//============================================================
// Event Handlers:
//============================================================
private void Asteroid_AsteroidDestroyed(Asteroid asteroid, Vector2 asteroidDeathPosition)
{
// stop tracking the asteroid as it no-longer exists
trackedAsteroids.Remove(asteroid);
// if the last asteroid was destroyed, send an alert so the next wave can begin
if (trackedAsteroids.Count == 0 && asteroid.AsteroidSize == AsteroidSizes.Small)
{
if (AllAsteroidsDestroyed != null)
{
AllAsteroidsDestroyed.Invoke();
}
return;
}
// if the asteroid was small, we don't need to do anything atm
if (asteroid.AsteroidSize == AsteroidSizes.Small)
{
return;
}
// get the new asteroid size based on the size of the one which died
AsteroidSizes newAsteroidSize = asteroid.AsteroidSize + 1;
// spawn the number of asteroids that the asteroid splits into on death
for (int i = 0; i < asteroidSplitAmount; i++)
{
// here, we are slightly adjusting the angle of velocity so the asteroids direction changes
// this is randomised so the new asteroids head in their own directions
Quaternion velocityAdjustment = Quaternion.AngleAxis(Random.Range(-MAXIMUM_VELOCITY_ADJUSTMENT, MAXIMUM_VELOCITY_ADJUSTMENT), asteroid.transform.forward);
Vector3 adjustedVelocity = velocityAdjustment * asteroid.AsteroidVelocity;
SpawnNewAsteroid(newAsteroidSize, asteroidDeathPosition, adjustedVelocity * ASTEROID_VELOCITY_MODIFIER);
}
}
//============================================================
// Private Methods:
//============================================================
private void SpawnNewAsteroid(AsteroidSizes newAsteroidSize, Vector2 newAsteroidSpawnPosition, Vector2 newAsteroidVelocity)
{
// find a random asteroid based on the size of asteroid we are to spawn
Asteroid newAsteroid = null;
switch (newAsteroidSize)
{
case AsteroidSizes.Large:
newAsteroid = largeAsteroids[Random.Range(0, largeAsteroids.Count)];
break;
case AsteroidSizes.Medium:
newAsteroid = mediumAsteroids[Random.Range(0, mediumAsteroids.Count)];
break;
case AsteroidSizes.Small:
newAsteroid = smallAsteroids[Random.Range(0, smallAsteroids.Count)];
break;
}
// if we reach this point and the asteroid is still null, something has gone wrong and it must be corrected
if (newAsteroid == null)
{
throw new Exception("The asteroid was not initialised correctly.");
}
// generate some random values for spawn offset and starting rotation for a bit of variety with the asteroids
Vector2 asteroidSpawnOffset = Random.insideUnitCircle * ASTEROID_SPAWN_MODIFIER;
Quaternion asteroidStartingRotation = Quaternion.Euler(new Vector3(0, 0, Random.Range(0, 360)));
// instantiate the new asteroid, initialise it, then begin to track it
newAsteroid = Instantiate(newAsteroid, newAsteroidSpawnPosition + asteroidSpawnOffset, asteroidStartingRotation, spawnedAsteroidsContainer);
newAsteroid.Init(newAsteroidSize, newAsteroidVelocity);
trackedAsteroids.Add(newAsteroid);
}
//Returns a random asteroid prefab of the specified size
private GameObject GetAsteroidPrefab(AsteroidSizes Size)
{
//Select one of the prefabs of the specified size at random
int MaxSelection = Size == AsteroidSizes.Small ? 5 : 2;
int Selection = Random.Range(0, MaxSelection);
//Return it from the prefab list
return(Size == AsteroidSizes.Small ? SmallPrefabs[Selection] :
Size == AsteroidSizes.Medium ? MediumPrefabs[Selection] :
LargePrefabs[Selection]);
}
//Spawns an asteroid at a specified location
public void SpawnAsteroid(AsteroidSizes Size, Vector3 Location)
{
//Ignore this function call if there is already the maximum number of asteroids active
if (ActiveAsteroids.Count > MaxAsteroidCount)
{
return;
}
//Select one of the prefabs of the given size at random, and spawn it in at the given location
GameObject RandomPrefab = GetAsteroidPrefab(Size);
Quaternion RandomRotation = Quaternion.Euler(0f, 0f, Random.Range(-360f, 360f));
GameObject AsteroidSpawn = Instantiate(RandomPrefab, Location, RandomRotation);
//Add it to the tracking list with all the others
ActiveAsteroids.Add(AsteroidSpawn);
}
public void playAsteroidCollision(AsteroidSizes size)
{
switch (size)
{
case AsteroidSizes.Small:
playSmallAsteroid();
break;
case AsteroidSizes.Medium:
playMediumAsteroid();
break;
case AsteroidSizes.Large:
playLargeAsteroid();
break;
}
}
//Spawns 2 smaller sizes asteroids near the previous ones location
private void SpawnFragments(AsteroidSizes Size, Vector3 SpawnPos)
{
//Ignore this function call if the maximum amount of asteroids already exist
if (ActiveAsteroids.Count >= MaxAsteroidCount)
{
return;
}
//Get a random direction to offset the spawns from the destroyed asteroids previous location
Vector3 SpawnDirection = new Vector3(Random.Range(-1f, 1f), Random.Range(-1f, 1f), 0f).normalized;
//Get two locations where each fragment will be spawned in at
Vector3 FirstSpawnPos = SpawnPos + SpawnDirection * (Size == AsteroidSizes.Medium ? HalfMediumSpaceNeeded : HalfSmallSpaceNeeded);
Vector3 SecondSpawnPos = SpawnPos - SpawnDirection * (Size == AsteroidSizes.Medium ? HalfMediumSpaceNeeded : HalfSmallSpaceNeeded);
//When the fragments are spawned in, they should be pushed away from the point of the explosion
Vector3 FirstSpawnExplosionDirection = Vector3.Normalize(FirstSpawnPos - SpawnPos);
float FirstSpawnExplosionForce = Random.Range(FragmentExplosionForce.x, FragmentExplosionForce.y);
Vector3 SecondSpawnExplosionDirection = Vector3.Normalize(SecondSpawnPos - SpawnPos);
float SecondSpawnExplosionForce = Random.Range(FragmentExplosionForce.x, FragmentExplosionForce.y);
//Get two random rotations to apply to the asteroids when spawning them in
Quaternion FirstSpawnRotation = Quaternion.Euler(0f, 0f, Random.Range(-360f, 360f));
Quaternion SecondSpawnRotation = Quaternion.Euler(0f, 0f, Random.Range(-360f, 360f));
//Grab random prefabs to spawn in for each fragment
GameObject FirstPrefab = GetAsteroidPrefab(Size);
GameObject SecondPrefab = GetAsteroidPrefab(Size);
//Spawn in the first prefab and add it to the tracking list with all the others
GameObject FirstSpawn = Instantiate(FirstPrefab, FirstSpawnPos, FirstSpawnRotation);
FirstSpawn.GetComponent <AsteroidDrift>().ApplyExplosionForce(FirstSpawnExplosionDirection * FirstSpawnExplosionForce);
ActiveAsteroids.Add(FirstSpawn);
//Spawn and track the 2nd prefab if adding the first one didnt cause us to reach the max asteroid count
if (ActiveAsteroids.Count < MaxAsteroidCount)
{
GameObject SecondSpawn = Instantiate(SecondPrefab, SecondSpawnPos, SecondSpawnRotation);
SecondSpawn.GetComponent <AsteroidDrift>().ApplyExplosionForce(SecondSpawnExplosionDirection * SecondSpawnExplosionForce);
ActiveAsteroids.Add(SecondSpawn);
}
}
//Destroys an asteroid and removes it from the active list, continues to the next level if there are no asteroids left
public void DestroyAsteroid(GameObject Asteroid)
{
//Remove the asteroid from the active tracking list
if (ActiveAsteroids.Contains(Asteroid))
{
ActiveAsteroids.Remove(Asteroid);
}
//Store the asteroids size and position, then destroy it
AsteroidSizes AsteroidSize = Asteroid.GetComponent <AsteroidSize>().MySize;
Vector3 AsteroidPos = Asteroid.transform.position;
Destroy(Asteroid);
//If the asteroid was large or medium, spawn a couple smaller asteroids nearby the destroyed asteroids location
if (AsteroidSize == AsteroidSizes.Large)
{
SpawnFragments(AsteroidSizes.Medium, AsteroidPos);
}
else if (AsteroidSize == AsteroidSizes.Medium)
{
SpawnFragments(AsteroidSizes.Small, AsteroidPos);
}
//Play sound effect and award points for destroying the asteroid
SoundEffectsPlayer.Instance.PlaySound("AsteroidDestroy");
GameState.Instance.IncreaseScore((int)(AsteroidSize == AsteroidSizes.Large ? ScoreValues.LargeAsteroid :
AsteroidSize == AsteroidSizes.Medium ? ScoreValues.MediumAsteroid :
ScoreValues.SmallAsteroid));
//Continue onto the next level if they are no more asteroids left
if (ActiveAsteroids.Count <= 0)
{
GameState.Instance.NextLevel();
}
}
