/// <summary>
/// Unloads the game's particle system and saves the high-score.
/// </summary>
public void UnloadContent()
{
SaveHighscore();
particles = null;
}
/// <summary>
/// Creates a new instance of the game helper.
/// </summary>
/// <param name="contentManager">The content manager to use for loading the games content.</param>
/// <param name="spriteBatch">The sprite batch to use for drawing the game's gameplay screen.</param>
/// <param name="graphicsDevice">The graphics device on which the game is rendered.</param>
public GameplayHelper(ContentManager contentManager, SpriteBatch spriteBatch,
GraphicsDevice graphicsDevice)
{
random = new Random();
worldBounds = new Rectangle(0, 0, (int)screenWidth, (int)screenHeight);
gameOver = true;
player = new Player();
playerBullets = new List<Bullet>();
aliens = new List<Alien>();
alienBullets = new List<Bullet>();
particles = new ParticleSystem(contentManager, spriteBatch);
InitializeAssets(contentManager, spriteBatch, graphicsDevice);
}
/// <summary>
/// Deserializes the game's state from a supplied XML reader.
/// </summary>
/// <param name="reader">The reader from which to deserialize game state data.</param>
public void ReadXml(XmlReader reader)
{
// Read the wrapper element
reader.Read();
// deserialize basic gameplay elements
DeserializeGameplayMembers(reader);
// Deserialize the particle system
XmlSerializer particleSystemSerializer = new XmlSerializer(typeof(ParticleSystem));
particles = particleSystemSerializer.Deserialize(reader) as ParticleSystem;
// Deserialize the player
XmlSerializer playerSerializer = new XmlSerializer(typeof(Player));
player = playerSerializer.Deserialize(reader) as Player;
// Deserialize the various bullets
XmlSerializer bulletSerializer = new XmlSerializer(typeof(Bullet));
int playerBulletCount = int.Parse(reader.GetAttribute("Count"));
// Read past the opening element for the player bullet list
reader.Read();
for (int i = 0; i < playerBulletCount; i++)
{
playerBullets.Add(bulletSerializer.Deserialize(reader) as Bullet);
}
// Advance past the closing element if it exists
if (playerBulletCount > 0)
{
reader.Read();
}
int alienBulletCount = int.Parse(reader.GetAttribute("Count"));
// Read past the opening element for the alien bullet list
reader.Read();
for (int i = 0; i < alienBulletCount; i++)
{
alienBullets.Add(bulletSerializer.Deserialize(reader) as Bullet);
}
// Advance past the closing element if it exists
if (alienBulletCount > 0)
{
reader.Read();
}
// Deserialize the aliens
XmlSerializer alienSerializer = new XmlSerializer(typeof(Alien));
int alienCount = int.Parse(reader.GetAttribute("Count"));
// Read past the opening element for the alien list
reader.Read();
for (int i = 0; i < alienCount; i++)
{
aliens.Add(alienSerializer.Deserialize(reader) as Alien);
}
// Advance past the closing element if it exists
if (alienCount > 0)
{
reader.Read();
}
reader.Read();
}
/// <summary>
/// This constructor should only be used by the XML serializer.
/// </summary>
public GameplayHelper()
{
random = new Random();
worldBounds = new Rectangle(0, 0, (int)screenWidth, (int)screenHeight);
gameOver = true;
player = new Player();
playerBullets = new List<Bullet>();
aliens = new List<Alien>();
alienBullets = new List<Bullet>();
particles = new ParticleSystem();
}