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BossHealthBar.java
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BossHealthBar.java
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package net.aufdemrand.denizen.utilities.packets;
import net.minecraft.server.v1_8_R1.PacketPlayInClientCommand;
import net.minecraft.server.v1_8_R1.PacketPlayOutEntityDestroy;
import net.minecraft.server.v1_8_R1.PacketPlayOutEntityMetadata;
import net.minecraft.server.v1_8_R1.PacketPlayOutSpawnEntityLiving;
import net.minecraft.server.v1_8_R1.EnumClientCommand;
import net.minecraft.server.v1_8_R1.DataWatcher;
import net.aufdemrand.denizen.utilities.DenizenAPI;
import net.aufdemrand.denizen.utilities.debugging.dB;
import org.bukkit.Location;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.scheduler.BukkitRunnable;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
// Retrieved from https://forums.bukkit.org/threads/tutorial-utilizing-the-boss-health-bar.158018/
// Modified for usage by Denizen
// Original code by chasechocolate
// Modified by ftbastler for Minecraft 1.7
public class BossHealthBar {
public static final int ENTITY_ID = 1234567;
private static HashMap<String, Boolean> hasHealthBar = new HashMap<String, Boolean>();
// Keep track of fields to avoid unnecessarily getting them repeatedly
private static final Field spawn_entityId, spawn_entityType, spawn_locationX, spawn_locationY, spawn_locationZ,
spawn_velocityX, spawn_velocityY, spawn_velocityZ, spawn_yaw, spawn_pitch, spawn_headPitch, spawn_data;
private static final Field destroy_entityList;
private static final Field metadata_entityId, metadata_data;
private static final Field ccommand_command;
static {
Map<String, Field> fields = PacketHelper.registerFields(PacketPlayOutSpawnEntityLiving.class);
spawn_entityId = fields.get("a");
spawn_entityType = fields.get("b");
spawn_locationX = fields.get("c");
spawn_locationY = fields.get("d");
spawn_locationZ = fields.get("e");
spawn_velocityX = fields.get("f");
spawn_velocityY = fields.get("g");
spawn_velocityZ = fields.get("h");
spawn_yaw = fields.get("i");
spawn_pitch = fields.get("j");
spawn_headPitch = fields.get("k");
spawn_data = fields.get("l");
fields = PacketHelper.registerFields(PacketPlayOutEntityDestroy.class);
destroy_entityList = fields.get("a");
fields = PacketHelper.registerFields(PacketPlayOutEntityMetadata.class);
metadata_entityId = fields.get("a");
metadata_data = fields.get("b");
fields = PacketHelper.registerFields(PacketPlayInClientCommand.class);
ccommand_command = fields.get("a");
}
//Accessing packets
@SuppressWarnings("deprecation")
public static PacketPlayOutSpawnEntityLiving getMobPacket(String text, Location loc, int health) {
PacketPlayOutSpawnEntityLiving mobPacket = new PacketPlayOutSpawnEntityLiving();
try {
spawn_entityId.set(mobPacket, ENTITY_ID);
spawn_entityType.set(mobPacket, (byte) EntityType.ENDER_DRAGON.getTypeId());
spawn_locationX.set(mobPacket, (int) Math.floor(loc.getBlockX() * 32.0D));
spawn_locationY.set(mobPacket, -256 * 32);
spawn_locationZ.set(mobPacket, (int) Math.floor(loc.getBlockZ() * 32.0D));
spawn_velocityX.set(mobPacket, (byte) 0);
spawn_velocityY.set(mobPacket, (byte) 0);
spawn_velocityZ.set(mobPacket, (byte) 0);
spawn_yaw.set(mobPacket, (byte) 0);
spawn_pitch.set(mobPacket, (byte) 0);
spawn_headPitch.set(mobPacket, (byte) 0);
spawn_data.set(mobPacket, getWatcher(text, health));
} catch (Exception e) {
dB.echoError(e);
}
return mobPacket;
}
public static PacketPlayOutEntityDestroy getDestroyEntityPacket() {
PacketPlayOutEntityDestroy destroyPacket = new PacketPlayOutEntityDestroy();
try {
destroy_entityList.set(destroyPacket, new int[]{ENTITY_ID});
} catch (Exception e) {
dB.echoError(e);
}
return destroyPacket;
}
public static PacketPlayOutEntityMetadata getMetadataPacket(DataWatcher watcher) {
PacketPlayOutEntityMetadata metaPacket = new PacketPlayOutEntityMetadata();
try {
metadata_entityId.set(metaPacket, ENTITY_ID);
metadata_data.set(metaPacket, watcher.c());
} catch (Exception e) {
dB.echoError(e);
}
return metaPacket;
}
public static PacketPlayInClientCommand getRespawnPacket() {
PacketPlayInClientCommand ccommandPacket = new PacketPlayInClientCommand();
try {
ccommand_command.set(ccommandPacket, EnumClientCommand.PERFORM_RESPAWN);
} catch (Exception e) {
dB.echoError(e);
}
return ccommandPacket;
}
public static DataWatcher getWatcher(String text, int health) {
DataWatcher watcher = new DataWatcher(null);
watcher.a(0, (byte) 0x20); //Flags, 0x20 = invisible
watcher.a(6, (float) health);
watcher.a(10, text); //Entity name
watcher.a(11, (byte) 1); //Show name, 1 = show, 0 = don't show
return watcher;
}
//Other methods
public static void displayTextBar(String text, final Player player, int health) {
PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(text, player.getLocation(), health);
PacketHelper.sendPacket(player, mobPacket);
hasHealthBar.put(player.getName(), true);
}
public static void removeTextBar(Player player) {
if (hasHealthBar.containsKey(player.getName())) {
PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
PacketHelper.sendPacket(player, destroyEntityPacket);
hasHealthBar.put(player.getName(), false);
}
}
public static void displayLoadingBar(final String text, final String completeText, final Player player, final int healthAdd, final long delay, final boolean loadUp) {
PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(text, player.getLocation(), 200);
PacketHelper.sendPacket(player, mobPacket);
hasHealthBar.put(player.getName(), true);
new BukkitRunnable() {
int health = (loadUp ? 0 : 300);
@Override
public void run() {
if ((loadUp ? health < 300 : health > 0)) {
DataWatcher watcher = getWatcher(text, health);
PacketPlayOutEntityMetadata metaPacket = getMetadataPacket(watcher);
PacketHelper.sendPacket(player, metaPacket);
if (loadUp) {
health += healthAdd;
} else {
health -= healthAdd;
}
} else {
DataWatcher watcher = getWatcher(text, (loadUp ? 300 : 0));
PacketPlayOutEntityMetadata metaPacket = getMetadataPacket(watcher);
PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
PacketHelper.sendPacket(player, metaPacket);
PacketHelper.sendPacket(player, destroyEntityPacket);
hasHealthBar.put(player.getName(), false);
//Complete text
PacketPlayOutSpawnEntityLiving mobPacket = getMobPacket(completeText, player.getLocation(), 200);
PacketHelper.sendPacket(player, mobPacket);
hasHealthBar.put(player.getName(), true);
DataWatcher watcher2 = getWatcher(completeText, 300);
PacketPlayOutEntityMetadata metaPacket2 = getMetadataPacket(watcher2);
PacketHelper.sendPacket(player, metaPacket2);
new BukkitRunnable() {
@Override
public void run() {
PacketPlayOutEntityDestroy destroyEntityPacket = getDestroyEntityPacket();
PacketHelper.sendPacket(player, destroyEntityPacket);
hasHealthBar.put(player.getName(), false);
}
}.runTaskLater(DenizenAPI.getCurrentInstance(), 40L);
this.cancel();
}
}
}.runTaskTimer(DenizenAPI.getCurrentInstance(), delay, delay);
}
public static void displayLoadingBar(final String text, final String completeText, final Player player, final int secondsDelay, final boolean loadUp) {
final int healthChangePerSecond = 300 / secondsDelay;
displayLoadingBar(text, completeText, player, healthChangePerSecond, 20L, loadUp);
}
}