引入危险警告服务

src/main/java/ling/coordinateRecorder/CoordinateRecorder.java

@@ -2,6 +2,7 @@ package ling.coordinateRecorder;
 
 import ling.coordinateRecorder.Commands.ZbCommand;
 import ling.coordinateRecorder.Listener.*;
+import ling.coordinateRecorder.Service.DangerWarningService;
 import ling.coordinateRecorder.Service.ItemShowService;
 import ling.coordinateRecorder.Service.ServiceManager;
 import ling.coordinateRecorder.Service.TransmitService;
@@ -19,6 +20,7 @@ public final class CoordinateRecorder extends JavaPlugin {
     private static Plugin authMePlugin;
     private static TransmitService transmitService;
     private static ItemShowService itemShowService;
+    private static DangerWarningService dangerWarningService;
     
     private static void start() throws SQLException {
         database.installPlugin();
@@ -54,6 +56,8 @@ public final class CoordinateRecorder extends JavaPlugin {
             command.setTabCompleter(zb);
             transmitService = (TransmitService) ServiceManager.getCurrent().startService(TransmitService.class, 4L);
             itemShowService = (ItemShowService) ServiceManager.getCurrent().startService(ItemShowService.class, 200L);
+            dangerWarningService =
+                    (DangerWarningService) ServiceManager.getCurrent().startService(DangerWarningService.class, 10L);
             getLogger().info("加载完毕");
         } catch (SQLException e) {
             throw new RuntimeException("插件初始化失败", e);
@@ -70,6 +74,10 @@ public final class CoordinateRecorder extends JavaPlugin {
         return transmitService;
     }
     
+    public static DangerWarningService getDangerWarningService() {
+        return dangerWarningService;
+    }
+    
     @Override
     public void onDisable() {
         // Plugin shutdown logic

src/main/java/ling/coordinateRecorder/Listener/PlayerMap.java

@@ -2,6 +2,7 @@ package ling.coordinateRecorder.Listener;
 
 import ling.coordinateRecorder.Config;
 import ling.coordinateRecorder.CoordinateRecorder;
+import ling.coordinateRecorder.data.Entity.TraverseLoginPlayerInterface;
 import ling.coordinateRecorder.data.PlayerData;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
@@ -106,4 +107,10 @@ public class PlayerMap {
         if (data != null)
             data.updateLocal();
     }
+    
+    public void traversePlayer(TraverseLoginPlayerInterface on) {
+        for (Map.Entry<UUID, PlayerData> entry : this.playerList.entrySet()) {
+            on.onLoginPlayer(entry.getValue());
+        }
+    }
 }

src/main/java/ling/coordinateRecorder/Service/DangerWarningService.java

@@ -0,0 +1,69 @@
+package ling.coordinateRecorder.Service;
+
+import ling.coordinateRecorder.Listener.PlayerMap;
+import ling.coordinateRecorder.data.Entity.TraverseLoginPlayerInterface;
+import ling.coordinateRecorder.data.PlayerData;
+import net.md_5.bungee.api.ChatColor;
+import net.md_5.bungee.api.ChatMessageType;
+import net.md_5.bungee.api.chat.BaseComponent;
+import net.md_5.bungee.api.chat.TextComponent;
+import net.md_5.bungee.api.chat.TranslatableComponent;
+import org.bukkit.Location;
+import org.bukkit.entity.Creeper;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.util.Vector;
+
+///     危险警告服务
+public class DangerWarningService implements Service, TraverseLoginPlayerInterface {
+    private static final BaseComponent WARNING_MESSAGE;
+    
+    static {
+        WARNING_MESSAGE = new TextComponent();
+        BaseComponent warning = new TextComponent("[危险警告]");
+        warning.setColor(ChatColor.YELLOW);
+        warning.setBold(true);
+        warning.setUnderlined(true);
+        TranslatableComponent name = new TranslatableComponent(
+                "entity.minecraft." + EntityType.CREEPER.name().toLowerCase());
+        name.setBold(true);
+        WARNING_MESSAGE.addExtra(warning);
+        WARNING_MESSAGE.addExtra(" ");
+        WARNING_MESSAGE.addExtra(name);
+        WARNING_MESSAGE.addExtra(" ");
+        WARNING_MESSAGE.addExtra("正在你的背后！");
+    }
+    
+    @Override
+    public void start() {
+        PlayerMap.getCurrent().traversePlayer(this);
+    }
+    
+    @Override
+    public void onLoginPlayer(PlayerData data) {
+        Player player = data.getPlayer();
+        Location location = player.getLocation();
+        Vector direction = location.getDirection();
+        //玩家背后
+        Location backLocation = location.clone().add(direction.multiply(-11));
+        backLocation.setY(location.getY());
+        
+        // 搜索背后 20 格范围内的实体
+        double detectionRadius = 10.0;
+        for (Entity entity : player.getWorld().getNearbyEntities(backLocation, detectionRadius, detectionRadius,
+                                                                 detectionRadius)) {
+            if (entity instanceof Creeper) {
+                BaseComponent message = new TextComponent(WARNING_MESSAGE);
+                BaseComponent distance =
+                        new TextComponent(String.valueOf((int) location.distance(entity.getLocation())));
+                distance.setColor(ChatColor.YELLOW);
+                message.addExtra("距离你");
+                message.addExtra(distance);
+                message.addExtra("M");
+                player.spigot().sendMessage(ChatMessageType.ACTION_BAR, message);
+                break;
+            }
+        }
+    }
+}