/// <summary>
/// initializes and returns an Asteroid.
/// </summary>
/// <param name="position">starting position of the asteroid.</param>
/// <param name="direction">Seed value for new random direction.</param>
/// <param name="speed">Seed value for new random speed.</param>
/// <param name="asteroidType">Asteroid type to generate.</param>
/// <returns>A new Asteroid instance.</returns>
/// <remarks>
/// The direction and speed of the asteroid is randomized, but is
/// based on the passed values.
/// </remarks>
public Asteroid generateAsteroid(Vector2 position, Vector2 direction, float speed, string asteroidType)
{
Asteroid spawnedAsteroid = new Asteroid();
//position needs to vary based on screen resolution
//randomize direction - rather than accepting a direction should do it all here
int randomNumber = rand.Next(4);
if (randomNumber == 3)
direction.X = direction.X * -1;
else if(randomNumber == 2)
direction.X = direction.Y * -1;
else if (randomNumber == 1)
{
direction.X = direction.X * -1;
direction.Y = direction.Y * -1;
}//for 0 we will leave it alone
randomNumber = rand.Next(10);
if (randomNumber > 6)
speed += rand.Next((int)speed);
else if(randomNumber > 2)
speed -= rand.Next((int)(speed+1)/2);
//and leave speed alone otherwise
if (asteroidType == Asteroid.ASTEROID_TYPE)
{
spawnedAsteroid.texture2D = asteroid;
spawnedAsteroid.type = Asteroid.ASTEROID_TYPE;
}
else if (asteroidType == Asteroid.SMALL_ASTEROID_TYPE)
{
spawnedAsteroid.texture2D = smallAsteroid;
spawnedAsteroid.type = Asteroid.SMALL_ASTEROID_TYPE;
}
else //tiny type
{
spawnedAsteroid.texture2D = tinyAsteroid;
spawnedAsteroid.type = Asteroid.TINY_ASTEROID_TYPE;
}
spawnedAsteroid.init(position, direction, speed, 100, true);
return spawnedAsteroid;
}
/// <summary>
/// Destroys passed Asteroid
/// </summary>
/// <param name="deadAsteroid">An asteroid doomed to die.</param>
/// <remarks>
/// This method is called when game state indicates and asteroid
/// should no longer be an active part of the game. This method
/// also generates child asteroids if appropriate based on a 'dead'
/// asteroids size.
/// </remarks>
public void destroyAsteroid(Asteroid deadAsteroid)
{
//I believe setting isActive is now redundent due to some changes I've made
deadAsteroid.isActive = false;
asteroidExplosion.Play();
if (deadAsteroid.type == Asteroid.ASTEROID_TYPE)
{
score += 100;
for (int i = 0; i < 4; i++)
{
entityList.Add(generateAsteroid(deadAsteroid.position, deadAsteroid.velocityDirection, deadAsteroid.velocityMagnitude, Asteroid.SMALL_ASTEROID_TYPE));
}
}
else if (deadAsteroid.type == Asteroid.SMALL_ASTEROID_TYPE)
{
score += 50;
for (int i = 0; i < 4; i++)
{
entityList.Add(generateAsteroid(deadAsteroid.position, deadAsteroid.velocityDirection, deadAsteroid.velocityMagnitude, Asteroid.TINY_ASTEROID_TYPE));
}
}
else
score += 25;
}
