Add leave-buffer-distance to tolerate knockback at region edges

src/main/java/com/garbagemule/MobArena/ArenaImpl.java

@@ -134,6 +134,7 @@ public class ArenaImpl implements Arena
     private Map<Integer, ThingPicker> everyWaveMap, afterWaveMap, waveTiersMap;
     private double spawnpointMinDistanceSquared;
     private double spawnpointMaxDistanceSquared;
+    private int leaveBufferDistance;
 
     // Misc
     private ArenaListener eventListener;
@@ -220,6 +221,7 @@ public class ArenaImpl implements Arena
         this.waveTiersMap = MAUtils.getArenaRewardMap(plugin, section, name, "tiers");
         this.spawnpointMinDistanceSquared = Math.pow(settings.getDouble("spawnpoint-min-distance", 0), 2);
         this.spawnpointMaxDistanceSquared = Math.pow(settings.getDouble("spawnpoint-max-distance", 15), 2);
+        this.leaveBufferDistance = settings.getInt("leave-buffer-distance", 3);
 
         // Misc
         this.eventListener = new ArenaListener(this, plugin);
@@ -403,6 +405,11 @@ public class ArenaImpl implements Arena
         return spawnpointMaxDistanceSquared;
     }
 
+    @Override
+    public int getLeaveBufferDistance() {
+        return leaveBufferDistance;
+    }
+
     @Override
     public WaveManager getWaveManager() {
         return waveManager;

src/main/java/com/garbagemule/MobArena/MASpawnThread.java

@@ -345,7 +345,7 @@ public class MASpawnThread implements Runnable
     private void removeCheatingPlayers() {
         List<Player> players = new ArrayList<>(arena.getPlayersInArena());
         for (Player p : players) {
-            if (region.contains(p.getLocation())) {
+            if (region.contains(p.getLocation(), arena.getLeaveBufferDistance())) {
                 continue;
             }
 

src/main/java/com/garbagemule/MobArena/framework/Arena.java

@@ -86,6 +86,8 @@ public interface Arena
 
     double getSpawnpointMaxDistanceSquared();
 
+    int getLeaveBufferDistance();
+
     WaveManager getWaveManager();
 
     ArenaListener getEventListener();

src/main/resources/res/settings.yml

@@ -29,6 +29,7 @@ wave-interval: 15
 final-wave: 0
 spawnpoint-min-distance: 0
 spawnpoint-max-distance: 15
+leave-buffer-distance: 3
 monster-limit: 100
 monster-exp: false
 keep-exp: false