core: split: game and pong

frontend/static/js/api/game/pong/Time.js

@@ -0,0 +1,42 @@
+
+
+class Time
+{
+    constructor()
+    {
+        /**
+         * @type {Number}
+         */
+        this._lastFrame = undefined;
+
+        /**
+         * @type {Number}
+         */
+        this._currentFrame = undefined;
+    }
+
+    deltaTime()
+    {
+        if (this._lastFrame === undefined)
+            return 0;
+        return (this._currentFrame - this._lastFrame);
+    }
+
+    deltaTimeSecond()
+    {
+        return this.deltaTime() / 1000;
+    }
+
+    get_fps()
+    {
+        return 1 / this.deltaTimeSecond();
+    }
+
+    new_frame()
+    {
+        this._lastFrame = this._currentFrame;
+        this._currentFrame = Date.now();
+    }
+}
+
+export { Time };