NPC-Lib

Asynchronous, high-performance Minecraft NPC library for 1.8-1.18 servers.

This Library does only support the latest patch release of a supported version (for example 1.13.2). Issues with older patch versions (for example 1.13.1) won't be fixed.

Requirements

This library can only be used on spigot servers higher or on version 1.8.8. The plugin ProtocolLib is required on your server.

How to use

Add the repository and dependency to your plugin:

Maven

<repository>
    <id>jitpack.io</id>
    <url>https://jitpack.io</url>
</repository>

<!-- latest stable release -->
<dependency>
    <groupId>com.github.juliarn</groupId>
    <artifactId>npc-lib</artifactId>
    <version>2.6-RELEASE</version>
</dependency>
<!-- latest build -->
<dependency>
    <groupId>com.github.juliarn</groupId>
    <artifactId>npc-lib</artifactId>
    <version>development-SNAPSHOT</version>
</dependency>

Gradle

maven {
    name 'jitpack.io'
    url 'https://jitpack.io'
}

// latest stable release
compile group: 'com.github.juliarn', name: 'npc-lib', version: '2.6-RELEASE'
// latest build
compile group: 'com.github.juliarn', name: 'npc-lib', version: 'development-SNAPSHOT'

Add ProtocolLib as dependency to your plugin.yml. It could look like this:

name: Hub
version: 1.0-SNAPSHOT
api-version: "1.13"
depend: [ProtocolLib]
author: juliarn
main: com.github.juliarn.server.hub.ServerHub

Now you're all set! You can start by creating an instance of the NPCPool and the NPC.Builder.

Example usage

public class ExampleNPCs implements Listener {

  /**
   * The NPC pool managing all NPCs.
   */
  private final NPCPool npcPool;

  private final Random random;

  /**
   * @param plugin The plugin which uses the lib
   */
  public ExampleNPCs(Plugin plugin) {
    this.npcPool = NPCPool.builder(plugin)
      .spawnDistance(60)
      .actionDistance(30)
      .tabListRemoveTicks(20)
      .build();
    this.random = new Random();

    // we are handling NPC events here
    Bukkit.getPluginManager().registerEvents(this, plugin);

    // making the NPCs randomly sneak and unsneak every second
    Bukkit.getScheduler().runTaskTimer(plugin, () -> {
      for (NPC npc : this.npcPool.getNPCs()) {
        npc.metadata()
          .queue(MetadataModifier.EntityMetadata.SNEAKING, this.random.nextBoolean())
          // sending the change to all players
          .send();
      }
    }, 20L, 20L);
  }

  /**
   * Appends a new NPC to the pool.
   *
   * @param location       The location the NPC will be spawned at
   * @param excludedPlayer A player which will not see the NPC
   */
  public void appendNPC(Location location, Player excludedPlayer) {
    // building the NPC
    NPC npc = NPC.builder()
      .profile(this.createProfile())
      .location(location)
      .imitatePlayer(false)
      .lookAtPlayer(false)
      // appending it to the NPC pool
      .build(this.npcPool);

    if (excludedPlayer != null) {
      // adding the excluded player which will not see the NPC
      npc.addExcludedPlayer(excludedPlayer);
    }
  }

  /**
   * Creates an example profile for NPCs.
   *
   * @return The new profile
   */
  public Profile createProfile() {
    Profile profile = new Profile(UUID.fromString("fdef0011-1c58-40c8-bfef-0bdcb1495938"));
    // Synchronously completing the profile, as we only created the profile with a UUID.
    // Through this, the name and textures will be filled in.
    profile.complete();

    // we want to keep the textures, but change the name and UUID.
    profile.setName("Notch");
    // with a UUID like this, the NPC can play LabyMod emotes!
    profile.setUniqueId(new UUID(this.random.nextLong(), 0));

    return profile;
  }

  /**
   * Doing something when a NPC is shown for a certain player.
   * Alternatively, {@link NPC.Builder#spawnCustomizer(SpawnCustomizer)} can be used.
   *
   * @param event The event instance
   */
  @EventHandler
  public void handleNPCShow(PlayerNPCShowEvent event) {
    NPC npc = event.getNPC();

    // sending the data only to the player from the event
    event.send(
      // making the NPC swing its main arm
      npc.animation()
        .queue(AnimationModifier.EntityAnimation.SWING_MAIN_ARM),
      // making the NPC play the LabyMod "dab" emote.
      // all ids can be found here: https://docs.labymod.net/pages/server/labymod/emote_api/
      npc.labymod()
        .queue(LabyModModifier.LabyModAction.EMOTE, 3),
      // equipping the NPC with a diamond chestplate
      npc.equipment()
        .queue(EquipmentModifier.CHEST, new ItemStack(Material.DIAMOND_CHESTPLATE, 1)),
      // enabling the skin layers and letting the NPC sneak
      npc.metadata()
        .queue(MetadataModifier.EntityMetadata.SKIN_LAYERS, true)
        .queue(MetadataModifier.EntityMetadata.SNEAKING, true));
  }

  /**
   * Doing something when a NPC is hidden for a certain player.
   *
   * @param event The event instance
   */
  @EventHandler
  public void handleNPCHide(PlayerNPCHideEvent event) {
    Player player = event.getPlayer();
    NPC npc = event.getNPC();

    // if the player has been excluded from seeing the NPC, removing him from the excluded players
    if (event.getReason() == PlayerNPCHideEvent.Reason.EXCLUDED) {
      npc.removeExcludedPlayer(player);
    }
  }

  /**
   * Doing something when a player interacts with a NPC.
   *
   * @param event The event instance
   */
  @EventHandler
  public void handleNPCInteract(PlayerNPCInteractEvent event) {
    Player player = event.getPlayer();
    NPC npc = event.getNPC();

    // checking if the player hit the NPC
    if (event.getUseAction() == PlayerNPCInteractEvent.EntityUseAction.ATTACK) {
      player.sendMessage("Why are you hitting me? :(");
      // making the NPC look at the player
      npc.rotation()
        .queueLookAt(player.getEyeLocation())
        // sending the change only to the player who interacted with the NPC
        .send(player);
    }
  }
}