void FixedUpdate()
{
// check if can spawn
if (timeSinceSpawn >= spawnrate && spawn && enemyCount < maxEnemies)
{
// spawn a random enemy at random position determined by random radius + random angle
float spawnRadius = Random.Range(minSpawnRadius, maxSpawnRadius);
float spawnAngle = Random.Range(0f, 360f) * Mathf.Deg2Rad;
// convert to coordinates
Vector2 offset;
offset.x = Mathf.Cos(spawnAngle) * spawnRadius;
offset.y = Mathf.Sin(spawnAngle) * spawnRadius;
// spawn the enemy and reset counter
GameObject clone = Instantiate(enemyPrefab, playerRB.position + offset, Quaternion.identity);
timeSinceSpawn = 0f;
// Detect when an ennemy gets destroyed
DestroyEventEmitter destroyEventEmitter = clone.AddComponent <DestroyEventEmitter>();
destroyEventEmitter.OnObjectDestroyedEvent += OnGameObjectDestroyed;
enemyCount++;
}
else if (timeSinceSpawn < spawnrate)
{
timeSinceSpawn += 1f;
}
}
private void OnGameObjectDestroyed(DestroyEventEmitter emitter)
{
remainingEnemies--;
emitter.OnObjectDestroyedEvent -= OnGameObjectDestroyed;
if (remainingEnemies <= 0)
{
remainingEnemies = 3;
SpawnObjects();
}
}
private IEnumerator SpawnObjects()
{
WaitForSeconds wait = new WaitForSeconds(spawnDelay);
// Initial wait for the first spawn
yield return(new WaitForSeconds(spawnTime));
for (int x = spawnCount; x > 0; --x)
{
// this uses a random number generator to pick from the list of six options
int y = UnityEngine.Random.Range(1, 6);
if (y == 1)
{
GameObject newBody = Instantiate(prefabA, transform.position, transform.rotation);
}
if (y == 2)
{
GameObject newBody = Instantiate(prefabB, transform.position, transform.rotation);
}
if (y == 3)
{
GameObject newBody = Instantiate(prefabC, transform.position, transform.rotation);
}
if (y == 4)
{
GameObject newBody = Instantiate(prefabD, transform.position, transform.rotation);
}
if (y == 5)
{
GameObject newBody = Instantiate(prefabE, transform.position, transform.rotation);
}
if (y == 6)
{
GameObject newBody = Instantiate(prefabF, transform.position, transform.rotation);
}
if (y <= 0 | y > 6)
{
GameObject newBody = Instantiate(prefabA, transform.position, transform.rotation);
}
// Detect when an enemy gets destroyed, emitter mechanics, I will admit I am new to realtime applications
// this adds an emitter to the items spawned to allow a listen event for destruction
DestroyEventEmitter destroyEventEmitter = newBody.AddComponent <DestroyEventEmitter>();
destroyEventEmitter.OnObjectDestroyedEvent += OnGameObjectDestroyed;
remainingEnemies++;
// Wait before next spawn prior to spawning again
yield return(wait);
}
}
private void OnGameObjectDestroyed(DestroyEventEmitter emitter)
{
enemyCount--;
emitter.OnObjectDestroyedEvent -= OnGameObjectDestroyed;
}
