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