using UnityEngine;
  using System.Collections;
  
  public class MovingObject{
      public DirectionEnum direction; //-1 or 1;
      public Transform transform;
  
      public MovingObject(DirectionEnum dir, Transform trans)
      {
          direction = dir;
          transform = trans;
      }
      
  }
  
  [System.Serializable]
  public enum DirectionEnum{left = -1, right= 1}
  
  public class ObjectSpawner : MonoBehaviour {
  
      public Transform objectPrefab;
      public DirectionEnum spawnDirection = DirectionEnum.right;
      public static ObjectSpawner SP;
  
      private float farLeft;
      private float farRight;    
      private float lastSpawnTime;
      private float spawnInterval;   
  
          void Awake () {
          SP = this;
          
          spawnInterval = Random.Range(3.5f, 5.5f);
          lastSpawnTime = Time.time + Random.Range(0.0f, 1.5f);
          }
  
      
          void Update () {
          //Spawn new object..
          if ((lastSpawnTime + spawnInterval) < Time.time)
          {
              SpawnObject();
          }      
          }
  
     
  
      void SpawnObject()
      {        
          lastSpawnTime = Time.time;
          spawnInterval *= 0.99f;//Speed up spawning
  
          DirectionEnum direction = spawnDirection; //-1 or 1
  
          Transform newObj = (Transform)Instantiate(objectPrefab, transform.position, transform.rotation);
          MovingObject movObj = new MovingObject(direction, newObj);        
          GameManager.SP.AddTarget( movObj );
  
      }
  
   
  }