Merge branch 'prng-seed' into 'master'

Prng seed

See merge request panki/bingo!2

script.js

@@ -52,14 +52,19 @@ let fields = [
 
 const FREE_FIELD_TEXT = "Freies Parken"
 
+const seed = Date.now().toString();
+var prng_hash_seed = cyrb128(seed);
+let rand = sfc32(prng_hash_seed[0], prng_hash_seed[1], prng_hash_seed[2], prng_hash_seed[3]);
+
 let shuffled = fields
-  .map(value => ({ value, sort: Math.random() }))
+  .map(value => ({ value, sort: rand() }))
   .sort((a, b) => a.sort - b.sort)
   .map(({ value }) => value)
 
 shuffled.splice(12, 0, FREE_FIELD_TEXT);
 
 function generateTable() {
+
   let table = document.querySelector("table");
   let thead = table.createTHead();
   let row = null;//thead.insertRow();
@@ -94,7 +99,52 @@ function generateTable() {
   });
 }
 
+// hash function, thx stackoverflow :3
+function cyrb128(str) {
+    let h1 = 1779033703, h2 = 3144134277,
+        h3 = 1013904242, h4 = 2773480762;
+    for (let i = 0, k; i < str.length; i++) {
+        k = str.charCodeAt(i);
+        h1 = h2 ^ Math.imul(h1 ^ k, 597399067);
+        h2 = h3 ^ Math.imul(h2 ^ k, 2869860233);
+        h3 = h4 ^ Math.imul(h3 ^ k, 951274213);
+        h4 = h1 ^ Math.imul(h4 ^ k, 2716044179);
+    }
+    h1 = Math.imul(h3 ^ (h1 >>> 18), 597399067);
+    h2 = Math.imul(h4 ^ (h2 >>> 22), 2869860233);
+    h3 = Math.imul(h1 ^ (h3 >>> 17), 951274213);
+    h4 = Math.imul(h2 ^ (h4 >>> 19), 2716044179);
+    return [(h1^h2^h3^h4)>>>0, (h2^h1)>>>0, (h3^h1)>>>0, (h4^h1)>>>0];
+}
+
+function sfc32(a, b, c, d) {
+    return function() {
+      a >>>= 0; b >>>= 0; c >>>= 0; d >>>= 0; 
+      var t = (a + b) | 0;
+      a = b ^ b >>> 9;
+      b = c + (c << 3) | 0;
+      c = (c << 21 | c >>> 11);
+      d = d + 1 | 0;
+      t = t + d | 0;
+      c = c + t | 0;
+      return (t >>> 0) / 4294967296;
+    }
+}
+
+function mulberry32(a) {
+    return function() {
+      var t = a += 0x6D2B79F5;
+      t = Math.imul(t ^ t >>> 15, t | 1);
+      t ^= t + Math.imul(t ^ t >>> 7, t | 61);
+      return ((t ^ t >>> 14) >>> 0) / 4294967296;
+    }
+}
+
+
 generateTable();
 const center_field = document.querySelector('#center-field');
 center_field.innerHTML = '<img src="img/7-vs-wild-logo.svg" alt="7 vs. Wild Logo"></img>'
 
+let seed_elem = document.createElement('p');
+seed_elem.innerText = seed;
+document.body.appendChild(seed_elem);

style.css

@@ -18,7 +18,8 @@ img {
   width: 100%;
 }
 
-h1 {
+h1, p {
   font-family: Arial, Helvetica, sans-serif;
   text-align: center;
+  margin: 5px;
 }