add the cube master

public/the-cube-master/src/js/Animation.js

@@ -0,0 +1,88 @@
+const animationEngine = ( () => {
+
+  let uniqueID = 0;
+
+  class AnimationEngine {
+
+    constructor() {
+
+      this.ids = [];
+      this.animations = {};
+      this.update = this.update.bind( this );
+      this.raf = 0;
+      this.time = 0;
+
+    }
+
+    update() {
+
+      const now = performance.now();
+      const delta = now - this.time
+      this.time = now;
+
+      let i = this.ids.length;
+
+      this.raf = i ? requestAnimationFrame( this.update ) : 0;
+
+      while ( i-- )
+        this.animations[ this.ids[ i ] ] && this.animations[ this.ids[ i ] ].update( delta );
+
+    }
+
+    add( animation ) {
+
+      animation.id = uniqueID ++;
+
+      this.ids.push( animation.id );
+      this.animations[ animation.id ] = animation;
+
+      if ( this.raf !== 0 ) return;
+
+      this.time = performance.now();
+      this.raf = requestAnimationFrame( this.update );
+
+    }
+
+    remove( animation ) {
+
+      const index = this.ids.indexOf( animation.id );
+
+      if ( index < 0 ) return;
+
+      this.ids.splice( index, 1 );
+      delete this.animations[ animation.id ];
+      animation = null;
+
+    }
+
+  }
+
+  return new AnimationEngine();
+
+} )();
+
+class Animation {
+
+  constructor( start ) {
+
+    if ( start === true ) this.start();
+
+  }
+
+  start() {
+
+    animationEngine.add( this );
+
+  }
+
+  stop() {
+
+    animationEngine.remove( this );
+
+  }
+
+  update( delta ) {}
+
+}
+
+export { Animation };