式转换为rgb表示方式(这里返回rgb数组模式)
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function hexToRgb(sColor, str = true) {
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let reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
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sColor = sColor.toLowerCase();
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if (sColor && reg.test(sColor)) {
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if (sColor.length === 4) {
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let sColorNew = "#";
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for (let i = 1; i < 4; i += 1) {
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sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1));
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}
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sColor = sColorNew;
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}
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//处理六位的颜色值
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let sColorChange = [];
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for (let i = 1; i < 7; i += 2) {
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sColorChange.push(parseInt("0x" + sColor.slice(i, i + 2)));
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}
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if(!str) {
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return sColorChange;
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} else {
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return `rgb(${sColorChange[0]},${sColorChange[1]},${sColorChange[2]})`;
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}
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} else if (/^(rgb|RGB)/.test(sColor)) {
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let arr = sColor.replace(/(?:\(|\)|rgb|RGB)*/g, "").split(",")
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return arr.map(val => Number(val));
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} else {
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return sColor;
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}
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};
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// 将rgb表示方式转换为hex表示方式
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function rgbToHex(rgb) {
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let _this = rgb;
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let reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/;
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if (/^(rgb|RGB)/.test(_this)) {
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let aColor = _this.replace(/(?:\(|\)|rgb|RGB)*/g, "").split(",");
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let strHex = "#";
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for (let i = 0; i < aColor.length; i++) {
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let hex = Number(aColor[i]).toString(16);
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hex = String(hex).length == 1 ? 0 + '' + hex : hex; // 保证每个rgb的值为2位
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if (hex === "0") {
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hex += hex;
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}
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strHex += hex;
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}
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if (strHex.length !== 7) {
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strHex = _this;
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}
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return strHex;
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} else if (reg.test(_this)) {
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let aNum = _this.replace(/#/, "").split("");
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if (aNum.length === 6) {
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return _this;
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} else if (aNum.length === 3) {
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let numHex = "#";
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for (let i = 0; i < aNum.length; i += 1) {
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numHex += (aNum[i] + aNum[i]);
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}
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return numHex;
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}
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} else {
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return _this;
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}
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}
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/**
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* JS颜色十六进制转换为rgb或rgba,返回的格式为 rgba（255，255，255，0.5）字符串
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* sHex为传入的十六进制的色值
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* alpha为rgba的透明度
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*/
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function colorToRgba(color, alpha = 0.3) {
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color = rgbToHex(color)
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// 十六进制颜色值的正则表达式
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var reg = /^#([0-9a-fA-f]{3}|[0-9a-fA-f]{6})$/
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/* 16进制颜色转为RGB格式 */
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let sColor = color.toLowerCase()
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if (sColor && reg.test(sColor)) {
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if (sColor.length === 4) {
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var sColorNew = '#'
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for (let i = 1; i < 4; i += 1) {
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sColorNew += sColor.slice(i, i + 1).concat(sColor.slice(i, i + 1))
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}
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sColor = sColorNew
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}
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// 处理六位的颜色值
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var sColorChange = []
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for (let i = 1; i < 7; i += 2) {
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sColorChange.push(parseInt('0x' + sColor.slice(i, i + 2)))
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}
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// return sColorChange.join(',')
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return 'rgba(' + sColorChange.join(',') + ',' + alpha + ')'
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}
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else {
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return sColor
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}
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}
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export default {
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colorGradient,
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hexToRgb,
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rgbToHex,
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colorToRgba
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}
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