source: 2015/26/ohjaajat/HillbillyRun/HillbillyRun/HillbillyRun/HillbillyRun/HillbillyRun.cs @ 6301

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

/* Muistutuksia.
 * 
 * Layerit
 *   3 - 
 *   2 - 
 *   1 - 
 *   0 -
 *  -1 - Näkyvä maanpinta.
 *  -2 - Talot taustalla.
 *  
 * CollisionIgnoreGroupit
 *  3 - Ryömivät ja liekit. //TODO: lisätä noidatkin tänne
 *  2 - Kärry.
 * 
*/

#region Improvement
public abstract class Improvement : PlatformCharacter
{
    public List<Animation> Animations { get; set; }

    protected Improvement(double width, double height)
        : base(width, height)
    {

    }

    public HillBilly Owner
    {
        get { return owner; }
        set { owner = value; }
    }
    private HillBilly owner;

    public virtual void DoTheThing() { }
}

//Luokka maajussien erikoisuuksille.
public class MilkImprovement : Improvement
{


    public override void DoTheThing()
    {
        HillbillyRun game = this.Game as HillbillyRun;
        Owner.PlayAnimation(Animations[1]);
        game.CreateMilkParticles(this.Owner, 10, 200, 300, new Vector(0, -30), "milkparticle");

    }

    public MilkImprovement(double width, double height)
        : base(width, height)
    {

    }
}

#endregion

public class HillBilly : PlatformCharacter
{
    private IntMeter lifeCounter = new IntMeter(4, 0, 4);
    public IntMeter Life
    {
        set { lifeCounter = value; }
        get { return lifeCounter; }
    }

    public Improvement Improvement { get; set; }

    public Label Name { get; set; }

    private ProgressBar visibleLife;
    public ProgressBar VisibleLife
    {
        get { return visibleLife; }
        set { visibleLife = value; }
    }

    public void GainImprovement(Improvement improvement)
    {
        this.AnimWalk = improvement.Animations[0];
        this.AnimIdle = new Animation(improvement.Animations[0].CurrentFrame);
        this.Improvement = improvement;
        improvement.Owner = this;

        improvement.Destroy();
    }

    public void UseImprovement(Improvement improvement)
    {
        if (Animation != improvement.Animations[1])
        {
            improvement.DoTheThing();
        }
    }

    public HillBilly(double leveys, double korkeus, String name)
        : base(leveys, korkeus)
    {

        this.visibleLife = new ProgressBar(50, 15); //(this.Width, this.Height/8);
        this.Add(visibleLife);
        this.visibleLife.Position += new Vector(0, this.Height / 2 + this.Height / 5);
        this.visibleLife.BindTo(this.lifeCounter);
        this.visibleLife.Color = Color.Black;

        this.Name = new Label(name);
        this.Add(Name);
        this.Name.Position += new Vector(0, this.Height / 2 + this.Height / 3);
    }
}

/// <summary>
/// An MMO where you go to war with mages in the lava kingdom.
/// </summary>
public class HillbillyRun : PhysicsGame
{
    private List<HillBilly> players = new List<HillBilly>();
    private List<HillBilly> startingPlayers = new List<HillBilly>();

    //private List<double> playerPositionsX = new List<double>();
    //private List<double> playerPositionsY = new List<double>();

    private const double PLAYER_SPEED = 180;
    public const double TILE_SIZE = 70;

    public String[] names = new String[] { "Adolfiina", "Rasputiina", "Hermanniina", "Joosefiina"};
        
    private double cameraTargetX; // Sijainti jossa kameran pitäisi olla.
    private Vector cameraTarget;

    private double cameraOffset; //= 400; // TODO: Tämän voisi ehkä laskea jostain (esim. ikkunan leveydestä kolmasosa tai jotain).
    private double cameraSpeed = 2.0; // Kameran liikkumisnopeus.

    # region Images
    private Image[] groundImages = LoadImages("ground", "ground_forest");    //Näitä ei tosin kaikkia kenties jaksa tehdä erilaisiksi levelistä riippuen
    private Image[] groundTopImages = LoadImages("ground_top", "ground_top_forest");
    private Image[] foregroundDecorations = LoadImages("viljaa", "grass");
    private Image[] blockImages = LoadImages("box2", "rock");

    private Image[] houseImages = LoadImages("house", "houseburned");

    private Image cartImage = LoadImage("cart");
    private Image milkImage = LoadImage("tonkkaitem");

    private Image cartWheelImage = LoadImage("cartwheel");

    private Image smokeImage1 = LoadImage("smoke1");
    private Image smokeImage2 = LoadImage("smoke2");

    private Image treeTrunkImage = LoadImage("bigtree");
    private Image treeBottomImage = LoadImage("bigtree3x2");
    private Image treeBranchImage = LoadImage("bigtreebranch");
    private Image forestBackgroundImage = LoadImage("forestbackground");

    private Animation crawl;
    private Animation blaze;

    private Animation pitchforkAttack;
    private Animation pitchforkWalk;
    private Animation milkThrow;
    private Animation milkWalk;
    private Animation normalWalk;
    private Animation playerIdle;
    private Animation playerJump;
    private Animation playerFall;
    private Animation firemageAnimation;
    private Animation firemageCastAnimation;
    private Animation wormAnimation;
    #endregion

    private double leftCamLimit;
    private double rightCamLimit;
    private double bottomCamLimit;

    private int levelNumber = 0;

    public override void Begin()
    {
        Initializing();
        //IntroSequence();
        //MainMenu();
        StartGame();
    }

    #region Intro
    void IntroSequence()
    {
        Level.Background.Color = Color.Black;

        Keyboard.Listen(Key.Escape, ButtonState.Pressed, SkipIntro, "Skip");

        ShowMadeWithJypeli();

        Timer.SingleShot(4.0, delegate // TODO get rid of fixed amount of seconds
        {
            ShowBackgroundStory();
        });



    }

    void ShowMadeWithJypeli()
    {
        Image madewithImage = LoadImage("madewithjypeli");

        double w = Window.Width / 4;
        double h = w * (madewithImage.Height / (double)madewithImage.Width); // take aspect ratio from the picture

        GameObject madewithjypeliObject = new GameObject(w, h);
        madewithjypeliObject.Image = madewithImage;
        Add(madewithjypeliObject);

        // Tässä oli jotain epätehokasta feidailua tuolle Made with Jypeli -kuvalle. Ei tunnu päivittyvän joka framella tai on muuten vain tosi raskas...

        //fadeTimer = new Timer();
        //fadeTimer.Interval = 0.5;
        //fadeTimer.Timeout += delegate
        //{
        //    madewithjypeliObject.Image = LerpImage(madewithjypeliObject.Image, Color.Black, 0.6);
        //};
        //fadeTimer.Start(5);

        Timer.SingleShot(1.2, delegate
        {
            madewithjypeliObject.Destroy();
        });

    }

    Image LerpImage(Image original, Color targetColor, double ratio)
    {
        Image newImage = new Image(original.Width, original.Height, Color.Transparent);
        for (int y = 0; y < original.Height; y++)
        {
            for (int x = 0; x < original.Width; x++)
            {
                newImage[y, x] = Color.Lerp(original[y, x], targetColor, ratio);
            }
        }
        return newImage;
    }

    void ShowBackgroundStory()
    {
        ShowStoryText(new Queue<string>(new[] { "Once upon a time...", "...blaa blaa blaa.", "Blaa." }));
    }

    void ShowStoryText(Queue<string> messages)
    {
        // Mennään alkuvalikkoon jos ei ole enää viestejä.
        if (messages.Count == 0)
        {
            MainMenu();
            return;
        }

        // Näytetään nykyinen viesti.
        var storyLabel = new Label(messages.Dequeue()) { TextColor = Color.Black, TextScale = new Vector(3, 3) };
        Add(storyLabel);

        var textTimer = new Timer { Interval = 0.05 };
        textTimer.Timeout += () => storyLabel.TextColor = Color.Lerp(storyLabel.TextColor, Color.White, 0.05);
        textTimer.Start();

        // Näytetään seuraava viesti muutaman sekunnin päästä.
        Timer.SingleShot(4, delegate { storyLabel.Destroy(); ShowStoryText(messages); });
    }

    void SkipIntro()
    {
        ClearTimers();
        ClearAll();
        Keyboard.Clear();
        MainMenu();
    }

    void MainMenu()
    {
        Level.Background.Color = Color.DarkBlue;

        MultiSelectWindow mainmenu = new MultiSelectWindow("Main menu",
"Start game", "Credits", "Exit");
        mainmenu.AddItemHandler(0, StartGame);
        mainmenu.AddItemHandler(1, ShowCredits);
        mainmenu.AddItemHandler(2, Exit);
        mainmenu.DefaultCancel = 2;
        Add(mainmenu);
    }

    void ShowCredits()
    {
        MessageWindow win = new MessageWindow("This game was made in one week by\nSimo Rinne,\nEmma Heikura,\n and Jouni Potila\n using University of Jyväskylä's\n game programming library Jypeli");
        win.Closed += delegate
        {
            ClearAll();
            MainMenu();
        };
        Add(win);
    }
    #endregion

    void StartGame()
    {
        ClearAll();
        CreateLevel();
        ScreenSettings();
        SetControls();
    }

    public void NextLevel()
    {
        levelNumber++;
        StartGame();
    }

    void Initializing()
    {
        crawl = LoadAnimation("crawl");
        blaze = LoadAnimation("flame");
        pitchforkAttack = LoadAnimation("attack");
        pitchforkWalk = LoadAnimation("hanko");
        milkThrow = LoadAnimation("heitto");
        milkWalk = LoadAnimation("tonkka");
        normalWalk = LoadAnimation("pwalk");
        playerIdle = LoadAnimation("idle");
        playerJump = LoadAnimation("jump");
        playerFall = LoadAnimation("fall");
        firemageAnimation = LoadAnimation("firemage");
        firemageCastAnimation = LoadAnimation("firemagecast");
        wormAnimation = LoadAnimation("worm");

        cameraOffset = Window.Width / 4;
    }

    void ScreenSettings()
    {
        Window.Width = 1800;
        Window.Height = 900;

        leftCamLimit = Level.Left + Window.Width / 2.0;
        rightCamLimit = Level.Right - Window.Width / 2.0;
        bottomCamLimit = Level.Bottom + Window.Height / 2.0;

        Camera.X = cameraTargetX = leftCamLimit;

        Timer cameraTimer = new Timer();
        cameraTimer.Interval = 1 / 30.0;
        cameraTimer.Timeout += UpdateCamera;
        cameraTimer.Start();

        //Background
        GameObject forestBackground = new GameObject(Level.Width, Level.Height);
        forestBackground.Image = forestBackgroundImage;
        forestBackground.TextureWrapSize = new Vector(5, 1);
        Add(forestBackground, -3);
        Layers[-3].RelativeTransition = new Vector(0.5, 1.0);

        if (levelNumber == 1)
        {
            Level.Background.CreateGradient(Color.Black, Color.FromHexCode("495147"));
        }
        else
        {
            Level.Background.CreateGradient(Color.Black, Color.SkyBlue);
        }
    }

    #region LevelCreation
    void CreateLevel()
    {
        startingPlayers.Clear();
        players.Clear();
        Gravity = new Vector(0, -1000);

        //Tilemap
        ColorTileMap level = ColorTileMap.FromLevelAsset("level" + levelNumber);
        level.SetTileMethod(Color.Black, CreateGroundTop);
        level.SetTileMethod(Color.Brown, CreateGround);

        level.SetTileMethod(Color.Cyan, CreateHouse);
        level.SetTileMethod(Color.PaintDotNetBlue, CreateBurnedHouse);

        level.SetTileMethod(Color.Gold, CreatePlayer);
        level.SetTileMethod(Color.Harlequin, CreateCart);
        level.SetTileMethod(Color.White, CreateBlockObject);
        level.SetTileMethod(Color.DarkGray, CreateMilk);
        level.SetTileMethod(Color.Gray, (new AbstractTileMap<Color>.TileMethod[] { CreateCrawly, CreateWorm })[levelNumber]); // ಠ_ಠ
        level.SetTileMethod(Color.Red, CreateFireMage);
        level.SetTileMethod(Color.Rose, CreateFlame, true);
        //level.SetTileMethod(Color.Azure, CreateDummy, Color.Azure);   //TODO: CreateSmoke
        //level.SetTileMethod(Color.Orange, CreateDummy, Color.Orange); //TODO: CreateTombstone

        level.SetTileMethod(Color.FromHexCode("FF6A00"), CreateTreeTrunk);
        level.SetTileMethod(Color.FromHexCode("57007F"), CreateTreeRoot);
        level.SetTileMethod(Color.FromHexCode("00FF21"), CreateTreeBranch);

        level.Optimize(Color.Brown);    //Color.Black   //Tekee jännittäviä asioita wheatille, jos optimoidaan (tietysti). Jotenn. 

        level.Execute(TILE_SIZE, TILE_SIZE);
    }

    void CreateTreeBranch(Vector position, double width, double height)
    {
        PhysicsObject branch = PhysicsObject.CreateStaticObject(width, height);
        branch.Position = position;
        branch.Image = treeBranchImage;
        Add(branch, -1);
    }

    void CreateTreeTrunk(Vector position, double width, double height)
    {
        GameObject trunk = new GameObject(width * 3, height);
        trunk.Position = position;
        trunk.Image = treeTrunkImage;
        Add(trunk, -1);
    }

    void CreateTreeRoot(Vector position, double width, double height)
    {
        GameObject roots = new GameObject(width * 9, height * 4);
        roots.Position = position;
        roots.Y -= height;
        roots.Image = treeBottomImage;
        Add(roots, -1);
    }
    
    void CreateFlame(Vector position, double width, double height, bool suuri)
    {
        PhysicsObject flame = new PhysicsObject(width, height * 2);
        //flame.Image = flameImage;
        flame.Color = Color.Red;
        double hieman = height * 0.3;
        flame.Position = position - new Vector(0, hieman);
        flame.CollisionIgnoreGroup = 3;
        flame.Tag = "burn";
        flame.Animation = new Animation(blaze) { FPS = RandomGen.NextInt(20, 26) };
        flame.Animation.Step(RandomGen.NextInt(0, 12));
        flame.Animation.Resume();
        flame.CanRotate = false;
        Add(flame, 1);

        Smoke savu = new Smoke();
        if (suuri)
        {
            flame.IgnoresCollisionResponse = true;

            savu.ParticleImage = smokeImage1;
            savu.OuterParticleImage = smokeImage2;
            savu.MaxLifetime = 1.0;
            savu.MaxScale = 200;
            savu.MinScale = 10;
            savu.Position = flame.Position;
            Wind = new Vector(-10, 0);
            Add(savu);
            flame.MakeStatic();
        }

        AddCollisionHandler(flame, "milkparticle", delegate(PhysicsObject c, PhysicsObject particle)
        {
            particle.Destroy();
            flame.Destroy();
            savu.Destroy();

        });
    }

    void CreateBlockObject(Vector position, double width, double height)
    {
        // Säädin vähän tätä jotta laatikko näkyy hyvin. Pitää ehkä tehdä laatikolle ihan oma metodi.
        PhysicsObject block = PhysicsObject.CreateStaticObject(width, height);
        block.IsVisible = false;
        //block.Image = blockImages[levelNumber];
        block.Position = position;
        block.Y -= height / 2.0;
        Add(block, 1);

        GameObject visibleBlock = new GameObject(width, height * 1.5);
        visibleBlock.Position = position;
        visibleBlock.Image = blockImages[levelNumber];
        visibleBlock.Y -= height / 2.0;
        Add(visibleBlock, -1);
    }

    void CreateMilk(Vector position, double width, double height)
    {
        double size = 30;
        double ratio = milkImage.Height / milkImage.Width;

        Improvement milk = new MilkImprovement(size, size * ratio);
        milk.Image = milkImage;
        milk.Animations = new List<Animation> { milkWalk, milkThrow };
        milk.Position = position;
        milk.Tag = "milk";
        Add(milk);

        //PhysicsObject milk = new PhysicsObject(size, size * ratio);
        //milk.Image = milkImage;
        //milk.Position = position;
        //milk.Tag = "milk";
        //Add(milk);
    }

    void CreateWorm(Vector position, double width, double height)
    {
        PlatformCharacter worm = new PlatformCharacter(width, height * 0.6);
        worm.Position = position;
        worm.Animation = new Animation(wormAnimation);
        worm.Animation.FPS = RandomGen.NextInt(18, 24);
        worm.Animation.Step(RandomGen.NextInt(0, 16));
        worm.Animation.Resume();
        worm.Tag = "worm";
        worm.CollisionIgnoreGroup = 3;
        Add(worm, 1);

        PlatformWandererBrain brain = new PlatformWandererBrain();
        brain.Speed = 60;
        brain.FallsOffPlatforms = false;
        worm.Brain = brain;
    }

    void CreateCrawly(Vector position, double width, double height)
    {
        PlatformCharacter crawly = new PlatformCharacter(width * 2, height * 0.6);
        crawly.Position = position;
        crawly.Color = Color.Gray;
        crawly.Animation = new Animation(crawl);
        crawly.Animation.FPS = RandomGen.NextInt(18, 24);
        crawly.Animation.Step(RandomGen.NextInt(0, 16));
        crawly.Animation.Resume();
        crawly.Tag = "burn";
        crawly.CollisionIgnoreGroup = 3;
        Add(crawly, 1);

        GameObject flame = new GameObject(width * 1.4, height * 2);
        flame.Animation = new Animation(blaze) { FPS = RandomGen.NextInt(20, 26) };
        flame.Animation.Step(RandomGen.NextInt(0, 12));
        flame.Animation.Resume();
        Add(flame);

        // Pakko liikutella näin koska lapsioliona liekki näkyisi ryömijän päällä.
        Timer flameMover = new Timer { Interval = 0.05 };
        flameMover.Timeout += delegate
        {
            double hieman = height * 0.75;
            flame.Position = crawly.Position + new Vector(0, hieman);
        };
        flameMover.Start();

        PlatformWandererBrain brain = new PlatformWandererBrain();
        brain.Speed = 20;
        brain.FallsOffPlatforms = true;

        crawly.Brain = brain;

        // Sammuu törmätessään maitoon.
        AddCollisionHandler(crawly, "milkparticle", delegate(PhysicsObject c, PhysicsObject particle)
        {
            particle.Destroy();
            crawly.Brain = null;
            crawly.Animation = new Animation(crawly.Animation.CurrentFrame);
            crawly.Tag = "";
            flame.Destroy();
            RemoveCollisionHandlers(crawly);
        });
    }

    void CreateFireMage(Vector position, double width, double height)
    {
        PlatformCharacter mage = new PlatformCharacter(width * 3, height * 4);
        mage.Position = position;
        mage.Y += mage.Height / 2.0;
        mage.Tag = "burn";
        mage.Tag += "fireMage";
        mage.AnimWalk = new Animation(firemageAnimation);
        mage.CollisionIgnoreGroup = 3;
        Add(mage, 1);
        bool immune = false;

        // Pään päällä oleva liekki (taitaa olla vähän huonossa kohtaa tällä hetkellä)
        PhysicsObject flame = new PhysicsObject(width * 1.4, height * 2);
        flame.Y += mage.Height * 0.65;
        //flame.Y = mage.Y +  mage.Height;
        flame.Animation = new Animation(blaze);
        flame.IgnoresPhysicsLogics = true;
        flame.Animation.Start();
        mage.Add(flame);

        PlatformWandererBrain brain = new PlatformWandererBrain();
        brain.Speed = 20;
        brain.FallsOffPlatforms = false;
        mage.Brain = brain;

        PhysicsObject trigger = PhysicsObject.CreateStaticObject(10, Level.Height); //A truly cool and efficient way to make the boogeyman react only to our closeness
        trigger.Position = mage.Position - new Vector(Window.Width / 2, 0);
        //trigger.Color = Color.Red;
        trigger.IsVisible = false;
        trigger.IgnoresCollisionResponse = true;
        Add(trigger);

        // Taiotaan tulta välillä.
        var castTimer = new Timer { Interval = 10.0 };
        castTimer.Timeout += delegate
        {
            // TODO: Kävelyanimaatio pysähtyy jostain syystä tämän animaation jälkeen.
            mage.PlayAnimation(firemageCastAnimation);

            Timer.SingleShot(1.5,
                delegate
                {
                    for (int i = 0; i < 6; i++)
                    {
                        CreateFlame(new Vector(mage.X + RandomGen.NextDouble(-300, 300), mage.Y + mage.Height * 1.5), 30, 60, false);

                        //PhysicsObject fire = new PhysicsObject(30, 60);
                        //fire.CanRotate = false;
                        //fire.Tag = "burn";
                        //fire.Animation = new Animation(blaze) { FPS = RandomGen.NextInt(20, 26) };
                        //fire.Animation.Step(RandomGen.NextInt(0, 12));
                        //fire.Animation.Resume();
                        //fire.X = mage.X + RandomGen.NextDouble(-300, 300);
                        //fire.Y = mage.Y + mage.Height * 1.5;
                        //fire.CollisionIgnoreGroup = 3;
                        //Add(fire);

                        //AddCollisionHandler(fire, "milkparticle", delegate(PhysicsObject c, PhysicsObject particle)
                        //{
                        //    particle.Destroy();
                        //    fire.Destroy();
                        //});
                    }
                });

        };
        //castTimer.Start();

        AddCollisionHandler(mage, "milkparticle", delegate(PhysicsObject fireMage, PhysicsObject milk)
        {
            if (milk.Y > fireMage.Y + fireMage.Height * 0.15 && !immune)
            {
                flame.Size *= 0.95;
                immune = true;
                if (flame.Height < height)
                {
                    mage.Destroy();
                    castTimer.Stop();
                    NextLevel(); 
                }
                Timer.SingleShot(0.5, delegate { immune = false; });

            }
        });

        AddCollisionHandler(trigger, "player", delegate(PhysicsObject a, PhysicsObject b) { castTimer.Start(); });
    }

    void CreateHouse(Vector position, double width, double height)
    {
        // Näkyvä talo
        GameObject house = new GameObject(width * 10, height * 8);
        house.Image = houseImages[0];
        house.Position = position - new Vector(0, height * 2.5);
        Add(house, -2);

        //Seisottava tasanne
        PhysicsObject platform = PhysicsObject.CreateStaticObject(house.Width - (TILE_SIZE * 3.25), 1);     //Tätä kohtaa on nyt vähän hakemalla haettu.
        platform.IsVisible = false;
        platform.Position = new Vector(house.X + (TILE_SIZE * 0.5), house.Top);
        Add(platform);
    }

    void CreateBurnedHouse(Vector position, double width, double height)
    {
        GameObject house = new GameObject(width * 10, height * 8);
        house.Image = houseImages[1];
        house.Position = position - new Vector(0, height * 2.5);
        Add(house, -2);

        PhysicsObject platform = PhysicsObject.CreateStaticObject(house.Width * 0.25, 1);
        platform.IsVisible = false;
        platform.Position = new Vector(house.X + platform.Width * 0.5, house.Top);
        Add(platform);
    }

    private void CreateCart(Vector position, double width, double height)
    {
        double size = 0.7;
        PhysicsObject cart = new PhysicsObject(400 * size, 80 * size);
        cart.Position = position;
        cart.Image = cartImage;
        cart.CollisionIgnoreGroup = 2;
        Add(cart);
        PhysicsObject cartWheel = new PhysicsObject(160 * size, 160 * size, Shape.Circle);
        cartWheel.Image = cartWheelImage;
        cartWheel.Position = cart.Position + new Vector(-110, -30) * size;
        cartWheel.CollisionIgnoreGroup = 2;
        Add(cartWheel);
        AxleJoint joint = new AxleJoint(cart, cartWheel);
        Add(joint);
    }

    private void CreateDummy(Vector position, double width, double height, Color color)
    {
        PhysicsObject dummy = PhysicsObject.CreateStaticObject(width, height);
        dummy.Position = position;
        dummy.Color = color;
        Add(dummy);
    }

    void CreatePlayer(Vector position, double width, double height)
    {
        HillBilly player = new HillBilly(width, height * 2, names[players.Count()]);
        player.Shape = Shape.Rectangle;
        player.Position = position + new Vector(0, height * 0.5);
        player.Color = Color.White;
        player.AnimWalk = new Animation(normalWalk);
        player.AnimIdle = new Animation(playerIdle);
        player.AnimJump = new Animation(playerJump);
        player.AnimFall = new Animation(playerFall);
        player.AnimFall.StopOnLastFrame = true;
        players.Add(player);
        startingPlayers.Add(player);
        player.Tag = "player";
        Add(player);

        AddCollisionHandler(player, "burn", delegate(PhysicsObject p, PhysicsObject t)
        {
            player.Life.Value--;
        });

        AddCollisionHandler(player, "worm", delegate(PhysicsObject p, PhysicsObject worm)
        {
            if (player.Y > worm.Y && Math.Abs(player.X - worm.X) < worm.Width / 2.0)
            {
                worm.Destroy();
            }
            else
            {
                player.Life.Value--;
            }
        });


        player.Life.LowerLimit += delegate
        {
            if (players.Count < 2)
            {
                Loss();
            }
            else
            {
                players.Remove(player);

                if (player.Improvement != null)
                {
                    Improvement parannus = new MilkImprovement(player.Improvement.Width, player.Improvement.Height);
                    parannus.Image = player.Improvement.Image;
                    parannus.Position = player.Position;
                    parannus.Animations = player.Improvement.Animations;
                    parannus.Tag = player.Improvement.Tag;
                    parannus.Size = new Vector(60, 60);
                    Add(parannus);
                }

                player.Destroy();


            }
        };

        AddCollisionHandler(player, "milk", CollectMilk);
    }

    void CreateGroundTop(Vector position, double width, double height)
    {
        // Puolet pienempi näkymätön palikka alla johon törmää.
        PhysicsObject ground = PhysicsObject.CreateStaticObject(width, height / 2.0);
        ground.IsVisible = false;
        ground.Position = position - new Vector(0.0, TILE_SIZE / 4.0);
        Add(ground);

        // Maanpinnan näkyvä osa.
        GameObject visibleGround = new GameObject(width, height);
        visibleGround.Image = groundTopImages[levelNumber];
        visibleGround.Position = position;
        visibleGround.TextureWrapSize = new Vector(width / TILE_SIZE, height / TILE_SIZE);
        Add(visibleGround, -1);

        int probability = RandomGen.NextInt(100);
        bool wheat = probability < 20;

        if (wheat)
        {
            GameObject wheatBlock = new GameObject(width * 1.5, height * 2);
            wheatBlock.Image = foregroundDecorations[levelNumber];
            wheatBlock.X = visibleGround.X;
            wheatBlock.Bottom = visibleGround.Bottom;
            wheatBlock.TextureWrapSize = new Vector(width / TILE_SIZE, height / TILE_SIZE);
            Add(wheatBlock, 2);
        }
    }

    void CreateGround(Vector position, double width, double height)
    {
        PhysicsObject ground = PhysicsObject.CreateStaticObject(width, height);
        ground.Image = groundImages[levelNumber];
        ground.Position = position;
        ground.TextureWrapSize = new Vector(width / TILE_SIZE, height / TILE_SIZE);
        Add(ground, -1);
    }
    #endregion

    void SetControls()
    {
        Keyboard.Listen(Key.A, ButtonState.Down, delegate { startingPlayers[0].Walk(-PLAYER_SPEED); }, "Player 1 moves left");
        Keyboard.Listen(Key.D, ButtonState.Down, delegate { startingPlayers[0].Walk(PLAYER_SPEED); }, "Player 1 moves right");
        Keyboard.Listen(Key.W, ButtonState.Down, delegate { startingPlayers[0].Jump(PLAYER_SPEED * 2); }, "Player 1 jumps");    //Just PLAYER_SPEED felt alright as well
        Keyboard.Listen(Key.E, ButtonState.Pressed, UseImprovement, "Player 1 uses their tools", startingPlayers[0]);

        Keyboard.Listen(Key.Left, ButtonState.Down, delegate { startingPlayers[1].Walk(-PLAYER_SPEED); }, "Player 2 moves left");
        Keyboard.Listen(Key.Right, ButtonState.Down, delegate { startingPlayers[1].Walk(PLAYER_SPEED); }, "Player 2 moves right");
        Keyboard.Listen(Key.Up, ButtonState.Down, delegate { startingPlayers[1].Jump(PLAYER_SPEED * 2); }, "Player 2 jumps");
        Keyboard.Listen(Key.RightShift, ButtonState.Pressed, UseImprovement, "Player 2 uses their tools", startingPlayers[1]);

        Keyboard.Listen(Key.F12, ButtonState.Pressed, NextLevel, null);
        Keyboard.Listen(Key.R, ButtonState.Pressed, StartGame, null);

        Keyboard.Listen(Key.F1, ButtonState.Pressed, ShowControlHelp, "Show help");
        Keyboard.Listen(Key.Escape, ButtonState.Pressed, ConfirmExit, "Exit game");
    }

    public void CreateMilkParticles(HillBilly billy, int size, int xBase, int yBase, Vector position, String tag)
    {
        for (int i = 0; i < 10; i++)
        {
            const double maxLife = 1.0;
            PhysicsObject milkParticle = new PhysicsObject(size, size, Shape.Circle);
            milkParticle.Color = new Color(255, 255, 255, 128);
            milkParticle.Position = billy.Position + position;
            milkParticle.IgnoresCollisionResponse = true;
            milkParticle.Tag = tag;
            milkParticle.LifetimeLeft = TimeSpan.FromSeconds(maxLife);
            Add(milkParticle);

            // Väri muuttuu läpinäkyväksi.
            var fadeTimer = new Timer { Interval = 0.07 };
            fadeTimer.Timeout += delegate
            {
                byte c = 255;
                milkParticle.Color = new Color(c, c, c, (byte)(128 * milkParticle.LifetimeLeft.TotalSeconds / maxLife));
            };
            fadeTimer.Start();
            milkParticle.Destroyed += fadeTimer.Stop;

            // Random lentonopeus.
            var rx = RandomGen.NextDouble(-50, 50);
            var ry = RandomGen.NextDouble(-50, 50);
            milkParticle.Hit(new Vector(billy.FacingDirection.GetVector().X * (xBase + rx), yBase + ry));
        }
    }

    private void UseImprovement(HillBilly player)
    {
        if (player.Improvement == null)
        {

            CreateMilkParticles(player, 5, 100, 100, new Vector(0, player.Height/3), "tears");
            //for (int i = 0; i < 5; i++)
            //{
            //    const double maxLife = 1.0;
            //    PhysicsObject milkParticle = new PhysicsObject(5, 5, Shape.Circle);
            //    milkParticle.Color = new Color(255, 255, 255, 128);
            //    milkParticle.Position = player.Position + new Vector(0, player.Height / 3);
            //    milkParticle.IgnoresCollisionResponse = true;
            //    milkParticle.LifetimeLeft = TimeSpan.FromSeconds(maxLife);
            //    Add(milkParticle);

            //    // Väri muuttuu läpinäkyväksi.
            //    var fadeTimer = new Timer { Interval = 0.07 };
            //    fadeTimer.Timeout += delegate
            //    {
            //        byte c = 255;
            //        milkParticle.Color = new Color(c, c, c, (byte)(128 * milkParticle.LifetimeLeft.TotalSeconds / maxLife));
            //    };
            //    fadeTimer.Start();
            //    milkParticle.Destroyed += fadeTimer.Stop;

            //    // Random lentonopeus.
            //    var rx = RandomGen.NextDouble(-50, 50);
            //    var ry = RandomGen.NextDouble(-50, 50);
            //    milkParticle.Hit(new Vector(player.FacingDirection.GetVector().X * (100 + rx), 100 + ry));
            //}
            return;
        }

        player.UseImprovement(player.Improvement);
    }

    void Loss()
    {
        //TODO: Sumthin' flashy for our fallen friends.
        Exit();
    }

    void CollectMilk(PhysicsObject player, PhysicsObject milk)
    {
        HillBilly billy = player as HillBilly;
        if (billy == null)
            return;

        Improvement milkI = milk as Improvement;
        billy.GainImprovement(milkI);

        Remove(milk);
        //billy.AnimWalk = new Animation(milkWalk);
        //billy.AnimIdle = new Animation(milkWalk.CurrentFrame);
    }

    #region Camera
    void UpdateCamera()
    {
        double minY = players.Min(p => p.Y);
        double maxY = players.Max(p => p.Y);
        double minX = players.Min(p => p.X) + cameraOffset;

        Vector minPosition = new Vector(Math.Max(minX, cameraTargetX), minY);
        Vector maxPosition = new Vector(minX, maxY);

        cameraTarget = (minPosition + maxPosition) * 0.5;
        cameraTarget.X = Math.Max(cameraTargetX, minX);     //Lellllll.

        //cameraTarget.Y = Math.Max(cameraTarget.X, Level.Bottom + Window.Height/2.0);

        cameraTargetX = Math.Max(cameraTargetX, minX);

        cameraTarget.X = Math.Min(cameraTargetX, rightCamLimit);
        cameraTarget.Y = Math.Max(cameraTarget.Y, bottomCamLimit);

        double windowMax = Camera.ScreenToWorld(new Vector(Window.Width / 2.0, 0)).X;
        double windowMin = Camera.ScreenToWorld(new Vector(-Window.Width / 2.0, 0)).X;
        foreach (var player in players)
        {
            player.Left = Math.Max(player.Left, windowMin);
            player.Right = Math.Min(player.Right, windowMax);
        }
    }

    protected override void Update(Time time)
    {
        Camera.Position += (cameraTarget - Camera.Position) * time.SinceLastUpdate.TotalSeconds * cameraSpeed;
        //Camera.X += (cameraTargetX - Camera.X) * time.SinceLastUpdate.TotalSeconds * cameraSpeed;


        base.Update(time);
    }

    /// <summary>
    /// Yritän leikkiä kameralla. Vielä varmaan hetken pidempään.
    /// </summary>
    /// <param name="gameTime"></param>
    /*
    protected override void Update(Microsoft.Xna.Framework.GameTime gameTime)
    {
        foreach(HillBilly player in players)
        {
            playerPositionsX.Add(player.Position.X);
            playerPositionsY.Add(player.Position.Y);
        }

        double maxX = playerPositionsX.Max();
        double maxY = playerPositionsY.Max();
        double minX = playerPositionsX.Min();
        double minY = playerPositionsY.Min();

        Vector minPosition = new Vector(minX, minY);
        Vector maxPosition = new Vector(maxX, maxY);

        Camera.Position = (minPosition + maxPosition) * 0.5;

        playerPositionsX.Clear();
        playerPositionsY.Clear();

        base.Update(gameTime);
    }
     */
    #endregion
}