CheckBorder.java

package net.unique.worldborder;

import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerMoveEvent;
import org.bukkit.util.Vector;

public class CheckBorder implements Listener {
    @EventHandler
    public void checkIsPlayerNearBorder(PlayerMoveEvent e) {
        Player p = e.getPlayer();
        Location l = p.getLocation();
        FileConfiguration config = Main.getInst().getConfig();
        Main plugin = Main.getInst();
        if (config.get("worlds."+l.getWorld())+".middlepoint.w" != null) {
            Location middlepoint = new Location(
                    Bukkit.getWorld(config.getString("worlds."+l.getWorld().getName()+".middle.w")),
                    config.getDouble("worlds"+l.getWorld().getName()+".middle.x"),
                    config.getDouble("worlds"+l.getWorld().getName()+".middle.y"),
                    config.getDouble("worlds"+l.getWorld().getName()+".middle.z"));
            if (p.getLocation().distance(middlepoint) == config.getDouble("worlds"+l.getWorld().getName()+".radius")) {
                String direction = Utils.getCardinalDirection(p);
                Utils.clearBlocks(l, direction);
                switch (direction) {
                case "N":
                    new Location(l.getWorld(), l.getX(), l.getY(), l.getZ() - 1).getBlock().setType(Material.GLASS);
                    break;
                case "E":
                    new Location(l.getWorld(), l.getX() + 1, l.getY(), l.getZ()).getBlock().setType(Material.GLASS);
                    break;
                case "S":
                    new Location(l.getWorld(), l.getX(), l.getY(), l.getZ() + 1).getBlock().setType(Material.GLASS);
                    break;
                case "W":
                    new Location(l.getWorld(), l.getX() - 1, l.getY(), l.getZ()).getBlock().setType(Material.GLASS);
                    break;
                }
            } else if (p.getLocation().distance(middlepoint) < config.getDouble("worlds"+l.getWorld().getName()+".radius")) {
                String direction = Utils.getCardinalDirection(p);
                Utils.clearBlocks(l, direction);
                Vector vector = new Vector(0, 0, 0);
                switch (direction) {
                case "N":
                    // -Z
                    vector = new Vector(0, 1, -1);
                    break;
                case "E":
                    // +X
                    vector = new Vector(1, 1, 0);
                    break;
                case "S":
                    // +Z
                    vector = new Vector(0, 1, 1);
                    break;
                case "W":
                    // -X
                    vector = new Vector(-1, 1, 0);
                    break;
                }
                p.setVelocity(vector);
            }
        }
    }
}