Help with magic carpet plugin

so i am working on a magic carpet plugin so when u walk it always has a 3X3 area of glass under you but when you go forward it removes it behind you
the code:

Code:java

package com.trey2k.lightning;
 
import org.bukkit.Bukkit;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Main extends JavaPlugin implements Listener {
 
boolean ison = false;
public void onEnable(){
Bukkit.getServer().getPluginManager().registerEvents(this, this);
}
 
@EventHandler
public void onWalk(PlayerMoveEvent e){
if(ison==false){
return;
}else{
Block tp = e.getPlayer().getLocation().add(0, -1, 0).getBlock();
Block tp1 = e.getPlayer().getLocation().add(0, -1, -1).getBlock();
Block tp2 = e.getPlayer().getLocation().add(0, -1, +1).getBlock();
Block tp3 = e.getPlayer().getLocation().add(-1, -1, 0).getBlock();
Block tp4 = e.getPlayer().getLocation().add(+1, -1, 0).getBlock();
Block tp5 = e.getPlayer().getLocation().add(-1, -1, -1).getBlock();
Block tp6 = e.getPlayer().getLocation().add(-1, -1, +1).getBlock();
Block tp7 = e.getPlayer().getLocation().add(+1, -1, -1).getBlock();
Block tp8 = e.getPlayer().getLocation().add(+1, -1, +1).getBlock();
Block behind = e.getPlayer().getLocation().add(0, -1, +2).getBlock();
Block behind1 = e.getPlayer().getLocation().add(-1, -1, +2).getBlock();
Block behind2 = e.getPlayer().getLocation().add(+1, -1, +2).getBlock();
Block behind3 = e.getPlayer().getLocation().add(+1, -1, -2).getBlock();
Block behind4 = e.getPlayer().getLocation().add(+1, -1, -2).getBlock();
Block behind5 = e.getPlayer().getLocation().add(+2, -1, 0).getBlock();
Block behind6 = e.getPlayer().getLocation().add(+2, -1, +1).getBlock();
Block behind7 = e.getPlayer().getLocation().add(+2, -1, -1).getBlock();
Block behind8 = e.getPlayer().getLocation().add(-2, -1, +1).getBlock();
Block behind9 = e.getPlayer().getLocation().add(-2, -1, 0).getBlock();
Block behind10 = e.getPlayer().getLocation().add(0, -1, -2).getBlock();
Block behind11 = e.getPlayer().getLocation().add(+1, -1, -2).getBlock();
if(!e.getPlayer().isSneaking()){
tp.setType(Material.GLASS);
tp1.setType(Material.GLASS);
tp2.setType(Material.GLASS);
tp3.setType(Material.GLASS);
tp4.setType(Material.GLASS);
tp5.setType(Material.GLASS);
tp6.setType(Material.GLASS);
tp7.setType(Material.GLASS);
tp8.setType(Material.GLASS);
behind.setType(Material.AIR);
behind1.setType(Material.AIR);
behind2.setType(Material.AIR);
behind3.setType(Material.AIR);
behind4.setType(Material.AIR);
behind5.setType(Material.AIR);
behind6.setType(Material.AIR);
behind7.setType(Material.AIR);
behind8.setType(Material.AIR);
behind9.setType(Material.AIR);
behind10.setType(Material.AIR);
behind11.setType(Material.AIR);
}else{
return;
}
}
}
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){
if(cmd.getName().equalsIgnoreCase("Carpet")) {
Player player = (Player) sender;
if(player.hasPermission("Carpet.toggle")){
if(args.length==0){
if(ison==true){
ison=false;
player.sendMessage(ChatColor.GREEN + "Carpet: " + ChatColor.GRAY + "Was Turned off!");
}else{
ison=true;
player.sendMessage(ChatColor.GREEN + "Carpet: " + ChatColor.GRAY + "Was Turned on!");
}
}else if(args.length==1){
if(args[0].equalsIgnoreCase("on")){
ison=true;
player.sendMessage(ChatColor.GREEN + "Carpet: " + ChatColor.GRAY + "Was Turned on!");
}else if(args[0].equalsIgnoreCase("off")){
ison=false;
player.sendMessage(ChatColor.GREEN + "Carpet: " + ChatColor.GRAY + "Was Turned off!");
 
}else{
player.sendMessage(ChatColor.GREEN + "Usage: " + ChatColor.GRAY + "/Carpet <on/off>");
}
}else if(args.length>1){
player.sendMessage(ChatColor.GREEN + "Usage: " + ChatColor.GRAY + "/Carpet <on/off>");
}
}
}
return false;
}
}

but the problem is it leaves a trail of glass when u walk a certain way:

 

Trey2k
From a glance I think you are missing one of the variables. You don't have 0,-1,0 that you are setting to air, but at line 27 you set it to glass.

 

what i do is i only remove one line and thats the lines all around it so when u walk forward the on line that would still be there get removed

 

Use a Block ArrayList, add new ones, remove the last ones.