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颜色值变换
十六进制转换成 RGB
- hex to rgb
js
// hex to rgb
// hex 形式是 3位 4位 6位
// hex 多少位补位规则 === chrome css
// 3位 #efd = #eeffdd
// 4位 #efdd = #efd 最后一位表示透明度 alpha = decimal(d / f)
// 6位 正常
function hex2rgb(hex) {
let color = hex.slice(1);
let red = parseInt(color.slice(0, 2), 16);
let green = parseInt(color.slice(2, 4), 16);
let blue = parseInt(color.slice(4, 6), 16);
return [red, green, blue];
}// hex to rgb
// hex 形式是 3位 4位 6位
// hex 多少位补位规则 === chrome css
// 3位 #efd = #eeffdd
// 4位 #efdd = #efd 最后一位表示透明度 alpha = decimal(d / f)
// 6位 正常
function hex2rgb(hex) {
let color = hex.slice(1);
let red = parseInt(color.slice(0, 2), 16);
let green = parseInt(color.slice(2, 4), 16);
let blue = parseInt(color.slice(4, 6), 16);
return [red, green, blue];
}- hex rgb alpha === rgb or hex
js
// 十六进制颜色带透明度的颜色值
function hex2rgba(hex, alpha) {
let color = hex.slice(1);
let red = parseInt(color.slice(0, 2), 16);
let green = parseInt(color.slice(2, 4), 16);
let blue = parseInt(color.slice(4, 6), 16);
red += Math.round(alpha * (255 - red));
green += Math.round(alpha * (255 - green));
blue += Math.round(alpha * (255 - blue));
// rgb 形式
// return [red, green, blue];
// hex 形式
red = red.toString(16);
green = green.toString(16);
blue = blue.toString(16);
return `#${red}${green}${blue}`;
}// 十六进制颜色带透明度的颜色值
function hex2rgba(hex, alpha) {
let color = hex.slice(1);
let red = parseInt(color.slice(0, 2), 16);
let green = parseInt(color.slice(2, 4), 16);
let blue = parseInt(color.slice(4, 6), 16);
red += Math.round(alpha * (255 - red));
green += Math.round(alpha * (255 - green));
blue += Math.round(alpha * (255 - blue));
// rgb 形式
// return [red, green, blue];
// hex 形式
red = red.toString(16);
green = green.toString(16);
blue = blue.toString(16);
return `#${red}${green}${blue}`;
}RGB 转换成十六进制
- rgb to hex
js
// rgb to hex
// rgb 形式 rgb(255, 255, 255)
function rgb2hex(red, green, blue) {
red = red.toString(16);
green = green.toString(16);
blue = blue.toString(16);
return `#${red}${green}${blue}`;
}// rgb to hex
// rgb 形式 rgb(255, 255, 255)
function rgb2hex(red, green, blue) {
red = red.toString(16);
green = green.toString(16);
blue = blue.toString(16);
return `#${red}${green}${blue}`;
}HSL 转换成 RGB
HSL
- h hue 色调 [0 - 360]
- s saturation 饱和度 [0 - 1]
- l lightless 亮度 [0 - 1]
js
// h 参数为 0 - 360 的比例 h = h / 360 区间为 0 - 1
function hsl2rgb(h, s, l) {
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return [r, g, b];
}// h 参数为 0 - 360 的比例 h = h / 360 区间为 0 - 1
function hsl2rgb(h, s, l) {
var r, g, b;
if (s == 0) {
r = g = b = l; // achromatic
} else {
function hue2rgb(p, q, t) {
if (t < 0) t += 1;
if (t > 1) t -= 1;
if (t < 1 / 6) return p + (q - p) * 6 * t;
if (t < 1 / 2) return q;
if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6;
return p;
}
var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
var p = 2 * l - q;
r = hue2rgb(p, q, h + 1 / 3);
g = hue2rgb(p, q, h);
b = hue2rgb(p, q, h - 1 / 3);
}
return [r, g, b];
}RGB 转换成 HSL
js
function rgb2hsl(r, g, b) {
(r /= 255), (g /= 255), (b /= 255);
var max = Math.max(r, g, b),
min = Math.min(r, g, b);
var h,
s,
l = (max + min) / 2;
if (max == min) {
h = s = 0; // achromatic
} else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [h, s, l];
}function rgb2hsl(r, g, b) {
(r /= 255), (g /= 255), (b /= 255);
var max = Math.max(r, g, b),
min = Math.min(r, g, b);
var h,
s,
l = (max + min) / 2;
if (max == min) {
h = s = 0; // achromatic
} else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r:
h = (g - b) / d + (g < b ? 6 : 0);
break;
case g:
h = (b - r) / d + 2;
break;
case b:
h = (r - g) / d + 4;
break;
}
h /= 6;
}
return [h, s, l];
}