Merge pull request #1232 from soham0-0/HSLRGB

Added HSL to RGB and RGB to HSL snippets. 2 commits only.

snippets/HSLToRGB.md

@@ -0,0 +1,26 @@
+---
+title: HSLToRGB
+tags: math,intermediate
+---
+
+Converts a HSL color tuple to RGB format.
+
+- Use the [HSL to RGB conversion formula](https://en.wikipedia.org/wiki/HSL_and_HSV#HSL_to_RGB) to convert to the appropriate format.
+- The range of the input parameters is H: [0, 360], S: [0, 100], L: [0, 100].
+- The range of all output values is [0, 255].
+
+```js
+const HSLToRGB = (h, s, l) => {
+  s /= 100;
+  l /= 100;
+  const k = n => (n + h / 30) % 12;
+  const a = s * Math.min(l, 1 - l);
+  const f = n =>
+    l - a * Math.max(-1, Math.min(k(n) - 3, Math.min(9 - k(n), 1)));
+  return [255 * f(0), 255 * f(8), 255 * f(4)];
+};
+```
+
+```js
+HSLToRGB(13, 100, 11); // [56.1, 12.155, 0]
+```

snippets/RGBToHSL.md

@@ -0,0 +1,36 @@
+---
+title: RGBToHSL
+tags: math,intermediate
+---
+
+Converts a RGB color tuple to HSL format.
+
+- Use the [RGB to HSL conversion formula](https://www.niwa.nu/2013/05/math-behind-colorspace-conversions-rgb-hsl/) to convert to the appropriate format.
+- The range of all input parameters is [0, 255].
+- The range of the resulting values is H: [0, 360], S: [0, 100], L: [0, 100].
+
+```js
+const RGBToHSL = (r, g, b) => {
+  r /= 255;
+  g /= 255;
+  b /= 255;
+  const l = Math.max(r, g, b);
+  const s = l - Math.min(r, g, b);
+  const h = s
+    ? l === r
+      ? (g - b) / s
+      : l === g
+      ? 2 + (b - r) / s
+      : 4 + (r - g) / s
+    : 0;
+  return [
+    60 * h < 0 ? 60 * h + 360 : 60 * h,
+    100 * (s ? (l <= 0.5 ? s / (2 * l - s) : s / (2 - (2 * l - s))) : 0),
+    (100 * (2 * l - s)) / 2,
+  ];
+};
+```
+
+```js
+RGBToHSL(45, 23, 11); // [21.17647, 60.71428, 10.98039]
+```