/// <summary>
/// [COROUTINE] called by effects to spawn enemies mid-wave
/// </summary>
/// <param name="wave">the wave to spawn</param>
/// <param name="spawnLocation">where to spawn it</param>
/// <param name="firstDestination">the first location for them to travel to before pathfinding. This should be the start or end of a path segment.</param>
public IEnumerator spawnWaveAt(WaveData wave, Vector2 spawnLocation, Vector2 firstDestination)
{
//flag the wave as started
wavesSpawning++;
totalSpawnCount += wave.spawnCount;
//init
float timeBetweenSpawns = wave.time / wave.spawnCount; //delay between each spawn
SpawnerScript spawner = ((GameObject)Instantiate(spawnerPrefab)).GetComponent <SpawnerScript>();
spawner.forceFirstPath(spawnLocation, firstDestination);
//slight delay before spawning
yield return(new WaitForSeconds(0.1f));
//spawn monsters.
float timeToNextSpawn = 0;
while ((wave.spawnCount - wave.spawnedThisWave) > 0)
{
yield return(null); //wait for the next frame
timeToNextSpawn -= Time.deltaTime; //reduce time until next spawn by amount of time between frames
wave.time -= Time.deltaTime; //update the wave data also so that the status text can update
while (timeToNextSpawn < 0.0) //this is a loop in case multiple spawns happen in one frame
{
spawner.Spawn(-timeToNextSpawn, wave.enemyData); //spawn enemy. spawn timer provided so the enemy can place itself properly when framerate is low
timeToNextSpawn += timeBetweenSpawns; //update spawn timer
//update spawn counters
wave.spawnedThisWave++;
totalSpawnedThisWave++;
//bail if we have finished spawning baddies
if (wave.spawnedThisWave == wave.spawnCount)
{
break;
}
}
}
//wave is over
wavesSpawning--;
Destroy(spawner.gameObject);
yield break;
}