new structure, spawner, rebind

assets/Scripts/Services/GameTimer.ts

@@ -0,0 +1,21 @@
+export class GameTimer {
+    private targetDelay: number;
+    private currentDelay = 0;
+
+    public constructor(targetDelay: number) {
+        this.targetDelay = targetDelay;
+    }
+
+    public gameTick(deltaTime: number): void {
+        this.currentDelay += deltaTime;
+    }
+
+    public tryFinishPeriod(): boolean {
+        if (this.targetDelay <= this.currentDelay) {
+            this.currentDelay = 0;
+            return true;
+        } else {
+            return false;
+        }
+    }
+}