Created teleportation method for V1_12_R1.

src/net/jitse/npclib/api/NPC.java

@@ -162,4 +162,13 @@ public abstract class NPC {
 
     // Internal method.
     protected abstract void sendHidePackets(Player player);
+
+    public void teleport(Player player, Location location) {
+        this.location = location;
+
+        sendTeleportationPackets(player);
+    }
+
+    // Internal method.
+    public abstract void sendTeleportationPackets(Player player);
 }

src/net/jitse/npclib/nms/v1_12_R1/NPC_V1_12_R1.java

@@ -6,10 +6,7 @@ package net.jitse.npclib.nms.v1_12_R1;
 
 import net.jitse.npclib.api.NPC;
 import net.jitse.npclib.nms.holograms.Hologram;
-import net.jitse.npclib.nms.v1_12_R1.packets.PacketPlayOutEntityHeadRotationWrapper;
+import net.jitse.npclib.nms.v1_12_R1.packets.*;
-import net.jitse.npclib.nms.v1_12_R1.packets.PacketPlayOutNamedEntitySpawnWrapper;
-import net.jitse.npclib.nms.v1_12_R1.packets.PacketPlayOutPlayerInfoWrapper;
-import net.jitse.npclib.nms.v1_12_R1.packets.PacketPlayOutScoreboardTeamWrapper;
 import net.jitse.npclib.skin.Skin;
 import net.minecraft.server.v1_12_R1.*;
 import org.bukkit.Bukkit;
@@ -100,4 +97,13 @@ public class NPC_V1_12_R1 extends NPC {
         Bukkit.getScheduler().runTaskLater(plugin, () ->
                 playerConnection.sendPacket(packetPlayOutScoreboardTeamUnregister), 5);
     }
+
+    @Override
+    public void sendTeleportationPackets(Player player) {
+        PlayerConnection playerConnection = ((CraftPlayer) player).getHandle().playerConnection;
+
+        PacketPlayOutEntityTeleport packetPlayOutEntityTeleport = new PacketPlayOutEntityTeleportWrapper().create(entityId, location);
+
+        playerConnection.sendPacket(packetPlayOutEntityTeleport);
+    }
 }

src/net/jitse/npclib/nms/v1_12_R1/packets/PacketPlayOutEntityTeleportWrapper.java

@@ -4,10 +4,35 @@
 
 package net.jitse.npclib.nms.v1_12_R1.packets;
 
+import com.comphenix.tinyprotocol.Reflection;
+import net.minecraft.server.v1_12_R1.PacketPlayOutEntityTeleport;
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.block.BlockFace;
+
 /**
  * @author Jitse Boonstra
  */
 public class PacketPlayOutEntityTeleportWrapper {
 
+    public PacketPlayOutEntityTeleport create(int entityId, Location location) {
+        PacketPlayOutEntityTeleport packetPlayOutEntityTeleport = new PacketPlayOutEntityTeleport();
 
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "a", int.class)
+                .set(packetPlayOutEntityTeleport, entityId);
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "b", double.class)
+                .set(packetPlayOutEntityTeleport, location.getX());
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "c", double.class)
+                .set(packetPlayOutEntityTeleport, location.getY());
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "d", double.class)
+                .set(packetPlayOutEntityTeleport, location.getZ());
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "e", byte.class)
+                .set(packetPlayOutEntityTeleport, (byte) ((int) (location.getYaw() * 256.0F / 360.0F)));
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "f", byte.class)
+                .set(packetPlayOutEntityTeleport, (byte) ((int) (location.getPitch() * 256.0F / 360.0F)));
+        Reflection.getField(packetPlayOutEntityTeleport.getClass(), "g", boolean.class)
+                .set(packetPlayOutEntityTeleport, location.getBlock().getRelative(BlockFace.DOWN).getType() != Material.AIR);
+
+        return packetPlayOutEntityTeleport;
+    }
 }