Pocket 1945 - A C# .NET CF Shooter

using System;
using System.Drawing;
using System.Drawing.Imaging;

namespace Pocket1945
{
	/// <summary>
	/// This class defines a game bonus element. A bonus can be 
	/// a extra life, a power up, more speed etc. The type of bonus is defined
	/// by the BonusType enum. The player object have a method, GetBonus(Bonus b), 
	/// that process a bonus element.
	/// </summary>
	public class Bonus : Sprite
	{		
		private int spriteIndex;
		private int startPosition;	
		private double tempY;
		private double speed;
		
		public bool Collected;
		public BonusType Type;

		/// <summary>
		/// Instanciates a new bonus object.
		/// </summary>
		/// <param name="x">The x position of the bonus element.</param>
		/// <param name="startPosition">The y start position of the bonus element.</param>
		/// <param name="speed">The speed of the bonus element.</param>
		/// <param name="bonusType">The type of bonus.</param>
		public Bonus(int x, int startPosition, double speed, BonusType bonusType)
		{
			this.x = x;
			this.y = -32;
			this.tempY = this.y;
			this.speed = speed;
			this.startPosition = startPosition;
			this.Type = bonusType;
			this.spriteSize.Height = 32;
			this.spriteSize.Width = 32;		
			SetBonusSpesific();
		}

		/// <summary>
		/// Method setting bonus spesific properties like sprite index and sprite size.
		/// </summary>
		private void SetBonusSpesific()
		{
			switch(Type)
			{
				case BonusType.ExtraLife : 
					spriteIndex = 1;
					collitionRectangle.Width = 23;
					collitionRectangle.Height = 18;
					collitionPoint.X = 4;
					collitionPoint.Y = 6;
					break;
				case BonusType.SmallPowerUpgrade : 
					spriteIndex = 4;
					collitionRectangle.Width = 24;
					collitionRectangle.Height = 25;
					collitionPoint.X = 4;
					collitionPoint.Y = 5;
					break;
				case BonusType.PowerUpgrade :
					spriteIndex = 5;
					collitionRectangle.Width = 24;
					collitionRectangle.Height = 25;
					collitionPoint.X = 4;
					collitionPoint.Y = 5;
					break;
				case BonusType.RankUpgrade : 
					spriteIndex = 2;
					collitionRectangle.Width = 29;
					collitionRectangle.Height = 15;
					collitionPoint.X = 1;
					collitionPoint.Y = 7;					
					break;
				case BonusType.SpeedUpgrade :
					spriteIndex = 3;
					collitionRectangle.Width = 20;
					collitionRectangle.Height = 28;
					collitionPoint.X = 7;
					collitionPoint.Y = 2;
					break;
				case BonusType.ShieldUpgrade : 
					spriteIndex = 6;
					collitionRectangle.Width = 20;
					collitionRectangle.Height = 29;
					collitionPoint.X = 7;
					collitionPoint.Y = 1;
					break;
				case BonusType.WheaponUpgrade : 
				default : 
					spriteIndex = 0;
					collitionRectangle.Width = 20;
					collitionRectangle.Height = 27;
					collitionPoint.X = 7;
					collitionPoint.Y = 3;
					break;
			}			
		}

		/// <summary>
		/// Method returning the sprite index of the bonus.
		/// </summary>
		/// <returns>Returns the sprite index of the bonus sprite.</returns>
		public override int GetSpriteIndex()
		{
			return spriteIndex;
		}

		/// <summary>
		/// Method determing weather the bonus element has focus or not.
		/// </summary>
		/// <returns>True if the bonus is on screen and has focus.</returns>
		public bool HasFocus()
		{
			return(!Collected && startPosition >= GameForm.CurrentLevel.BackgroundMap.Y && GameForm.GameArea.Height > y);			
		}

		/// <summary>
		/// Method moving the bonus element.
		/// </summary>
		public void Move()
		{			
			tempY += speed;
			y = (int)tempY;
		}

		public override void Draw(Graphics g)
		{
			int index = GetSpriteIndex();			
			g.DrawImage(SpriteList.Instance.Bonuses[index], new Rectangle(x, y, spriteSize.Width, spriteSize.Height), 0, 0, spriteSize.Width, spriteSize.Height, GraphicsUnit.Pixel, imgAttribs);
		}
	}
}