Ropes

Ropes.java

import net.minecraft.server.v1_7_R1.EntityBat;
import net.minecraft.server.v1_7_R1.EntityWitherSkull;
import net.minecraft.server.v1_7_R1.PacketPlayOutAttachEntity;
import net.minecraft.server.v1_7_R1.PacketPlayOutEntityDestroy;
import net.minecraft.server.v1_7_R1.PacketPlayOutSpawnEntity;
import net.minecraft.server.v1_7_R1.PacketPlayOutSpawnEntityLiving;
import net.minecraft.server.v1_7_R1.WorldServer;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.craftbukkit.v1_7_R1.CraftWorld;
import org.bukkit.craftbukkit.v1_7_R1.entity.CraftPlayer;
import org.bukkit.entity.Player;

/**
 * Credits to @Desile for the original resource. (Uses entities, not packets)
 *
 * @author Goblom
 */
public class Rope {
 
    private Location loc_start, loc_end;
    private EntityWitherSkull ent_start, ent_end;
    private EntityBat ent_bat_start, ent_bat_end;
 
    public Rope(Location start, Location end) {
        this(start, end, true);
    }
 
    public Rope(Location start, Location end, boolean spawn) {
        this.loc_start = start;
        this.loc_end = end;
        
        if (spawn) {
            spawn();
        }
    }
    
    public void setStart(Location start) {
        this.loc_start = start;
        spawn();
    }
 
    public void setEnd(Location end) {
        this.loc_end = end;
        spawn();
    }
 
    public Location getStart() {
        return loc_start;
    }
 
    public Location getEnd() {
        return loc_end;
    }
 
    private void makeEnt() {
        WorldServer world_start = ((CraftWorld) loc_start.getWorld()).getHandle();
        WorldServer world_end = ((CraftWorld) loc_end.getWorld()).getHandle();
 
        if (ent_start == null) {
            this.ent_start = new EntityWitherSkull(world_start);
        }
 
        if (ent_end == null) {
            this.ent_end = new EntityWitherSkull(world_end);
        }
 
        if (ent_bat_start == null) {
            this.ent_bat_start = new EntityBat(world_start);
        }
 
        if (ent_bat_end == null) {
            this.ent_bat_end = new EntityBat(world_end);
        }
        
        this.ent_start.setLocation(loc_start.getX(), loc_start.getY(), loc_start.getZ(), 0, 0);
        this.ent_end.setLocation(loc_end.getX(), loc_end.getY(), loc_end.getZ(), 0, 0);
        this.ent_bat_start.setLocation(loc_start.getX(), loc_start.getY(), loc_start.getZ(), 0, 0);
        this.ent_bat_end.setLocation(loc_end.getX(), loc_end.getY(), loc_end.getZ(), 0, 0);
        
        this.ent_bat_start.setLeashHolder(ent_bat_end, true); //Try with false
    }
 
    public void spawn() {
        makeEnt();
        PacketPlayOutSpawnEntity skull_start = new PacketPlayOutSpawnEntity(ent_start, 66);
        PacketPlayOutSpawnEntity skull_end = new PacketPlayOutSpawnEntity(ent_end, 66);
        PacketPlayOutSpawnEntityLiving bat_start = new PacketPlayOutSpawnEntityLiving(ent_bat_start);
        PacketPlayOutSpawnEntityLiving bat_end = new PacketPlayOutSpawnEntityLiving(ent_bat_start);
        PacketPlayOutAttachEntity attach_start = new PacketPlayOutAttachEntity(0, ent_start, ent_bat_start);
        PacketPlayOutAttachEntity attach_end = new PacketPlayOutAttachEntity(0, ent_end, ent_bat_end);
        
        for (Player player : Bukkit.getOnlinePlayers()) {
            spawn(player, skull_start, skull_end, bat_start, bat_end, attach_start, attach_end);
        }
    }
    
    protected void spawn(Player player, PacketPlayOutSpawnEntity skull_start, PacketPlayOutSpawnEntity skull_end, PacketPlayOutSpawnEntityLiving bat_start, PacketPlayOutSpawnEntityLiving bat_end, PacketPlayOutAttachEntity attach_start, PacketPlayOutAttachEntity attach_end) {
        CraftPlayer cP = (CraftPlayer) player;
        
        cP.getHandle().playerConnection.sendPacket(skull_start);
        cP.getHandle().playerConnection.sendPacket(skull_end);
        cP.getHandle().playerConnection.sendPacket(bat_end);
        cP.getHandle().playerConnection.sendPacket(bat_start);
        cP.getHandle().playerConnection.sendPacket(attach_start);
        cP.getHandle().playerConnection.sendPacket(attach_end);
    }
    
    public void spawn(Player player) {
        makeEnt();
        PacketPlayOutSpawnEntity skull_start = new PacketPlayOutSpawnEntity(ent_start, 66);
        PacketPlayOutSpawnEntity skull_end = new PacketPlayOutSpawnEntity(ent_end, 66);
        PacketPlayOutSpawnEntityLiving bat_start = new PacketPlayOutSpawnEntityLiving(ent_bat_start);
        PacketPlayOutSpawnEntityLiving bat_end = new PacketPlayOutSpawnEntityLiving(ent_bat_start);
        PacketPlayOutAttachEntity attach_start = new PacketPlayOutAttachEntity(0, ent_start, ent_bat_start);
        PacketPlayOutAttachEntity attach_end = new PacketPlayOutAttachEntity(0, ent_end, ent_bat_end);
        
        spawn(player, skull_start, skull_end, bat_start, bat_end, attach_start, attach_end);
    }
    
    public void deSpawn() {
        PacketPlayOutEntityDestroy destroy = new PacketPlayOutEntityDestroy(new int[] { ent_start.getId(), ent_end.getId(), ent_bat_start.getId(), ent_bat_end.getId() });
        
        for (Player player : Bukkit.getOnlinePlayers()) {
            deSpawn(player, destroy);
        }
    }
    
    public void deSpawn(Player player) {
        deSpawn(player, new PacketPlayOutEntityDestroy(new int[] { ent_start.getId(), ent_end.getId(), ent_bat_start.getId(), ent_bat_end.getId() }));
    }
    
    protected void deSpawn(Player player, PacketPlayOutEntityDestroy destroy) {
        CraftPlayer cP = (CraftPlayer) player;
        cP.getHandle().playerConnection.sendPacket(destroy);
    }
}