/// <summary>
/// Blow up the asteroid. This will possibly create debris,
/// meaning that if the asteroid is big enough it will spawn a few smaller asteroids in its place.
/// The original asteroid will disappear regardless of the number of created debris.
/// </summary>
private void Destruct()
{
int minDebrisCount = Mathf.RoundToInt(minDebrisCountToRadiusRatio * radius);
int maxDebrisCount = Mathf.RoundToInt(maxDebrisCountToRadiusRatio * radius);
int debrisCount = Random.Range(minDebrisCount, maxDebrisCount);
if (debrisCount > 1)
{
float debrisRadius = radius / Mathf.Sqrt(debrisCount);
float debrisSeparationAngle = 2f * Mathf.PI * Random.value;
float debrisSeparationVelocity = Random.Range(minDebrisSeparationVelocity, maxDebrisSeparationVelocity);
for (int i = 0; i < debrisCount; i++)
{
debrisSeparationAngle += 2f * Mathf.PI / debrisCount;
Vector2 debrisDirection = Quaternion.Euler(0f, 0f, Mathf.Rad2Deg * debrisSeparationAngle) * Vector2.right;
GameObject debrisGO = Instantiate
(
gameObject,
transform.position + (Vector3)(debrisSeparationDistanceMultiplier * debrisRadius * debrisDirection),
Quaternion.identity
);
Asteroid debris = debrisGO.GetComponent <Asteroid>();
debris.Init(debrisRadius);
Rigidbody2D debrisRigidbody = debrisGO.GetComponent <Rigidbody2D>();
debrisRigidbody.velocity = rigidbody2D.velocity + debrisSeparationVelocity * debrisDirection;
debrisRigidbody.angularVelocity = rigidbody2D.angularVelocity;
}
}
Vanish();
}
/// <summary>
/// Spawn a new random-sized asteroid and push it in the direction of a random spot in the play area.
/// </summary>
private void SpawnNewAsteroid()
{
Vector3 position = GetRandomPositionOnRectPerimeter(spawnRect);
Vector3 targetPosition = GetRandomPositionInRect(movementTargetRect);
GameObject asteroidGO = Instantiate
(
asteroidPrefab,
position,
Quaternion.identity
);
Asteroid asteroid = asteroidGO.GetComponent <Asteroid>();
asteroid.Init();
asteroid.Push(targetPosition - position);
}