Improve Beat Detection

boilerbloat/src/patterns/chaser.ts

@@ -3,30 +3,15 @@ import { Pattern, PatternOutput, Time } from './proto';
 
 export class ChaserPattern implements Pattern {
 
-  lastBeat: number;
-  lastTime: number;
-
-  constructor() {
-    this.lastBeat = 0;
-    this.lastTime = 0;
-  }
-
   render(time: Time): PatternOutput {
 
     if (time.beatRelative === null) {
-      this.lastBeat = 0;
       return null;
     }
 
     let t = time.beatRelative;
 
-    if (t < this.lastTime) {
-      this.lastBeat += 1;
-    }
-
-    this.lastTime = t;
-
-    let head_number = this.lastBeat % 4;
+    let head_number = Math.floor(t % 4);
 
     let template: MovingHeadState = {
       startAddress: 0,
@@ -44,7 +29,7 @@ export class ChaserPattern implements Pattern {
     let result = [];
 
     for (let [i, startAddress] of [1, 15, 29, 43].entries()) {
-      result[i] = { ...template};
+      result[i] = { ...template };
       result[i].startAddress = startAddress;
 
       if (i === head_number) {