// Adds new asteroids to the scene for the wave
private void SpawnAsteroids()
{
DestroyExistingAsteroids(); // remove old asteroids, but there shouldn't be any.
numAsteroids = 4 + wave; // asteroid number increases with each wave
for (int i = 0; i < numAsteroids; i++)
{
GameObject newAsteroidTemp = Instantiate(asteroidLarge);
newAsteroidTemp.GetComponent <AsteroidController>().SetHasBeenInside(false);
// this makes sure the code knows that it is coming from outside the screen area
BorderShift bs = newAsteroidTemp.GetComponent <BorderShift>();
bs.ForceInit();
// I don't like doing this, but when the game starts the border shift hasn't derived screen space info yet
float minDist = bs.GetDiagonalDistance(); // distance from centre of screen to the corner
Vector2 startPosition = GetAsteroidStartPosition(i, Random.Range(minDist + 2, minDist + 5)); // distributed start position with randomised distance
newAsteroidTemp.transform.position = new Vector3(startPosition.x, startPosition.y, 0);
float rotationTempDegrees = GetAsteroidStartRotation(startPosition, new Vector2(Random.Range(-3, 3), Random.Range(-3, 3)));
newAsteroidTemp.transform.Rotate(0, 0, rotationTempDegrees);
// rotate the asteroid so it points towards the target
newAsteroidTemp.GetComponent <AsteroidController>().InitMovement();
// this randomised velocity and angular momentum of the asteroid
newAsteroidTemp.transform.SetParent(asteroidHolder.transform); // add to the asteroid holder gameobject
}
}
void Start()
{
// grab the relevant components
borderShift = GetComponent <BorderShift>();
rb = GetComponent <Rigidbody2D>();
pc = GetComponent <PolygonCollider2D>();
GameObject gameControllerObject = GameObject.FindWithTag("gameController");
gameController = gameControllerObject.GetComponent <GameController>();
}
