计算渐变色每一步的色值 代码
//定义渐变色的起始颜色和终止颜色
let num1 = "#e52e2e";
let num2 = "#fbc918";
//定义将颜色拆分为多少份
let steps = 50
//定义不透明度
let gamma = 1
//将HEX色值转换为RGB色值
let parseColor = function (hexStr) {
return hexStr.length === 4
? hexStr
.substr(1)
.split("")
.map(function (s) {
return 0x11 * parseInt(s, 16);
})
: [hexStr.substr(1, 2), hexStr.substr(3, 2), hexStr.substr(5, 2)].map(
function (s) {
return parseInt(s, 16);
}
);
};
let pad = function (s) {
return s.length === 1 ? "0" + s : s;
};
let gradientColors = function (start, end, steps, gamma) {
let i,
j,
ms,
me,
output = [],
so = [];
gamma = gamma || 1;
let normalize = function (channel) {
return Math.pow(channel / 255, gamma);
};
start = parseColor(start).map(normalize);
end = parseColor(end).map(normalize);
for (i = 0; i < steps; i++) {
ms = i / (steps - 1);
me = 1 - ms;
for (j = 0; j < 3; j++) {
so[j] = pad(
Math.round(
Math.pow(start[j] * me + end[j] * ms, 1 / gamma) * 255
).toString(16)
);
}
output.push("#" + so.join(""));
}
return output;
};
//打印结果
console.log(gradientColors(num1 , num2 , steps , gamma))
打印结果图片
1646281228871.jpg
打印结果为数组，可以根据自己的需求来取具体的色值
