Simple Grappling Hook Spigot Plugin

SimpleGrapplingHook.java

// SPDX-License-Identifier: CC0

package io.github.twosquirrels.simplegrapplinghook;

import org.bukkit.ChatColor;
import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.FishHook;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerFishEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.Vector;

public final class SimpleGrapplingHook extends JavaPlugin implements Listener {

    final double LATERAL = 0.7;
    final double VERTICAL = 1.2;

    @Override
    public void onEnable() {
        // Plugin startup logic
        super.getServer().getPluginManager().registerEvents(this, this);
    }

    @Override
    public void onDisable() {
        // Plugin shutdown logic
    }

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        return true;
    }

    @EventHandler
    public void onFish(PlayerFishEvent event) {
        Player player = event.getPlayer();
        FishHook fishHook = event.getHook();
        PlayerFishEvent.State state = event.getState();
        if (
                state.equals(PlayerFishEvent.State.REEL_IN) ||
                        state.equals(PlayerFishEvent.State.IN_GROUND) ||
                        state.equals(PlayerFishEvent.State.CAUGHT_ENTITY) ||
                        state.equals(PlayerFishEvent.State.CAUGHT_FISH)
        ) {
            Location playerLoc = player.getLocation();
            Location hookLoc = fishHook.getLocation();
            double dir = Math.atan2(hookLoc.getZ() - playerLoc.getZ(), hookLoc.getX() - playerLoc.getX());
            player.setVelocity(new Vector()
                    .setX((hookLoc.getX() - playerLoc.getX()) * this.LATERAL)
                    .setY(this.VERTICAL)
                    .setZ((hookLoc.getZ() - playerLoc.getZ()) * this.LATERAL)
            );
        }
    }

}