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How to achieve conversion between rgb and hsl in js? Methods for converting rgb and hsl to each other (code example)
How to achieve conversion between rgb and hsl in js? Methods for converting rgb and hsl to each other (code example)
How does js realize the conversion between rgb and hsl? This article will introduce to you how to use js to convert between rgb and hsl. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
In the previous article [How to set color value in css? rgb() sets color】and【A brief discussion on how to use hsl() and hsla() to set color values in css】 We have introduced how to use rgb or hsl to set color values in css Method, in fact, rgb color values and hsl color values can be converted. Below we will use code examples to let everyone understand the implementation method of rgb color value and hsl color value mutual conversion.
js implementation to convert rgb color value to hsl
Code example:
/**
* RGB 颜色值转换为 HSL.
* 转换公式参考自 http://en.wikipedia.org/wiki/HSL_color_space.
* r, g, 和 b 需要在 [0, 255] 范围内
* 返回的 h, s, 和 l 在 [0, 1] 之间
*
* @param Number r 红色色值
* @param Number g 绿色色值
* @param Number b 蓝色色值
* @return Array HSL各值数组
*/
function rgbToHsl(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 [Math.floor(h*100), Math.round(s*100)+"%", Math.round(l*100)+"%"];
}js implementation Convert hsl color value to rgb
Code example:
/**
* HSL颜色值转换为RGB.
* 换算公式改编自 http://en.wikipedia.org/wiki/HSL_color_space.
* h, s, 和 l 设定在 [0, 1] 之间
* 返回的 r, g, 和 b 在 [0, 255]之间
*
* @param Number h 色相
* @param Number s 饱和度
* @param Number l 亮度
* @return Array RGB色值数值
*/function hslToRgb(h, s, l) {
var r, g, b;
if(s == 0) {
r = g = b = l; // achromatic
} else {
var hue2rgb = 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 [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}Summary: The above is the entire content of this article. The code is very simple, you can try it. I hope it will be helpful to everyone's learning. For more related tutorials, please visit JavaScript Video Tutorial, jQuery Video Tutorial, bootstrap Tutorial!
The above is the detailed content of How to achieve conversion between rgb and hsl in js? Methods for converting rgb and hsl to each other (code example). For more information, please follow other related articles on the PHP Chinese website!
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