How to spawn object when the Count of that object is 0

Question

Hello, I'm learning how to code simple snake game from (https://noobtuts.com/unity/2d-snake-game). I'm trying to spawn a food when the foodCount = 0 but it doesn't spawn it. What is wrong with the code?

in SpawnFood.cs:

public class SpawnFood : MonoBehaviour {

 public GameObject foodPrefab;

 private static int foodCount = 0;
 private const int maxFoodCountInScene = 4;

 public static void EatOne()
 {
     if (foodCount >= 1)
     {
         foodCount--;
     }
 }

 // Start is called before the first frame update
 private void Start()
 {
     InvokeRepeating("Spawn", 3, 4);
 }

 private void Spawn()
 {
     if (GameController.isPaused) return;

     int x = (int)UnityEngine.Random.Range(borderLeft.position.x, borderRight.position.x);
     int y = (int)UnityEngine.Random.Range(borderBottom.position.y, borderTop.position.y);

     if ( ( foodCount < maxFoodCountInScene) || (Convert.ToInt32(foodCount) == 0) )  
     {
         Instantiate(foodPrefab, new Vector2(x, y), Quaternion.identity);
         foodCount++;
     }
 }

and In Snake.cs:

     public class Snake : MonoBehaviour{
 .
 .
 .
 .
 .
 .
 
 .
         private void OnTriggerEnter2D(Collider2D collision)
         {
             if (collision.name.StartsWith("Food"))
             {
                 ate = true;
                 Destroy(collision.gameObject);
                 SpawnFood.EatOne();
             }
             else if(collision.tag.Contains("Border"))
             {
                 GameController.FailGame();
                 //TODO:YOU LOSE SCREEN
             }
         }
     }

Answer 1

Answer by oTaijjo · Nov 30, 2019 at 11:50 AM

If you really only want to spawn food, when foodCount is 0, then you need to change this line

 if ( ( foodCount < maxFoodCountInScene) || (Convert.ToInt32(foodCount) == 0) )

to this

 if (  foodCount == 0 )

In your version you're saying: 'spawn food, when foodCount is smaller than maxFoodCountInScene (i.e. 4) OR if foodcount is 0'.

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YJ8 · Nov 30, 2019 at 09:52 PM 0

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I wanted both, spawn when less than 4 (max of food is 4 is game) and when its 0 , spawn food.. But when food is 0, it doesnt spawn in game. I suspect it has to do with my counter not working properly or i can't do that with invoke-repeating

Larry-Dietz YJ8 · Nov 30, 2019 at 11:19 PM 1

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Technically, that 2nd check for 0 is redundant. 0 is less than maxFoodCountInScene, presumably, so it should spawn at any number smaller than maxFoodCountInScene, including 0

If you think your count is somehow getting off, add a Debug.Log to the Spawn routine.

Something like this... Debug.Log("Current Food Count: "+foodCount+" $$anonymous$$ax food allowed: "+maxFoodCountInScene);

That way you can look in the console and see if the numbers are what you expected them to be.

YJ8 Larry-Dietz · Dec 01, 2019 at 06:38 PM 0

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I just debug and check my count and its working. It's spawning but because i used invoke repeating every 4 sec, it only spawn after 4 sec. What I want is for it to spawn every 4 sec and when its 0 foodCount spawn immediately. Can i do that with invoke-repeating or do I have to used invoke or other method?

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How to spawn object when the Count of that object is 0

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