flutter/examples/game/lib/game_objects.dart

part of game;

abstract class GameObject extends Node {
  GameObject(this.f);

  double radius = 0.0;
  double removeLimit = 1280.0;
  bool canDamageShip = true;
  bool canBeDamaged = true;
  bool canBeCollected = false;
  double maxDamage = 3.0;
  double damage = 0.0;

  final GameObjectFactory f;

  Paint _paintDebug = new Paint()
    ..color=new Color(0xffff0000)
    ..strokeWidth = 1.0
    ..style = ui.PaintingStyle.stroke;

  bool collidingWith(GameObject obj) {
    return (GameMath.distanceBetweenPoints(position, obj.position)
      < radius + obj.radius);
  }

  void move() {
  }

  void removeIfOffscreen(double scroll) {
    ;
    if (-position.y > scroll + removeLimit ||
        -position.y < scroll - 50.0) {
      removeFromParent();
    }
  }

  void destroy() {
    if (parent != null) {
      Explosion explo = createExplosion();
      if (explo != null) {
        explo.position = position;
        parent.addChild(explo);
      }

      Collectable powerUp = createPowerUp();
      if (powerUp != null) {
        f.addGameObject(powerUp, position);
      }

      removeFromParent();
    }
  }

  void collect() {
    removeFromParent();
  }

  void addDamage(double d) {
    if (!canBeDamaged) return;

    damage += d;
    if (damage >= maxDamage) {
      destroy();
      f.playerState.score += (maxDamage * 10).ceil();
    }
  }

  Explosion createExplosion() {
    return null;
  }

  Collectable createPowerUp() {
    return null;
  }

  void paint(PaintingCanvas canvas) {
    if (_drawDebug) {
      canvas.drawCircle(Point.origin, radius, _paintDebug);
    }
    super.paint(canvas);
  }

  void setupActions() {
  }
}

class LevelLabel extends GameObject {
  LevelLabel(GameObjectFactory f, int level) : super(f) {
    canDamageShip = false;
    canBeDamaged = false;

    Label lbl = new Label(
      "L E V E L $level",
      new TextStyle(
        textAlign: TextAlign.center,
        color:new Color(0xffffffff),
        fontSize: 24.0,
        fontWeight: FontWeight.w600
      ));
    addChild(lbl);
  }
}

class Ship extends GameObject {
  Ship(GameObjectFactory f) : super(f) {
    // Add main ship sprite
    _sprite = new Sprite(f.sheet["ship.png"]);
    _sprite.scale = 0.3;
    _sprite.rotation = -90.0;
    addChild(_sprite);

    _spriteShield = new Sprite(f.sheet["shield.png"]);
    _spriteShield.scale = 0.35;
    _spriteShield.transferMode = ui.TransferMode.plus;
    addChild(_spriteShield);

    radius = 20.0;
    canBeDamaged = false;
    canDamageShip = false;

    // Set start position
    position = new Point(0.0, 50.0);
  }

  Sprite _sprite;
  Sprite _spriteShield;

  void applyThrust(Point joystickValue, double scroll) {
    Point oldPos = position;
    Point target = new Point(joystickValue.x * 160.0, joystickValue.y * 220.0 - 250.0 - scroll);
    double filterFactor = 0.2;

    position = new Point(
      GameMath.filter(oldPos.x, target.x, filterFactor),
      GameMath.filter(oldPos.y, target.y, filterFactor));
  }

  void setupActions() {
    ActionTween rotate = new ActionTween((double a) { _spriteShield.rotation = a; }, 0.0, 360.0, 1.0);
    _spriteShield.actions.run(new ActionRepeatForever(rotate));
  }

  void update(double dt) {
    // Update shield
    if (f.playerState.shieldActive) {
      if (f.playerState.shieldDeactivating)
        _spriteShield.visible = !_spriteShield.visible;
      else
        _spriteShield.visible = true;
    } else {
      _spriteShield.visible = false;
    }
  }
}

class Laser extends GameObject {
  double impact = 0.0;

  final List<Color> laserColors = <Color>[
    new Color(0xff95f4fb),
    new Color(0xff5bff35),
    new Color(0xffff886c),
    new Color(0xffffd012),
    new Color(0xfffd7fff)
  ];

  Laser(GameObjectFactory f, int level, double r) : super(f) {
    // Game object properties
    radius = 10.0;
    removeLimit = _gameSizeHeight + radius;
    canDamageShip = false;
    canBeDamaged = false;
    impact = 1.0 + level * 0.5;

    // Offset for movement
    _offset = new Offset(
      math.cos(radians(r)) * 8.0,
      math.sin(radians(r)) * 8.0 - f.playerState.scrollSpeed);

    // Drawing properties
    rotation = r + 90.0;
    int numLasers = level % 3 + 1;
    Color laserColor = laserColors[(level ~/ 3) % laserColors.length];

    // Add sprites
    List<Sprite> sprites = <Sprite>[];
    for (int i = 0; i < numLasers; i++) {
      Sprite sprite = new Sprite(f.sheet["explosion_particle.png"]);
      sprite.scale = 0.5;
      sprite.colorOverlay = laserColor;
      sprite.transferMode = ui.TransferMode.plus;
      addChild(sprite);
      sprites.add(sprite);
    }

    // Position the individual sprites
    if (numLasers == 2) {
      sprites[0].position = new Point(-3.0, 0.0);
      sprites[1].position = new Point(3.0, 0.0);
    } else if (numLasers == 3) {
      sprites[0].position = new Point(-4.0, 0.0);
      sprites[1].position = new Point(4.0, 0.0);
      sprites[2].position = new Point(0.0, -2.0);
    }
  }

  Offset _offset;

  void move() {
    position += _offset;
  }

  Explosion createExplosion() {
    return new ExplosionMini(f.sheet);
  }
}

Color colorForDamage(double damage, double maxDamage) {
  int alpha = ((200.0 * damage) ~/ maxDamage).clamp(0, 200);
  return new Color.fromARGB(alpha, 255, 3, 86);
}

abstract class Obstacle extends GameObject {

  Obstacle(GameObjectFactory f) : super(f);

  double explosionScale = 1.0;

  Explosion createExplosion() {
    SoundEffectPlayer.sharedInstance().play(f.sounds["explosion"]);
    Explosion explo = new ExplosionBig(f.sheet);
    explo.scale = explosionScale;
    return explo;
  }
}

abstract class Asteroid extends Obstacle {
  Asteroid(GameObjectFactory f) : super(f);

  Sprite _sprite;

  void setupActions() {
    // Rotate obstacle
    int direction = 1;
    if (randomBool()) direction = -1;
    ActionTween rotate = new ActionTween(
      (double a) { _sprite.rotation = a; },
      0.0, 360.0 * direction, 5.0 + 5.0 * randomDouble());
    _sprite.actions.run(new ActionRepeatForever(rotate));
  }

  set damage(double d) {
    super.damage = d;
    _sprite.colorOverlay = colorForDamage(d, maxDamage);
  }

  Collectable createPowerUp() {
    return new Coin(f);
  }
}

class AsteroidBig extends Asteroid {
  AsteroidBig(GameObjectFactory f) : super(f) {
    _sprite = new Sprite(f.sheet["asteroid_big_${randomInt(3)}.png"]);
    _sprite.scale = 0.3;
    radius = 25.0;
    maxDamage = 5.0;
    addChild(_sprite);
  }
}

class AsteroidSmall extends Asteroid {
  AsteroidSmall(GameObjectFactory f) : super(f) {
    _sprite = new Sprite(f.sheet["asteroid_small_${randomInt(3)}.png"]);
    _sprite.scale = 0.3;
    radius = 12.0;
    maxDamage = 3.0;
    addChild(_sprite);
  }
}

class AsteroidPowerUp extends AsteroidBig {
  AsteroidPowerUp(GameObjectFactory f) : super(f);

  Collectable createPowerUp() {
    return new PowerUp(f, nextPowerUpType());
  }
}

class EnemyScout extends Obstacle {
  EnemyScout(GameObjectFactory f) : super(f) {
    _sprite = new Sprite(f.sheet["enemy_scout_0.png"]);
    _sprite.scale = 0.32;
    radius = 12.0;
    maxDamage = 1.0;
    addChild(_sprite);

    constraints = <Constraint>[new ConstraintRotationToMovement(dampening: 0.5)];
  }

  final double _swirlSpacing = 80.0;

  _addRandomSquare(List<Offset> offsets, double x, double y) {
    double xMove = (randomBool()) ? _swirlSpacing : -_swirlSpacing;
    double yMove = (randomBool()) ? _swirlSpacing : -_swirlSpacing;

    if (randomBool()) {
      offsets.addAll(<Offset>[
        new Offset(x, y),
        new Offset(xMove + x, y),
        new Offset(xMove + x, yMove + y),
        new Offset(x, yMove + y),
        new Offset(x, y)
      ]);
    } else {
      offsets.addAll(<Offset>[
        new Offset(x, y),
        new Offset(x, y + yMove),
        new Offset(xMove + x, yMove + y),
        new Offset(xMove + x, y),
        new Offset(x, y)
      ]);
    }
  }

  void setupActions() {

    List<Offset> offsets = <Offset>[];
    _addRandomSquare(offsets, -_swirlSpacing, 0.0);
    _addRandomSquare(offsets, _swirlSpacing, 0.0);
    offsets.add(new Offset(-_swirlSpacing, 0.0));

    List<Point> points = <Point>[];
    for (Offset offset in offsets) {
      points.add(position + offset);
    }

    ActionSpline spline = new ActionSpline((Point a) => position = a, points, 6.0);
    spline.tension = 0.7;
    actions.run(new ActionRepeatForever(spline));
  }

  Collectable createPowerUp() {
    return new Coin(f);
  }

  Sprite _sprite;
}

class EnemyDestroyer extends Obstacle {
  EnemyDestroyer(GameObjectFactory f) : super(f) {
    _sprite = new Sprite(f.sheet["enemy_destroyer_1.png"]);
    _sprite.scale = 0.32;
    radius = 24.0;
    maxDamage = 4.0;
    addChild(_sprite);

    constraints = <Constraint>[new ConstraintRotationToNode(f.level.ship, dampening: 0.05)];
  }

  int _countDown = randomInt(120) + 240;

  void setupActions() {
    ActionCircularMove circle = new ActionCircularMove(
      (Point a) { position = a; },
      position, 40.0,
      360.0 * randomDouble(),
      randomBool(),
      3.0);
    actions.run(new ActionRepeatForever(circle));
  }

  Collectable createPowerUp() {
    return new Coin(f);
  }

  void update(double dt) {
    _countDown -= 1;
    if (_countDown <= 0) {
      // Shoot at player
      EnemyLaser laser = new EnemyLaser(f, rotation, 5.0, new Color(0xffffe38e));
      laser.position = position;
      f.level.addChild(laser);

      _countDown = 60 + randomInt(120);
    }
  }

  set damage(double d) {
    super.damage = d;
    _sprite.colorOverlay = colorForDamage(d, maxDamage);
  }

  Sprite _sprite;
}

class EnemyLaser extends Obstacle {
  EnemyLaser(GameObjectFactory f, double rotation, double speed, Color color) : super(f) {
    _sprite = new Sprite(f.sheet["explosion_particle.png"]);
    _sprite.scale = 0.5;
    _sprite.rotation = rotation + 90;
    _sprite.colorOverlay = color;
    addChild(_sprite);

    canDamageShip = true;
    canBeDamaged = false;

    double rad = radians(rotation);
    _movement = new Offset(math.cos(rad) * speed, math.sin(rad) * speed);
  }

  Sprite _sprite;
  Offset _movement;

  void move() {
    position += _movement;
  }
}

class EnemyBoss extends Obstacle {
  EnemyBoss(GameObjectFactory f) : super(f) {
    radius = 48.0;
    _sprite = new Sprite(f.sheet["enemy_destroyer_1.png"]);
    _sprite.scale = 0.64;
    addChild(_sprite);
    maxDamage = 40.0;

    constraints = <Constraint>[new ConstraintRotationToNode(f.level.ship, dampening: 0.05)];

    _powerBar = new PowerBar(new Size(60.0, 10.0));
    _powerBar.pivot = new Point(0.5, 0.5);
    f.level.addChild(_powerBar);
    _powerBar.constraints = <Constraint>[new ConstraintPositionToNode(
      this,
      dampening: 0.5,
      offset: new Offset(0.0, -70.0)
    )];
  }

  Sprite _sprite;
  PowerBar _powerBar;

  int _countDown = randomInt(120) + 240;

  void update(double dt) {
    _countDown -= 1;
    if (_countDown <= 0) {
      // Shoot at player
      fire(10.0);
      fire(0.0);
      fire(-10.0);

      _countDown = 60 + randomInt(120);
    }
  }

  void fire(double r) {
    r += rotation;
    EnemyLaser laser = new EnemyLaser(f, r, 5.0, new Color(0xffffe38e));

    double rad = radians(r);
    Offset startOffset = new Offset(math.cos(rad) * 30.0, math.sin(rad) * 30.0);

    laser.position = position + startOffset;
    f.level.addChild(laser);
  }

  void setupActions() {
    ActionOscillate oscillate = new ActionOscillate((Point a) { position = a; }, position, 120.0, 3.0);
    actions.run(new ActionRepeatForever(oscillate));
  }

  void destroy() {
    f.playerState.boss = null;
    _powerBar.removeFromParent();

    // Flash the screen
    NodeWithSize screen = f.playerState.parent;
    screen.addChild(new Flash(screen.size, 1.0));
    super.destroy();

    // Add coins
    for (int i = 0; i < 20; i++) {
      Coin coin = new Coin(f);
      Point pos = new Point(
        randomSignedDouble() * 160,
        position.y + randomSignedDouble() * 160.0);
      f.addGameObject(coin, pos);
    }
  }

  Explosion createExplosion() {
    ExplosionBig explo = new ExplosionBig(f.sheet);
    explo.scale = 1.5;
    return explo;
  }

  set damage(double d) {
    super.damage = d;
    _sprite.actions.stopAll();
    _sprite.actions.run(new ActionTween(
      (Color a) { _sprite.colorOverlay = a; },
      new Color.fromARGB(180, 255, 3, 86),
      new Color(0x00000000),
      0.3
    ));

    _powerBar.power = (1.0 - (damage / maxDamage)).clamp(0.0, 1.0);
  }
}

class Collectable extends GameObject {
  Collectable(GameObjectFactory f) : super(f) {
    canDamageShip = false;
    canBeDamaged = false;
    canBeCollected = true;

    zPosition = 20.0;
  }
}

class Coin extends Collectable {
  Coin(GameObjectFactory f) : super(f) {
    _sprite = new Sprite(f.sheet["coin.png"]);
    _sprite.scale = 0.7;
    addChild(_sprite);

    radius = 7.5;
  }

  void setupActions() {
    // Rotate
    ActionTween rotate = new ActionTween((double a) { _sprite.rotation = a; }, 0.0, 360.0, 1.0);
    actions.run(new ActionRepeatForever(rotate));

    // Fade in
    ActionTween fadeIn = new ActionTween((double a) { _sprite.opacity = a; }, 0.0, 1.0, 0.6);
    actions.run(fadeIn);
  }

  Sprite _sprite;

  void collect() {
    f.playerState.addCoin(this);
    super.collect();
  }
}

enum PowerUpType {
  shield,
  speedLaser,
  sideLaser,
  speedBoost,
}

List<PowerUpType> _powerUpTypes = new List<PowerUpType>.from(PowerUpType.values);
int _lastPowerUp = _powerUpTypes.length;

PowerUpType nextPowerUpType() {
  if (_lastPowerUp >= _powerUpTypes.length) {
     _powerUpTypes.shuffle();
     _lastPowerUp = 0;
  }

  PowerUpType type = _powerUpTypes[_lastPowerUp];
  _lastPowerUp++;

  return type;
}

class PowerUp extends Collectable {
  PowerUp(GameObjectFactory f, this.type) : super(f) {
    _sprite = new Sprite(f.sheet["coin.png"]);
    _sprite.scale = 1.2;
    addChild(_sprite);

    radius = 10.0;
  }

  Sprite _sprite;
  PowerUpType type;

  void setupActions() {
    ActionTween rotate = new ActionTween((double a) { _sprite.rotation = a; }, 0.0, 360.0, 1.0);
    actions.run(new ActionRepeatForever(rotate));

    // Fade in
    ActionTween fadeIn = new ActionTween((double a) { _sprite.opacity = a; }, 0.0, 1.0, 0.6);
    actions.run(fadeIn);
  }

  void collect() {
    f.playerState.activatePowerUp(type);
    super.collect();
  }
}