From e64d3c620fdef0c15259cf955466cb040d02e958 Mon Sep 17 00:00:00 2001
From: brunosimon <simon.bruno.77@gmail.com>
Date: Tue, 5 Sep 2017 00:19:22 +0200
Subject: [PATCH] :lipstick: Chat > Improve colors

---
 lib/chat.js | 62 +++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 58 insertions(+), 4 deletions(-)

diff --git a/lib/chat.js b/lib/chat.js
index 831a881..babe7cf 100644
--- a/lib/chat.js
+++ b/lib/chat.js
@@ -153,14 +153,68 @@ class Chat
 
     getRandomColor()
     {
-        const r = (Math.round(Math.random() * 127) + 127).toString(16)
-        const g = (Math.round(Math.random() * 127) + 127).toString(16)
-        const b = (Math.round(Math.random() * 127) + 127).toString(16)
-        const color = '#' + r + g + b
+        const rgb = this.hslToRgb(Math.random(), 0.5, 0.5)
+
+        rgb[0] = Math.round(rgb[0] * 0.7 + 255 * 0.3).toString(16)
+        rgb[1] = Math.round(rgb[1] * 0.7 + 255 * 0.3).toString(16)
+        rgb[2] = Math.round(rgb[2] * 0.7 + 255 * 0.3).toString(16)
+
+        const color = `#${rgb[0]}${rgb[1]}${rgb[2]}`
 
         return color
     }
 
+    hslToRgb(h, s, l)
+    {
+        let r
+        let g
+        let b
+
+        if(s === 0)
+        {
+            r = g = b = l
+        }
+        else
+        {
+            const hue2rgb = function hue2rgb(_p, _q, _t)
+            {
+                let t = _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
+            }
+
+            const q = l < 0.5 ? l * (1 + s) : l + s - l * s
+            const 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)]
+    }
+
     getRandomName()
     {
         // Refill robot names if no more name available