chaseking · July 21, 2013 22:15 · Jul 21, 2013
diff --git a/Utilizing the Boss Health Bar b/Utilizing the Boss Health Bar
@@ -0,0 +1,187 @@
+package com.chasechocolate.example;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+
+import net.minecraft.server.v1_6_R2.DataWatcher;
+import net.minecraft.server.v1_6_R2.EntityPlayer;
+import net.minecraft.server.v1_6_R2.Packet;
+import net.minecraft.server.v1_6_R2.Packet205ClientCommand;
+import net.minecraft.server.v1_6_R2.Packet24MobSpawn;
+import net.minecraft.server.v1_6_R2.Packet29DestroyEntity;
+import net.minecraft.server.v1_6_R2.Packet40EntityMetadata;
+
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_6_R2.entity.CraftPlayer;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitRunnable;
+
+public class PacketUtils {
+  public static final int ENTITY_ID = 1234;
+
+	private static HashMap<String, Boolean> hasHealthBar = new HashMap<String, Boolean>();
+
+	public static void sendPacket(Player player, Packet packet){
+		EntityPlayer entityPlayer = ((CraftPlayer) player).getHandle();
+
+		entityPlayer.playerConnection.sendPacket(packet);
+	}
+
+	//Accessing packets
+	public static Packet24MobSpawn getMobPacket(String text, Location loc){
+		Packet24MobSpawn mobPacket = new Packet24MobSpawn();
+
+		mobPacket.a = (int) ENTITY_ID; //Entity ID
+		mobPacket.b = (byte) EntityType.WITHER.getTypeId(); //Mob type (ID: 64)
+		mobPacket.c = (int) Math.floor(loc.getBlockX() * 32.0D); //X position
+		mobPacket.d = (int) Math.floor(loc.getBlockY() * 32.0D); //Y position
+		mobPacket.e = (int) Math.floor(loc.getBlockZ() * 32.0D); //Z position
+		mobPacket.f = (byte) 0; //Pitch
+		mobPacket.g = (byte) 0; //Head Pitch
+		mobPacket.h = (byte) 0; //Yaw
+		mobPacket.i = (short) 0; //X velocity
+		mobPacket.j = (short) 0; //Y velocity
+		mobPacket.k = (short) 0; //Z velocity
+
+		DataWatcher watcher = getWatcher(text, 300);
+
+		try{
+			Field t = Packet24MobSpawn.class.getDeclaredField("t");
+
+			t.setAccessible(true);
+			t.set(mobPacket, watcher);
+		} catch(Exception e){
+			e.printStackTrace();
+		}
+
+		return mobPacket;
+	}
+
+	public static Packet29DestroyEntity getDestroyEntityPacket(){
+		Packet29DestroyEntity packet = new Packet29DestroyEntity();
+
+		packet.a = new int[]{ENTITY_ID};
+
+		return packet;
+	}
+
+	public static Packet40EntityMetadata getMetadataPacket(DataWatcher watcher){
+		Packet40EntityMetadata metaPacket = new Packet40EntityMetadata();
+
+		metaPacket.a = (int) ENTITY_ID;
+
+		try{
+			Field b = Packet40EntityMetadata.class.getDeclaredField("b");
+
+			b.setAccessible(true);
+			b.set(metaPacket, watcher.c());
+		} catch(Exception e){
+			e.printStackTrace();
+		}
+
+		return metaPacket;
+	}
+
+	public static Packet205ClientCommand getRespawnPacket(){
+		Packet205ClientCommand packet = new Packet205ClientCommand();
+
+		packet.a = (int) 1;
+
+		return packet;
+	}
+
+	public static DataWatcher getWatcher(String text, int health){
+		DataWatcher watcher = new DataWatcher();
+
+		watcher.a(0, (Byte) (byte) 0x20); //Flags, 0x20 = invisible
+		watcher.a(6, (Float) (float) health);
+		watcher.a(10, (String) text); //Entity name
+		watcher.a(11, (Byte) (byte) 1); //Show name, 1 = show, 0 = don't show
+		//watcher.a(16, (Integer) (int) health); //Wither health, 300 = full health
+
+		return watcher;
+	}
+
+	//Other methods
+	public static void displayTextBar(String text, final Player player){
+		Packet24MobSpawn mobPacket = getMobPacket(text, player.getLocation());
+
+		sendPacket(player, mobPacket);
+		hasHealthBar.put(player.getName(), true);
+
+		new BukkitRunnable(){
+			@Override
+			public void run(){
+				Packet29DestroyEntity destroyEntityPacket = getDestroyEntityPacket();
+
+				sendPacket(player, destroyEntityPacket);
+				hasHealthBar.put(player.getName(), false);
+			}
+		}.runTaskLater(MinecraftFPS.getInstance(), 120L);
+	}
+
+	public static void displayLoadingBar(final String text, final String completeText, final Player player, final int healthAdd, final long delay, final boolean loadUp){
+		Packet24MobSpawn mobPacket = getMobPacket(text, player.getLocation());
+
+		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);
+					Packet40EntityMetadata metaPacket = getMetadataPacket(watcher);
+
+					sendPacket(player, metaPacket);
+
+					if(loadUp){
+						health += healthAdd;
+					} else {
+						health -= healthAdd;
+					}
+				} else {
+					DataWatcher watcher = getWatcher(text, (loadUp ? 300 : 0));
+					Packet40EntityMetadata metaPacket = getMetadataPacket(watcher);
+					Packet29DestroyEntity destroyEntityPacket = getDestroyEntityPacket();
+
+					sendPacket(player, metaPacket);					
+					sendPacket(player, destroyEntityPacket);
+					hasHealthBar.put(player.getName(), false);
+
+					//Complete text
+					Packet24MobSpawn mobPacket = getMobPacket(completeText, player.getLocation());
+
+					sendPacket(player, mobPacket);
+					hasHealthBar.put(player.getName(), true);
+
+					DataWatcher watcher2 = getWatcher(completeText, 300);
+					Packet40EntityMetadata metaPacket2 = getMetadataPacket(watcher2);
+
+					sendPacket(player, metaPacket2);
+
+					new BukkitRunnable(){
+						@Override
+						public void run(){
+							Packet29DestroyEntity destroyEntityPacket = getDestroyEntityPacket();
+
+							sendPacket(player, destroyEntityPacket);
+							hasHealthBar.put(player.getName(), false);
+						}
+					}.runTaskLater(MinecraftFPS.getInstance(), 40L);
+
+					this.cancel();
+				}
+			}
+		}.runTaskTimer(MinecraftFPS.getInstance(), 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);
+	}
+}