217 lines
11 KiB
Java
217 lines
11 KiB
Java
/*
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* Copyright (c) 2018 Jitse Boonstra
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*/
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package net.jitse.npclib.hologram;
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import com.comphenix.tinyprotocol.Reflection;
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import net.jitse.npclib.internal.MinecraftVersion;
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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.List;
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public class Hologram {
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private final List<Object> armorStands = new ArrayList<>();
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private final List<Object> showPackets = new ArrayList<>();
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private final List<Object> hidePackets = new ArrayList<>();
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private static final double DELTA = 0.3;
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// Classes:
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private static final Class<?> CHAT_COMPONENT_TEXT_CLAZZ = Reflection.getMinecraftClass("ChatComponentText");
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private static final Class<?> CHAT_BASE_COMPONENT_CLAZZ = Reflection.getMinecraftClass("IChatBaseComponent");
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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<?> PACKET_PLAY_OUT_ENTITY_METADATA_CLAZZ = Reflection.getMinecraftClass(
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"PacketPlayOutEntityMetadata");
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private static final Class<?> DATAWATCHER_CLAZZ = Reflection.getMinecraftClass("DataWatcher");
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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 CHAT_COMPONENT_TEXT_CONSTRUCTOR = Reflection
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.getConstructor(CHAT_COMPONENT_TEXT_CLAZZ, String.class);
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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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private static final Reflection.ConstructorInvoker PACKET_PLAY_OUT_ENTITY_METADATA_CONSTRUCTOR = Reflection
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.getConstructor(PACKET_PLAY_OUT_ENTITY_METADATA_CLAZZ, int.class, DATAWATCHER_CLAZZ, boolean.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_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 static final Reflection.MethodInvoker GET_DATAWATCHER_METHOD = Reflection.getMethod(ENTITY_CLAZZ,
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"getDataWatcher");
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private final MinecraftVersion version;
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private final Location start;
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private final Object worldServer;
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private List<String> text;
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public Hologram(MinecraftVersion version, Location location, List<String> text) {
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this.version = version;
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this.start = location;
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this.text = text;
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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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createPackets();
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}
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private void createPackets() {
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// TODO: Check when this method was changed (1.9 R2 is giving an exception...)
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Reflection.MethodInvoker gravityMethod = (version.isAboveOrEqual(MinecraftVersion.V1_9_R2) ?
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Reflection.getMethod(ENTITY_CLAZZ, "setNoGravity", boolean.class) :
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Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ, "setGravity", boolean.class));
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Reflection.MethodInvoker customNameMethod = (version.isAboveOrEqual(MinecraftVersion.V1_12_R1)
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? Reflection.getMethod(ENTITY_CLAZZ, "setCustomName", version.isAboveOrEqual(MinecraftVersion.V1_13_R1) ? CHAT_BASE_COMPONENT_CLAZZ : String.class)
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: Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ, "setCustomName", String.class));
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Reflection.MethodInvoker customNameVisibilityMethod = (version.isAboveOrEqual(MinecraftVersion.V1_12_R1) ?
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Reflection.getMethod(ENTITY_CLAZZ, "setCustomNameVisible", boolean.class) :
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Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ, "setCustomNameVisible", boolean.class));
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Location location = start.clone().add(0, DELTA * text.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 = (version.isAboveOrEqual(MinecraftVersion.V1_14_R1) ?
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Reflection.getConstructor(ENTITY_ARMOR_STAND_CLAZZ, worldClass, double.class, double.class, double.class) :
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Reflection.getConstructor(ENTITY_ARMOR_STAND_CLAZZ, worldClass));
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for (String line : text) {
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Object entityArmorStand = (version.isAboveOrEqual(MinecraftVersion.V1_14_R1) ?
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entityArmorStandConstructor.invoke(worldServer, location.getX(), location.getY(), location.getZ()) :
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entityArmorStandConstructor.invoke(worldServer));
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if (!version.isAboveOrEqual(MinecraftVersion.V1_14_R1)) {
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SET_LOCATION_METHOD.invoke(entityArmorStand, location.getX(), location.getY(), location.getZ(), 0, 0);
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}
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customNameMethod.invoke(entityArmorStand, version.isAboveOrEqual(MinecraftVersion.V1_13_R1) ?
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CHAT_COMPONENT_TEXT_CONSTRUCTOR.invoke(line) : line);
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customNameVisibilityMethod.invoke(entityArmorStand, true);
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gravityMethod.invoke(entityArmorStand, version.isAboveOrEqual(MinecraftVersion.V1_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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armorStands.add(entityArmorStand);
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// Create and add the associated show and hide packets.
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showPackets.add(PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CONSTRUCTOR.invoke(entityArmorStand));
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hidePackets.add(PACKET_PLAY_OUT_ENTITY_DESTROY_CONSTRUCTOR
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.invoke(new int[]{(int) GET_ID_METHOD.invoke(entityArmorStand)}));
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location.subtract(0, DELTA, 0);
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}
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}
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public List<Object> getUpdatePackets(List<String> text) {
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List<Object> updatePackets = new ArrayList<>();
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if (this.text.size() != text.size()) {
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throw new IllegalArgumentException("When updating the text, the old and new text should have the same amount of lines");
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}
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Reflection.MethodInvoker customNameMethod = (version.isAboveOrEqual(MinecraftVersion.V1_12_R1)
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? Reflection.getMethod(ENTITY_CLAZZ, "setCustomName", version.isAboveOrEqual(MinecraftVersion.V1_13_R1) ? CHAT_BASE_COMPONENT_CLAZZ : String.class)
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: Reflection.getMethod(ENTITY_ARMOR_STAND_CLAZZ, "setCustomName", String.class));
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for (int i = 0; i < text.size(); i++) {
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Object entityArmorStand = armorStands.get(i);
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String oldLine = this.text.get(i);
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String newLine = text.get(i);
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customNameMethod.invoke(entityArmorStand, version.isAboveOrEqual(MinecraftVersion.V1_13_R1) ?
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CHAT_COMPONENT_TEXT_CONSTRUCTOR.invoke(newLine) : newLine); // Update the DataWatcher object.
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showPackets.set(i, PACKET_PLAY_OUT_SPAWN_ENTITY_LIVING_CONSTRUCTOR.invoke(entityArmorStand));
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if (newLine.isEmpty() && !oldLine.isEmpty()) {
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updatePackets.add(hidePackets.get(i));
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} else if (!newLine.isEmpty() && oldLine.isEmpty()) {
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updatePackets.add(showPackets.get(i));
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} else if (!oldLine.equals(newLine)) {
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// Update the line for all players using a Metadata packet.
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updatePackets.add(PACKET_PLAY_OUT_ENTITY_METADATA_CONSTRUCTOR.invoke(
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GET_ID_METHOD.invoke(entityArmorStand),
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GET_DATAWATCHER_METHOD.invoke(entityArmorStand),
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true
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));
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}
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}
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this.text = text;
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return updatePackets;
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}
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public void update(Player player, List<Object> updatePackets) {
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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 : updatePackets) {
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SEND_PACKET_METHOD.invoke(playerConnection, packet);
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}
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}
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public void show(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 (int i = 0; i < text.size(); i++) {
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if (text.get(i).isEmpty()) continue; // No need to spawn the line.
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SEND_PACKET_METHOD.invoke(playerConnection, showPackets.get(i));
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}
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}
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public void hide(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 (int i = 0; i < text.size(); i++) {
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if (text.get(i).isEmpty()) continue; // No need to hide the line (as it was never spawned).
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SEND_PACKET_METHOD.invoke(playerConnection, hidePackets.get(i));
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}
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}
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}
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