From eccd25d02960b9d8013f87af280f806dfa1c0aa8 Mon Sep 17 00:00:00 2001
From: Steve Streeting <steve@stevestreeting.com>
Date: Thu, 15 Dec 2016 17:47:06 +0000
Subject: [PATCH 1/2] Add OnNeighborsChanged event to SteerForNeighborGroup2D

This is useful for adjusting other behaviours when neighbors change
---
 2D/Behaviors/SteerForNeighborGroup2D.cs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/2D/Behaviors/SteerForNeighborGroup2D.cs b/2D/Behaviors/SteerForNeighborGroup2D.cs
index a23f66c..96a1658 100644
--- a/2D/Behaviors/SteerForNeighborGroup2D.cs
+++ b/2D/Behaviors/SteerForNeighborGroup2D.cs
@@ -1,5 +1,7 @@
+using System;
 using System.Collections.Generic;
 using UnityEngine;
+using UnityEngine.Profiling;
 using UnitySteer.Attributes;
 
 namespace UnitySteer2D.Behaviors
@@ -116,6 +118,12 @@ public List<Vehicle2D> Neighbors
             get { return _neighbors; }
         }
 
+        /// <summary>
+        /// Delegate which is called when the detected neighbors list is changed
+        /// </summary>
+        public Action<SteerForNeighborGroup2D> OnNeighborsChanged = delegate { };
+
+
         #endregion
 
         #region Methods
@@ -162,6 +170,14 @@ private void HandleDetection(Radar2D radar)
                     _neighbors.Add(other);
                 }
             }
+
+            if (OnNeighborsChanged != null)
+            {
+                Profiler.BeginSample("Neighbor event handler");
+                OnNeighborsChanged(this);
+                Profiler.EndSample();
+            }
+
         }
 
         protected override Vector2 CalculateForce()

From d014aecb1e5fed53b81a0e222d3f07a7ea555afb Mon Sep 17 00:00:00 2001
From: Steve Streeting <steve@stevestreeting.com>
Date: Wed, 21 Dec 2016 09:38:41 +0000
Subject: [PATCH 2/2] Updated Changelog

---
 CHANGELOG.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2de3ef5..a7323d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # UnitySteer changelog
 
+## WIP
+
+* Added OnNeighborsChanged event to SteerForNeighbourGroup2D
+
 ## v3.1
 
 * 2D support thanks to @GandaG and @pjohalloran.