refactor: random

packages/math/package.json

@@ -34,7 +34,8 @@
     "@avocado/react": "^3.0.0",
     "@flecks/core": "^1.4.1",
     "@flecks/react": "^1.4.1",
-    "graham_scan": "^1.0.4"
+    "graham_scan": "^1.0.4",
+    "seedrandom": "^3.0.5"
   },
   "devDependencies": {
     "@flecks/fleck": "^1.4.1"

packages/math/src/index.js

@@ -9,6 +9,7 @@ export * from './math';
 export {default as floodwalk2D} from './floodwalk';
 export {default as QuadTree} from './quadtree';
 export {noise, noiseSeed} from './noise';
+export * from './random';
 export {default as Range} from './range';
 export {default as SimpleMovingAverage} from './sma';
 export * as Vertice from './vertice';

packages/math/src/math.js

@@ -24,7 +24,6 @@ export const {
   log10,
   max,
   min,
-  random,
   round,
   sign,
   sin,
@@ -79,22 +78,8 @@ export const normalizeAngleRange = (min, max) => {
   return [min, max];
   /* eslint-enable no-param-reassign */
 };
-export const randomNumber = (min, max) => {
-  if (min > max) {
-    // eslint-disable-next-line no-param-reassign
-    [max, min] = [min, max];
-  }
-  return min + Math.random() * (max - min);
-};
 // smooth(er)?step assumes unit
 export const smoothstep = (x) => x * x * (3 - 2 * x);
 export const smootherstep = (x) => x * x * x * (x * (x * 6 - 15) + 10);
-/**
- * Probabilistic behavior. Every `period` seconds, return `true`.
- *
- * @param {Number} elapsed The time that's passed.
- * @param {Number} period The frequency of probabilistic behavior.
- */
-export const spontaneous = (elapsed, period) => Math.random() < 1 / (period / elapsed);
 export const sub = (l, r) => l - r;
 export const toRad = (a) => a * PI_180;

packages/math/src/random.js

@@ -0,0 +1,27 @@
+const {alea: Alea} = require('seedrandom');
+
+let generator = new Alea(0);
+
+export function setSeed(seed) {
+  generator = new Alea(seed);
+}
+
+export function random() {
+  return generator();
+}
+
+export const randomNumber = (min, max) => {
+  if (min > max) {
+    // eslint-disable-next-line no-param-reassign
+    [max, min] = [min, max];
+  }
+  return min + random() * (max - min);
+};
+
+/**
+ * Probabilistic behavior. Every `period` seconds, return `true`.
+ *
+ * @param {Number} elapsed The time that's passed.
+ * @param {Number} period The frequency of probabilistic behavior.
+ */
+export const spontaneous = (elapsed, period) => random() < 1 / (period / elapsed);

packages/math/src/range.js

@@ -1,4 +1,4 @@
-import {randomNumber} from './math';
+import {randomNumber} from './random';
 
 export default class Range {
 

packages/math/src/vector/range.js

@@ -1,5 +1,5 @@
 import Range from '../range';
-import {randomNumber} from '../math';
+import {randomNumber} from '../random';
 
 export default class VectorRange extends Range {
 

packages/sound/package.json

@@ -30,6 +30,7 @@
     "test.js.map"
   ],
   "dependencies": {
+    "@avocado/math": "^3.0.0",
     "@avocado/react": "^3.0.0",
     "@avocado/resource": "^3.0.0",
     "@avocado/traits": "^3.0.0",

packages/sound/src/sound.js

@@ -1,3 +1,4 @@
+import {random} from '@avocado/math';
 import {JsonResource, Resource} from '@avocado/resource';
 import LRU from 'lru-cache';
 
@@ -37,7 +38,7 @@ const pull = () => {
     }
   }
   const hmi = MAX_INTERVAL / 2;
-  setTimeout(pull, Math.max(20, hmi + hmi * (Math.random() - 0.5)));
+  setTimeout(pull, Math.max(20, hmi + hmi * (random() - 0.5)));
 };
 
 if ('web' === process.env.FLECKS_CORE_BUILD_TARGET) {

packages/timing/src/lfo/modulated-property.js

@@ -1,4 +1,5 @@
 import {Property} from '@avocado/core';
+import {random} from '@avocado/math';
 import {Class, compose, EventEmitter} from '@flecks/core';
 
 import Transition from '../transition';
@@ -10,7 +11,7 @@ const Modulator = {
   },
 
   Random() {
-    return () => Math.random();
+    return () => random();
   },
 
   Sawtooth() {

packages/timing/src/traits/animated.js

@@ -1,6 +1,6 @@
 import {mapValuesAsync} from '@avocado/core';
 import {StateProperty, Trait} from '@avocado/traits';
-import {Rectangle, Vector} from '@avocado/math';
+import {random, Rectangle, Vector} from '@avocado/math';
 import {compose} from '@flecks/core';
 import mapValues from 'lodash.mapvalues';
 
@@ -282,7 +282,7 @@ export default (flecks) => class Animated extends decorate(Trait) {
     const animation = this.$$animations[currentAnimation];
     const jitterAmount = this.jitterFor(currentAnimation);
     if (jitterAmount > 0) {
-      const jitter = Math.random() * jitterAmount;
+      const jitter = random() * jitterAmount;
       const halfJitter = jitter / 2;
       // eslint-disable-next-line no-param-reassign
       elapsed += jitter - halfJitter;