TetraminoFactory.cs :  » Game » DotNETris » KP » Tetris » C# / CSharp Open Source

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C# / CSharp Open Source » Game » DotNETris 
DotNETris » KP » Tetris » TetraminoFactory.cs
// (c) 2005 kp@kp73.com

using System;

namespace KP.Tetris{
  /// <summary>
  /// Returns a psudeo random tetramino instance.
  /// </summary>
  internal class TetraminoFactory
  {
    /// <summary>
    /// Psudo random number generator.
    /// </summary>
    private Random randomGenerator;

    /// <summary>
    /// Factory singleton instance.
    /// </summary>
    private static TetraminoFactory m_instance;

    /// <summary>
    /// Collection of tetramino instances.
    /// </summary>
    private Tetramino[] pieceStore = new Tetramino[7];

    /// <summary>
    /// Construct an instance of the factory.
    /// </summary>
    private TetraminoFactory() // prevent instance creation outside this class
    {    
      // populate the store
      pieceStore[0] = new Tetraminos.O();
      pieceStore[1] = new Tetraminos.I();
      pieceStore[2] = new Tetraminos.S();
      pieceStore[3] = new Tetraminos.Z();
      pieceStore[4] = new Tetraminos.L();
      pieceStore[5] = new Tetraminos.J();
      pieceStore[6] = new Tetraminos.T();
      pieceStore[0].Initialise();
      pieceStore[1].Initialise();
      pieceStore[2].Initialise();
      pieceStore[3].Initialise();
      pieceStore[4].Initialise();
      pieceStore[5].Initialise();
      pieceStore[6].Initialise();
    }

    /// <summary>
    /// Creates the singleton instance if necessary.
    /// </summary>
    private static void CheckInstance()
    {
      lock (typeof(TetraminoFactory))
      {
        if (m_instance == null) m_instance = new TetraminoFactory();
      }
    }

    /// <summary>
    /// Get the random number generator instance.
    /// </summary>
    internal Random Rand
    {
      get { return randomGenerator; }
    }

    /// <summary>
    /// Provides a staring value for the random number generator instance.
    /// </summary>
    internal static void SeedRandom()
    {
      CheckInstance();
      string tickText = System.Environment.TickCount.ToString();
      int seed = int.Parse(tickText.Substring(tickText.Length - 4));
      m_instance.randomGenerator = new Random(seed);
    }

    /// <summary>
    /// Get a new tetramino instance.
    /// </summary>
    internal static Tetramino NewTetramino
    {
      get
      {
        CheckInstance();
        return (Tetramino)m_instance.GetNew();
      }
    }

    /// <summary>
    /// Selects and returns random tetramino instance from the store.
    /// </summary>
    /// <returns>Random tetramino instance from the store</returns>
    private Tetramino GetNew()
    {
      int pieceNumber = this.Rand.Next(0, 7);
      return pieceStore[pieceNumber];
    }

  } // class TetraminoFactory

} // namespace KP.Tetris

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