About 'Spawn Attackers Using Coroutine'!

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1

In this video (objectives)...

  1. Instantiate attackers at intervals within a random range.
  2. Use a coroutine to continue spawning attackers.
  3. Create a spawning bool that allows us to stop the attacker spawning when needed.

After watching (learning outcomes)...

Spawn attackers along their lanes using coroutine.

(Unique Video Reference: 12_GL_CUD)

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2

Hi!

I think it could be great to explain difference between using a coroutine in a void Start() and using an IEnumerator Start(), because it can be a bit confusing what are advantages of using one over the other.

-Aurelien

3

So when you said we had a meaty challenge to complete this lecture, I definitely built my spawner to interact with a scriptable object

[CreateAssetMenu(menuName = "Enemy Wave Config")]
public class WaveConfig : ScriptableObject
{
    [SerializeField] GameObject enemyPrefab;
    [SerializeField] int numberOfEnemies = 1;
    [SerializeField] float minSpawnTime = 1f;
    [SerializeField] float maxSpawnTime = 5f;

    public GameObject GetEnemyPrefab() { return enemyPrefab; }

    public int GetNumberOfEnemies() { return numberOfEnemies; }

    public float GetMinSpawnTime() { return minSpawnTime; }

    public float GetMaxSpawnTime() { return maxSpawnTime; }

}

public class AttackerSpawner : MonoBehaviour
{

    [SerializeField] List<WaveConfig> waveConfig;
    [SerializeField] int startingWave = 0;
    [SerializeField] bool looping = true;

	// Use this for initialization
	IEnumerator Start ()
    {
        do
        {
            yield return StartCoroutine(SpawnAllWaves());
        }
        while (looping);
	}

    private IEnumerator SpawnAllWaves()
    {
        for (int waveIndex = startingWave; waveIndex < waveConfig.Count; waveIndex++)
        {
            var currentWave = waveConfig[waveIndex];
            yield return StartCoroutine(SpawnEnemiesInWave(currentWave));
        }
    }

    private IEnumerator SpawnEnemiesInWave(WaveConfig waveConfigs)
    {
        for (int enemyCount = 0; enemyCount < waveConfigs.GetNumberOfEnemies(); enemyCount++)
        {
            var newEnemy = Instantiate(waveConfigs.GetEnemyPrefab(), this.transform.position, Quaternion.identity);
            yield return new WaitForSeconds(Random.Range(waveConfigs.GetMinSpawnTime(), waveConfigs.GetMaxSpawnTime()));
        }
    }
	
	// Update is called once per frame
	void Update ()
    {
		
	}
}

This approach shouldn’t be a problem in future lectures correct? I like to try and branch a little bit from coding portions of the lecture as much as I comfortably can to better understand C#

4

Hi all,

Like Vincent, I too took on the coding challenge with my own take. Instead of creating multiple Spawner game objects, I defined co-ordinates corresponding to each row in my script.

public class AttackerSpawner : MonoBehaviour
{
bool spawn = true;
[SerializeField] GameObject lizardPrefab;
[SerializeField] float minSpawnDelay = 1f;
[SerializeField] float maxSpawnDelay = 5f;

//row co-ords
Vector2 row1 = new Vector2(10f, 5.35f);
Vector2 row2 = new Vector2(10f, 4.35f);
Vector2 row3 = new Vector2(10f, 3.35f);
Vector2 row4 = new Vector2(10f, 2.35f);
Vector2 row5 = new Vector2(10f, 1.35f);
List<Vector2> rowsList = new List<Vector2>();

// Start is called before the first frame update
void Start()
{
    AddRowsToList();
    StartCoroutine(SpawnLizards());
}

private IEnumerator SpawnLizards()
{
    while (spawn)
    {
        yield return new WaitForSecondsRealtime(Random.Range(minSpawnDelay, maxSpawnDelay));
        int randomRow = Random.Range(0, 5);
        SpawnLizard(rowsList[randomRow]);
    }
}

private void SpawnLizard(Vector2 row)
{
    Instantiate(lizardPrefab, row, Quaternion.identity);
}

private void AddRowsToList()
{
    rowsList.Add(row1);
    rowsList.Add(row2);
    rowsList.Add(row3);
    rowsList.Add(row4);
    rowsList.Add(row5);
}

}