Custom Entity Implementations

While LITIENGINE provides built-in entity types like Creature, Prop, and CombatEntity, you’ll often need custom implementations for specialized game objects.

Extending Existing Types

The easiest approach is to extend an existing entity type:

@EntityInfo(width = 32, height = 32)
@MovementInfo(velocity = 50)
@CombatInfo(hitpoints = 100)
public class Player extends Creature {

  private int experience;
  private List<Ability> abilities;

  public Player() {
    super("player");
    this.abilities = new ArrayList<>();
  }

  public void addExperience(int xp) {
    this.experience += xp;
    checkLevelUp();
  }

  public int getExperience() {
    return experience;
  }

  private void checkLevelUp() {
    // Level up logic
  }
}

Creating from Scratch

For unique behaviors, extend Entity directly:

@EntityInfo(width = 64, height = 64)
public class Portal extends Entity implements IUpdateable {

  private String targetMap;
  private String targetSpawnpoint;
  private boolean active;

  public Portal() {
    super("portal");
    Game.loop().attach(this);
  }

  @Override
  public void update() {
    if (!active) return;

    // Check for player collision
    Player player = Player.instance();
    if (this.getBoundingBox().contains(player.getCenter())) {
      teleport(player);
    }
  }

  private void teleport(Player player) {
    Game.world().loadEnvironment(targetMap);
    Game.world().environment().getSpawnpoint(targetSpawnpoint).spawn(player);
  }

  public void setTarget(String map, String spawnpoint) {
    this.targetMap = map;
    this.targetSpawnpoint = spawnpoint;
  }

  @Override
  public void dispose() {
    Game.loop().detach(this);
    super.dispose();
  }
}

Overriding Controller Creation

Control which controllers your entity uses:

public class FlyingEnemy extends Creature {

  @Override
  protected IMovementController createMovementController() {
    // Use custom flying movement
    return new FlyingMovementController<>(this);
  }

  @Override
  protected IEntityAnimationController<?> createAnimationController() {
    // Custom animation logic
    return new FlyingAnimationController(this);
  }
}

Custom Rendering

Override rendering for unique visual effects:

public class Ghost extends Creature {

  @Override
  public void render(Graphics2D g) {
    // Set ghost effect
    Composite old = g.getComposite();
    g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f));

    super.render(g);

    g.setComposite(old);
  }
}

Custom Entity Implementations

Extending Existing Types

Creating from Scratch

Overriding Controller Creation

Custom Rendering

See Also

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