Simplify rule application and add in enable/disable rules

Boids/Assets/Scenes/SampleScene.unity

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Boids/Assets/Scenes/SampleScene.unity.meta

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Boids/Assets/Scripts/Boid.cs

@@ -47,21 +47,20 @@ public class Boid : MonoBehaviour {
             _latestNeighborhoodCount = flock.Count;
 
             // Calculate all offsets and multiple by magnitudes given
-            Vector2 r1, r2, r3, r4;
-            r4 = _parent.Boundary.Contains(_position) ? Vector2.zero : RuleBound() * _parent.boundaryBias;
-
             if (flock.Count > 0) {
-                r1 = Rule1(flock) * _parent.cohesionBias;
-                r2 = Rule2(flock) * _parent.separationBias;
-                r3 = Rule3(flock) * _parent.alignmentBias;
-                _velocity += r1 + r2 + r3 + r4;
-            }
-            else {
-                _velocity += r4;
+                if (_parent.enableCohesion)
+                    _velocity += Rule1(flock) * _parent.cohesionBias;
+                if (_parent.enableSeparation)
+                    _velocity += Rule2(flock) * _parent.separationBias;
+                if (_parent.enableAlignment)
+                    _velocity += Rule3(flock) * _parent.alignmentBias;
             }
 
+            if(_parent.enableBoundary && _parent.Boundary.Contains(_position))
+                _velocity += RuleBound() * _parent.boundaryBias;
+
             // Limit the Velocity Vector to a certain Magnitude
-            _velocity = Util.LimitVelocity(_velocity, _parent.boidVelocityLimit);
+            _velocity = Util.MaxVelocity(_velocity, _parent.boidVelocityLimit);
 
             _position += _velocity;
             transform.position = new Vector3(_position.x, _position.y, 0);
@@ -103,7 +102,7 @@ public class Boid : MonoBehaviour {
     private void UpdateCenteringVelocity() {
         _centeringVelocity = Util.RotateBy(new Vector2(_parent.boidVelocityLimit, _parent.boidVelocityLimit),
             Vector2.Angle(_position, _parent.Space.center));
-        _centeringVelocity = Util.LimitVelocity(_parent.Space.center - _position, _parent.boidVelocityLimit / 2.0f);
+        _centeringVelocity = Util.MaxVelocity(_parent.Space.center - _position, _parent.boidVelocityLimit / 2.0f);
     }
 
     // Returns a velocity (Vector2) at a random angle with a specific overall magnitude

Boids/Assets/Scripts/BoidController.cs

@@ -23,7 +23,7 @@ public class BoidController : MonoBehaviour {
     [SerializeField] public float cohesionBias = 0.05f;
     [SerializeField] public float boundaryBias = 1f;
 
-    // Enable/Disable Boid Rules
+    // Enable/Disable Boid Rules Altogether
     [SerializeField] public bool enableSeparation = true;
     [SerializeField] public bool enableAlignment = true;
     [SerializeField] public bool enableCohesion = true;

Boids/Assets/Scripts/BoidControllerEditor.cs

@@ -1,4 +1,5 @@
-using UnityEditor;
+#if UNITY_EDITOR
+using UnityEditor;
 using UnityEngine;
 
 [CustomEditor(typeof(BoidController))]
@@ -43,4 +44,5 @@ public class BoidControllerEditor : Editor {
         controller.circleVertexCount = EditorGUILayout.IntSlider("Circle Vertex Count", controller.circleVertexCount, 4, 360);
         controller.circleWidth = EditorGUILayout.Slider("Circle Line Width", controller.circleWidth, 0.01f, 1f);
     }
-}
+}
+#endif

Boids/Assets/Scripts/Util.cs

@@ -9,11 +9,15 @@ public class Util {
         return new Vector2((float) rx, (float) (v.x * sa + v.y * ca));
     }
 
-    public static Vector2 LimitVelocity(Vector2 v, float max) {
-        if (v.magnitude > max) {
+    public static Vector2 MaxVelocity(Vector2 v, float max) {
+        if (v.sqrMagnitude > max * max)
             v = (v / v.magnitude) * max;
-        }
+        return v;
+    }
 
+    public static Vector2 MinVelocity(Vector2 v, float min) {
+        if (v.sqrMagnitude > min * min)
+            v = (v / v.magnitude) * min;
         return v;
     }