Dogcows Code - chaz/carfire/blob - CarFire/CarFire/CarFire/Trigger.cs

   1 using System;
   2 using System.Collections.Generic;
   3 using System.Linq;
   4 using System.Text;
   5 using Microsoft.Xna.Framework;
   6 using Microsoft.Xna.Framework.Graphics;
   7 using Microsoft.Xna.Framework.Content;
   8
   9 namespace CarFire
  10 {
  11     /// <summary>
  12     /// A trigger is an invisible entity whose only purpose is
  13     /// to check a condition and run a script when the condition
  14     /// is right.
  15     /// </summary>
  16     public class Trigger : IEntity
  17     {
  18         #region Public Methods
  19
  20         public Trigger(char identifier, Point position, Dictionary<string, string> info, Game game)
  21         {
  22             mGame = game;
  23             mPrevCondition = false;
  24             mCoordinates = position;
  25
  26             string condition;
  27             if (info.TryGetValue("condition", out condition))
  28             {
  29                 mCondition = new Script(condition, game);
  30             }
  31             else throw new Exception("Triggers must define a condition script.");
  32
  33             string eventt;
  34             if (info.TryGetValue("event", out eventt))
  35             {
  36                 mEvent = new Script(eventt, game);
  37             }
  38             else throw new Exception("Triggers must define an event script.");
  39         }
  40
  41         public void Update(TimeSpan timeSpan)
  42         {
  43             Player player = mGame.GetPlayerAtCoordinates(mCoordinates);
  44             if (player != null)
  45             {
  46                 bool condition = mCondition.Run(player);
  47                 if (condition && condition != mPrevCondition)
  48                 {
  49                     mEvent.Run(player);
  50                 }
  51                 mPrevCondition = condition;
  52             }
  53             else
  54             {
  55                 mPrevCondition = false;
  56             }
  57         }
  58
  59         public void LoadContent(ContentManager contentManager)
  60         {
  61             // No implementation needed.
  62         }
  63
  64         public void Draw(SpriteBatch spriteBatch)
  65         {
  66             // No implementation needed.
  67         }
  68
  69         public Vector2 Position
  70         {
  71             get { return Vector2.Zero; }
  72         }
  73
  74         public Point Coordinates
  75         {
  76             get { return new Point(-1, -1); }
  77         }
  78
  79         #endregion
  80
  81
  82         #region Private Variables
  83
  84         Script mCondition;
  85         Script mEvent;
  86         Game mGame;
  87         bool mPrevCondition;
  88         Point mCoordinates;
  89
  90         #endregion
  91     }
  92 }