level.cs

Pocket 1945 is a classic shooter inspired by the classic 1942 game. The game is written in C# target

using System;
using System.IO;
using System.Xml;
using System.Collections;

namespace Pocket1945
{
	/// <summary>
	/// This class represents a level of the game. All level 
	/// data is loaded from a XML file passed into the constructor. 
	/// 
	/// The GameForm keeps a instance to a static Level class at all time.
	/// That way other game objects like enemies etc. can access the level.
	/// 
	/// Data that's used trough out the game is keept in the GameForm class,
	/// while level data is keept in this class.
	/// </summary>
	public class Level
	{
		public int Height;
		public int Speed;
		public string Name;
		public Bonus[] Bonuses;
		public Enemy[] Enemies;		
		public string[] Map;
		public BackgroundElement[] BackgroundElements;
		public Background BackgroundMap;
		public ArrayList Bullets;

		/// <summary>
		/// Method instanciating a new level based on a XML level file.
		/// </summary>
		/// <param name="filename">The path to the XML level file.</param>
		public Level(string filename)
		{
			//Loading a XmlDocument based on the filepath.
			XmlDocument xml = new XmlDocument();
			xml.Load(filename);		
	
			//Setting the scrollspeed of the level. The speed is set by pixels pr. second.
			Speed = Convert.ToInt32(xml.GetElementsByTagName("Level")[0].Attributes["Speed"].InnerText);
			Name = xml.GetElementsByTagName("Level")[0].Attributes["Name"].InnerText;

			//Loading the map ASCII table.
			char[] seperator = {'\n'};
			string mapString = xml.GetElementsByTagName("Map")[0].InnerText;			
			Map = mapString.Split(seperator);

			//Selecting all background elements.
			XmlNodeList bgElements = xml.GetElementsByTagName("Element");
			BackgroundElements = new BackgroundElement[bgElements.Count];

			//Creating all background elements.
			for(int i = 0; i < bgElements.Count; ++i)
			{
				BackgroundElements[i] = new BackgroundElement(
						Convert.ToInt32(bgElements[i].Attributes["X"].InnerText), 
						Convert.ToInt32(bgElements[i].Attributes["Y"].InnerText), 
						Convert.ToInt32(bgElements[i].Attributes["Height"].InnerText),
						Convert.ToInt32(bgElements[i].Attributes["Width"].InnerText),
						Convert.ToInt32(bgElements[i].Attributes["SpriteIndex"].InnerText));
			}

			//Selecting all bonus elements.
			XmlNodeList bonusElements = xml.GetElementsByTagName("Bonus");
			Bonuses = new Bonus[bonusElements.Count];

			//Creating all bonus elements.
			for(int i = 0; i < bonusElements.Count; ++i)
			{
				Bonuses[i] = new Bonus(
						Convert.ToInt32(bonusElements[i].Attributes["X"].InnerText),
						Convert.ToInt32(bonusElements[i].Attributes["Y"].InnerText),
						Convert.ToInt32(bonusElements[i].Attributes["Speed"].InnerText) / GameForm.FramesPerSecond,
						(BonusType)Convert.ToInt32(bonusElements[i].Attributes["BonusType"].InnerText));
			}
			
			//Selecting all enemies.
			XmlNodeList enemies = xml.GetElementsByTagName("Enemy");
			Enemies = new Enemy[enemies.Count];

			//Creating all enemies.
			for(int i = 0; i < enemies.Count; ++i)
			{
				Enemies[i] = new Enemy(
						Convert.ToInt32(enemies[i].Attributes["X"].InnerText),
						Convert.ToInt32(enemies[i].Attributes["Y"].InnerText),
						Convert.ToInt32(enemies[i].Attributes["Speed"].InnerText) / GameForm.FramesPerSecond,
						(MovePattern)Convert.ToInt32(enemies[i].Attributes["MovePattern"].InnerText),
						(EnemyType)Convert.ToInt32(enemies[i].Attributes["EnemyType"].InnerText),
						(BulletType)Convert.ToInt32(enemies[i].Attributes["BulletType"].InnerText),					
						Convert.ToInt32(enemies[i].Attributes["BulletPower"].InnerText),
						(double)(Convert.ToDouble(enemies[i].Attributes["BulletSpeed"].InnerText) / GameForm.FramesPerSecond),
						(double)(Convert.ToDouble(enemies[i].Attributes["BulletReloadTime"].InnerText) / (double)1000) * GameForm.FramesPerSecond,
						Convert.ToInt32(enemies[i].Attributes["Power"].InnerText),
						Convert.ToInt32(enemies[i].Attributes["Score"].InnerText));				
			}

			//Creating the background map for this level.
			BackgroundMap = new Background(Map, BackgroundElements);
			BackgroundMap.Speed = Speed / GameForm.FramesPerSecond;

			//Creating a arraylist to hold all the bullets on the level.
			Bullets = new ArrayList();				
		}

		/// <summary>
		/// Get's the current progress in %.
		/// </summary>
		/// <returns>% of the game that is finished.</returns>
		public int GetProgress()
		{			
			double percent = (double)BackgroundMap.Y  / (double)BackgroundMap.Height * (double)100;
			return 100 - (int)percent;
		}
	}
}