source: 2013/27/TeemuM/Game/Game/Game/Enemies.cs @ 4502

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Jypeli;
using Jypeli.Assets;
using Jypeli.Controls;
using Jypeli.Effects;
using Jypeli.Widgets;

public class Enemy : PhysicsObject
{
    public delegate void EmptyHandler();
    public event EmptyHandler Dying;

    private PhysicsObject follow;
    private int health;

    public Enemy(PhysicsObject follow, int health, double widht, double height) : base(widht, height)
    {
        this.health = health;
        this.follow = follow;
        this.IsUpdated = true;
    }

    public void Health(int healtChange)
    {
        health += healtChange;
        if (health <= 0)
        {
            if (Dying != null)
                Dying();
            this.Destroy();
        }
    }

    public override void Update(Time time)
    {
        this.Angle = (G.game.player.Position - this.AbsolutePosition).Normalize().Angle - Angle.FromDegrees(90);
        base.Update(time);
    }
}

public class Zombie : Enemy
{
    private static Image[] Images = { Game.LoadImage("Slime"), Game.LoadImage("Slime2"), Game.LoadImage("Slime3"), Game.LoadImage("Slime4") };
    PhysicsObject follow;

    public Zombie(PhysicsObject follow, double widht, double height, double x, double y, int health) : base(follow, health, widht, height)
    {
        this.follow = follow;
        this.X = x;
        this.Y = y;
        this.Shape = Shape.Circle;
        RandomTexture(); 
        CreateBrain();
    }

    public void RandomTexture()
    {
        this.Image = Images[RandomGen.NextInt(Images.Length)];
    }

    private void CreateBrain()
    {
        FollowerBrain brain = new FollowerBrain(follow);
        brain.Speed = 100;
        brain.Active = true;
        this.Brain = brain;
    }
}