source: 2013/27/TeemuM/Game/Game/Game/Player.cs @ 4467

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

public class Player : PhysicsObject
{
    private static Image playerImage = Game.LoadImage("Player");

    private G game;


    const double defaultSpeed = 1000;
    const int defaultPower = 10000;
    private double speed = defaultSpeed;
    private double power = defaultPower;

    private Weapon weapon;
    public IntMeter health;
    public bool canMove = true;

    //Handlers
    public delegate void EmptyHandler();

    //Events
    public event EmptyHandler Dying;

    public Player(G game, double width, double height, int health, bool addDefaultControls)
        : base(width, height)
    {
        this.game = game;
        this.health = new IntMeter(health, 0, health);
        this.health.LowerLimit += delegate { if (Dying != null) Dying(); this.Destroy(); };
        this.Tag = "player";
        this.Shape = Shape.Rectangle;
        this.Image = playerImage;
        this.LinearDamping = 0.9;

        if (addDefaultControls)
            SetControls(Key.W, Key.S, Key.D, Key.A, MouseButton.Left);

        G.game.AddCollisionHandler(this, PlayerCollisionHanlder);
        this.IsUpdated = true;
    }

    #region Collision handlers

    private void PlayerCollisionHanlder(PhysicsObject player, PhysicsObject target)
    {
        if (target is Enemy)
        {
            health.Value -= 1;
        }
    }

    private void Explosion(Vector pos)
    {
        Explosion explosion = new Explosion(50);
        explosion.Position = pos;
        game.Add(explosion);
    }

    private void ProjectileHanlder(PhysicsObject projectile, PhysicsObject target) //ToDo: Set collisions
    {
        if (target is Enemy)
        {
            Explosion(target.Position);
            if (weapon is Cannon)
                ((Enemy)target).Health(-100);
            else if (weapon is PlasmaCannon)
                ((Enemy)target).Health(-100);
            else if (weapon is LaserGun)
                ((Enemy)target).Health(-50);
            else if (weapon is AssaultRifle)
                ((Enemy)target).Health(-50);
        }
        projectile.Destroy();
    }

    #endregion

    public bool PowerUp(String type, double value)
    {
        if (type == "speed")
        {
            speed = defaultSpeed * value;
            return true;
        }
        else if (type == "power")
        {
            power = defaultPower * value;
            return true;
        }

        return false;
    }

    public bool GiveWeapon(String itemName)
    {
        RemoveWeapon();
        if (itemName.ToLower() == "cannon")
        {
            weapon = new Cannon(75, 25);
        }
        else if (itemName.ToLower() == "plasmacannon")
            weapon = new PlasmaCannon(75, 25);
        else if (itemName.ToLower() == "lasergun")
            weapon = new LaserGun(75, 25);
        else if (itemName.ToLower() == "assaultrifle")
            weapon = new AssaultRifle(75, 25);

        if (weapon != null)
        {
            weapon.Power.Value = power;
            weapon.ProjectileCollision = ProjectileHanlder;
            weapon.Angle = Angle.FromDegrees(90);
            weapon.CanHitOwner = true;
            this.Add(weapon);
            return true;
        }
        return false;
    }

    public bool RemoveWeapon()
    {
        if (weapon != null)
        {
            weapon.Destroy();
            return true;
        }
        return false;
    }

    public void SetControls(Key forward, Key back, Key right, Key left, MouseButton shoot)
    {
        Game.Keyboard.Listen(forward, ButtonState.Down, delegate { MovePlayer(new Vector(0, speed)); }, null);
        Game.Keyboard.Listen(back, ButtonState.Down, delegate { MovePlayer(new Vector(0, -speed)); }, null);
        Game.Keyboard.Listen(right, ButtonState.Down, delegate { MovePlayer(new Vector(speed, 0)); }, null);
        Game.Keyboard.Listen(left, ButtonState.Down, delegate { MovePlayer(new Vector(-speed, 0)); }, null);
        Game.Mouse.Listen(shoot, ButtonState.Down, Shoot, null);
    }

    private void MovePlayer(Vector force)
    {
        if (canMove && !IsDestroyed)
            this.Push(force);
    }

    public void Shoot()
    {
        if (!IsDestroyed)
        {
            if (weapon != null)
            {
                weapon.Power.Value = power;
                weapon.Shoot();
            }
            else
                Game.MessageDisplay.Add("PEW PEW!");
        }
    }

    public override void Update(Time time)
    {
        this.Angle = (Game.Mouse.PositionOnWorld - this.AbsolutePosition).Normalize().Angle - Angle.FromDegrees(90);
        base.Update(time);
    }
}