149 lines
6.8 KiB
Java
149 lines
6.8 KiB
Java
/*
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* Copyright (c) 2018 Jitse Boonstra
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*/
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package net.jitse.npclib.nms.holograms;
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import com.comphenix.tinyprotocol.Reflection;
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import org.bukkit.Location;
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import org.bukkit.World;
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import org.bukkit.entity.Player;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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/**
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* @author Jitse Boonstra
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*/
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public class Hologram {
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private final double delta = 0.3;
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private List<Object> armorStands = new ArrayList<>();
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private Set<Object> spawnPackets = new HashSet<>();
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private Set<Object> destroyPackets = new HashSet<>();
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// Classes:
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private static final Class<?> ENTITY_ARMOR_STAND_CLAZZ = Reflection.getMinecraftClass("EntityArmorStand");
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private static final Class<?> ENTITY_LIVING_CLAZZ = Reflection.getMinecraftClass("EntityLiving");
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private static final Class<?> ENTITY_CLAZZ = Reflection.getMinecraftClass("Entity");
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private static final Class<?> CRAFT_BUKKIT_CLASS = Reflection.getCraftBukkitClass("CraftWorld");
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private static final Class<?> CRAFT_PLAYER_CLAZZ = Reflection.getCraftBukkitClass("entity.CraftPlayer");
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private static final Class<?> PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CLAZZ = Reflection.getMinecraftClass(
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"PacketPlayOutSpawnEntityLiving");
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private static final Class<?> PACKET_PLAY_OUT_ENTITY_DESTROY_CLAZZ = Reflection.getMinecraftClass(
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"PacketPlayOutEntityDestroy");
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private static final Class<?> ENTITY_PLAYER_CLAZZ = Reflection.getMinecraftClass("EntityPlayer");
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private static final Class<?> PLAYER_CONNECTION_CLAZZ = Reflection.getMinecraftClass("PlayerConnection");
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private static final Class<?> PACKET_CLAZZ = Reflection.getMinecraftClass("Packet");
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// Constructors:
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private static final Reflection.ConstructorInvoker PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CONSTRUCTOR = Reflection
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.getConstructor(PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CLAZZ, ENTITY_LIVING_CLAZZ);
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private static final Reflection.ConstructorInvoker PACKET_PLAY_OUT_ENTITY_DESTROY_CONSTRUCTOR = Reflection
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.getConstructor(PACKET_PLAY_OUT_ENTITY_DESTROY_CLAZZ, int[].class);
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// Fields:
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private static final Reflection.FieldAccessor playerConnectionField = Reflection.getField(ENTITY_PLAYER_CLAZZ,
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"playerConnection", PLAYER_CONNECTION_CLAZZ);
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// Methods:
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private static final Reflection.MethodInvoker SET_LOCATION_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setLocation", double.class, double.class, double.class, float.class, float.class);
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private static final Reflection.MethodInvoker SET_CUSTOM_NAME_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setCustomName", String.class);
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private static final Reflection.MethodInvoker SET_CUSTOM_NAME_VISIBLE_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setCustomNameVisible", boolean.class);
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private static final Reflection.MethodInvoker SET_SMALL_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setSmall", boolean.class);
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private static final Reflection.MethodInvoker SET_INVISIBLE_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setInvisible", boolean.class);
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private static final Reflection.MethodInvoker SET_BASE_PLATE_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setBasePlate", boolean.class);
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private static final Reflection.MethodInvoker SET_ARMS_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setArms", boolean.class);
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private static final Reflection.MethodInvoker PLAYER_GET_HANDLE_METHOD = Reflection.getMethod(CRAFT_PLAYER_CLAZZ,
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"getHandle");
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private static final Reflection.MethodInvoker SEND_PACKET_METHOD = Reflection.getMethod(PLAYER_CONNECTION_CLAZZ,
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"sendPacket", PACKET_CLAZZ);
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private static final Reflection.MethodInvoker GET_ID_METHOD = Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"getId");
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private final Location start;
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private final List<String> lines;
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private final Object worldServer;
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public Hologram(Location location, List<String> lines) {
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this.start = location;
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this.lines = lines;
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this.worldServer = Reflection.getMethod(CRAFT_BUKKIT_CLASS, "getHandle")
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.invoke(CRAFT_BUKKIT_CLASS.cast(location.getWorld()));
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}
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public void generatePackets(boolean above1_9_r2) {
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Reflection.MethodInvoker gravityMethod = (above1_9_r2 ? Reflection.getMethod(ENTITY_CLAZZ,
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"setNoGravity", boolean.class) : Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ,
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"setGravity", boolean.class));
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Location location = start.clone().add(0, delta * lines.size(), 0);
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Class<?> worldClass = worldServer.getClass().getSuperclass();
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if (start.getWorld().getEnvironment() != World.Environment.NORMAL) {
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worldClass = worldClass.getSuperclass();
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}
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Reflection.ConstructorInvoker entityArmorStandConstructor = Reflection
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.getConstructor(ENTITY_ARMOR_STAND_CLAZZ, worldClass);
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for (String line : lines) {
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Object entityArmorStand = entityArmorStandConstructor.invoke(worldServer);
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SET_LOCATION_METHOD.invoke(entityArmorStand, location.getX(), location.getY(), location.getZ(), 0, 0);
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SET_CUSTOM_NAME_METHOD.invoke(entityArmorStand, line);
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SET_CUSTOM_NAME_VISIBLE_METHOD.invoke(entityArmorStand, true);
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gravityMethod.invoke(entityArmorStand, above1_9_r2);
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SET_SMALL_METHOD.invoke(entityArmorStand, true);
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SET_INVISIBLE_METHOD.invoke(entityArmorStand, true);
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SET_BASE_PLATE_METHOD.invoke(entityArmorStand, false);
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SET_ARMS_METHOD.invoke(entityArmorStand, false);
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location.subtract(0, delta, 0);
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if (line.isEmpty()) {
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continue;
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}
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armorStands.add(entityArmorStand);
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Object spawnPacket = PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CONSTRUCTOR.invoke(entityArmorStand);
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spawnPackets.add(spawnPacket);
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Object destroyPacket = PACKET_PLAY_OUT_ENTITY_DESTROY_CONSTRUCTOR
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.invoke(new int[]{(int) GET_ID_METHOD.invoke(entityArmorStand)});
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destroyPackets.add(destroyPacket);
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}
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}
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public void spawn(Player player) {
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Object playerConnection = playerConnectionField.get(PLAYER_GET_HANDLE_METHOD
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.invoke(CRAFT_PLAYER_CLAZZ.cast(player)));
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for (Object packet : spawnPackets) {
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SEND_PACKET_METHOD.invoke(playerConnection, packet);
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}
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}
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public void destroy(Player player) {
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Object playerConnection = playerConnectionField.get(PLAYER_GET_HANDLE_METHOD
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.invoke(CRAFT_PLAYER_CLAZZ.cast(player)));
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for (Object packet : destroyPackets) {
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SEND_PACKET_METHOD.invoke(playerConnection, packet);
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}
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}
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}
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