Create SpecentrePlugin.java

source/molor/plugin/specentre/SpecentrePlugin.java

@@ -0,0 +1,62 @@
+package molor.plugin.specentre;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.java.JavaPlugin;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.events.ListenerPriority;
+import com.comphenix.protocol.events.PacketAdapter;
+import com.comphenix.protocol.events.PacketContainer;
+import com.comphenix.protocol.events.PacketEvent;
+
+public class SpecentrePlugin extends JavaPlugin {
+	@Override
+	public void onEnable() {
+		ProtocolLibrary.getProtocolManager().addPacketListener(new PacketAdapter(this, ListenerPriority.MONITOR, PacketType.Play.Server.VIEW_CENTRE) {
+			@Override
+			public void onPacketSending(PacketEvent theEvent) {
+				if (theEvent.isCancelled())
+					return;
+
+				Player thePlayer =
+					theEvent.getPlayer();
+				Entity theView =
+					thePlayer.getSpectatorTarget();
+
+				// See:
+				// https://bugs.mojang.com/browse/MC-148993
+
+				if (theView == null)
+					return; // not a spectator or didn't grab camera of other entity
+
+				Location toLocation =
+					theView.getLocation();
+				PacketContainer thePacket =
+					new PacketContainer(PacketType.Play.Server.ENTITY_TELEPORT);
+
+				thePacket.getIntegers().write(0, thePlayer.getEntityId());
+				thePacket.getDoubles().write(0, toLocation.getX());
+				thePacket.getDoubles().write(1, toLocation.getY());
+				thePacket.getDoubles().write(2, toLocation.getZ());
+				thePacket.getBytes().write(0, (byte) toLocation.getYaw());
+				thePacket.getBytes().write(1, (byte) toLocation.getPitch());
+				thePacket.getBooleans().write(0, false);
+
+				try {
+					ProtocolLibrary.getProtocolManager().sendServerPacket(thePlayer, thePacket);
+				}
+				catch (Exception theException) {
+					theException.printStackTrace();
+				}
+			}
+		});
+	}
+
+	@Override
+	public void onDisable() {
+		ProtocolLibrary.getProtocolManager().removePacketListeners(this);
+	}
+}