changed ball and bar for a sprite

assets/js/Resources.js

@@ -0,0 +1,26 @@
+class Resources {
+    constructor() {
+        this.total = 0;
+        this.loading = 0;
+        this.resources = {};
+
+        this.load('ball');
+        this.load('bar');
+    }
+
+
+    load(res) {
+        let _this = this;
+        this.total++;
+        this.loading++;
+        this.resources[res] = new Image();
+        this.resources[res].onload = function () {
+            _this.loading--;
+        }
+        this.resources[res].src = 'assets/imgs/' + res + '.png';
+    }
+
+    get(res) {
+        return this.resources[res];
+    }
+};