source: 2013/27/TeemuM/Game/Game/Game/Player.cs @ 4417

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

public class Player : PhysicsObject
{
    const double defaultSpeed = 1000;
    const int defaultPower = 10000;
    private static Image playerImage = Game.LoadImage("Player");

    Weapon weapon;
    double speed = defaultSpeed;
    int power = defaultPower;
    private int _health = 0;
    public int health
    {
        get
        {
            return _health;
        }
        set
        {
            if (value == 0)
                Game.MessageDisplay.Add("GAME OVER!");
            _health = value;
        }
    }

    public Player(double width, double height, int health, bool addDefaultControls) : base(width, height)
    {
        this.Tag = "player";
        this.Shape = Shape.Rectangle;
        this.Image = playerImage;
        this.LinearDamping = 0.9;

        this.health = health;

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

        this.IsUpdated = true;
    }

    public bool PowerUp(String type, int value)
    {
        if (type == "speed")
        {
            speed = defaultSpeed + 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);

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

    private void ProjectileHanlder(PhysicsObject projectile, PhysicsObject target)
    {
        if (target is Zombie1)
        {
            if (weapon is Cannon)
            {
                ((Zombie1)target).Healt(-100);
            }
            else if (weapon is PlasmaCannon)
            {
                ((Zombie1)target).Healt(-50);
            }
        }
        projectile.Destroy();
    }

    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.Pressed, Shoot, null);
    }

    private void MovePlayer(Vector force)
    {
        this.Push(force);
    }

    public void Shoot()
    {
        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);
    }
}