Add behaviour system

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Assets/Scripts/AI.meta

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Assets/Scripts/AI/AIBehaviour.cs

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+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI {
+    public abstract class Behaviour : MonoBehaviour {
+        /* Returns whether or not Exectute() should be called this frame */
+        public abstract bool CanBehave(Enemy subject);
+        /* Returns whether or not this was a blocking behaviour, ie. should the behaviour processing be stopped here */
+        public abstract bool Execute(Enemy subject);
+    }
+}

Assets/Scripts/AI/AIBehaviour.cs.meta

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Assets/Scripts/AI/BehaviourBranch.cs

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+using System;
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI {
+    [Serializable]
+    public class BehaviourBranch : BehaviourNode {
+        public Trigger Trigger;
+        public BehaviourNode[] TriggeredNodes;
+        public BehaviourNode[] NotTriggeredNodes;
+
+        /* Returns true if any action was taken. */
+        public override bool Execute(Enemy subject) {
+            if (Trigger.IsTriggered(subject)) {
+                foreach (BehaviourNode Node in TriggeredNodes) {
+                    if (Node.Execute(subject)) {
+                        return true;
+                    }
+                }
+            } else {
+                foreach (BehaviourNode Node in NotTriggeredNodes) {
+                    if (Node.Execute(subject)) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        }
+    }
+}

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Assets/Scripts/AI/BehaviourLeaf.cs

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+using System;
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI {
+    [Serializable]
+    public class BehaviourLeaf : BehaviourNode {
+        public Behaviour[] Behaviours;
+        public bool IsLeaf { get { return Behaviours.Length > 0; } }
+
+        /* Returns true if any action was taken. */
+        public override bool Execute(Enemy subject) {
+            bool Acted = false;
+            foreach (Behaviour Behaviour in Behaviours) {
+                if (Behaviour.CanBehave(subject)) {
+                    if (Behaviour.Execute(subject)) {
+                        return true;
+                    } else {
+                        Acted = true;
+                    }
+                }
+            }
+            return Acted;
+        }
+    }
+}

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Assets/Scripts/AI/BehaviourNode.cs

@@ -0,0 +1,10 @@
+using System;
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI {
+    [Serializable]
+    public abstract class BehaviourNode : MonoBehaviour {
+        /* Returns true if any action was taken. */
+        public abstract bool Execute(Enemy subject);
+    }
+}

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Assets/Scripts/AI/Behaviours/Follow.cs

@@ -0,0 +1,28 @@
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI.Behaviours {
+    public class Follow : Behaviour {
+        public Transform Target;
+        public float CloseEnoughRadius;
+
+        public override bool CanBehave(Enemy subject) {
+            return true;
+        }
+
+        public override bool Execute(Enemy subject) {
+            if (Target != null) {
+                Vector2 position = subject.transform.position;
+                Vector2 targetPosition = Target.position;
+                Vector2 delta = targetPosition - position;
+                if (delta.magnitude > CloseEnoughRadius) {
+                    delta -= delta.normalized * CloseEnoughRadius;
+                    subject.StartMovingTo(position + delta);
+                    return true;
+                }
+            }
+
+            subject.StopMoving();
+            return false;
+        }
+    }
+}

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Assets/Scripts/AI/Trigger.cs

@@ -0,0 +1,7 @@
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI {
+    public abstract class Trigger : MonoBehaviour {
+        public abstract bool IsTriggered(Enemy subject);
+    }
+}

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Assets/Scripts/AI/Triggers/EnemySighted.cs

@@ -0,0 +1,24 @@
+using UnityEngine;
+
+namespace Saltosion.OneWeapon.AI.Triggers {
+    public class EnemySighted : Trigger {
+        public float Radius;
+        public Enemy ClosestEnemy { get; private set; }
+
+        public override bool IsTriggered(Enemy subject) {
+            Collider2D[] NearbyEnemies = Physics2D.OverlapCircleAll(subject.transform.position, Radius);
+            float LowestDistance = float.PositiveInfinity;
+            bool FoundEnemy = false;
+            foreach (Collider2D Enemy in NearbyEnemies) {
+                float Distance = (Enemy.transform.position - subject.transform.position).magnitude;
+                Enemy EnemyComponent = Enemy.GetComponent<Enemy>();
+                if (EnemyComponent != null && Distance < LowestDistance && Enemy.gameObject != gameObject) {
+                    LowestDistance = Distance;
+                    ClosestEnemy = EnemyComponent;
+                    FoundEnemy = true;
+                }
+            }
+            return FoundEnemy;
+        }
+    }
+}

Assets/Scripts/AI/Triggers/EnemySighted.cs.meta

@@ -0,0 +1,11 @@
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+guid: 48c46784c52bdad4db2a4382d9c46843
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Assets/Scripts/Enemy.cs

@@ -0,0 +1,37 @@
+using UnityEngine;
+using Saltosion.OneWeapon.AI;
+
+namespace Saltosion.OneWeapon {
+    [RequireComponent(typeof(Rigidbody2D))]
+    public class Enemy : MonoBehaviour {
+        public float MoveSpeed;
+        public BehaviourNode BehaviourTree;
+
+        private Rigidbody2D Body;
+        private bool MovingToTarget = false;
+        private Vector2 TargetPosition;
+
+        private void Start() {
+            Body = GetComponent<Rigidbody2D>();
+        }
+
+        private void Update() {
+            BehaviourTree.Execute(this);
+        }
+
+        private void FixedUpdate() {
+            if (MovingToTarget) {
+                Body.velocity = (TargetPosition - Body.position).normalized * MoveSpeed;
+            }
+        }
+
+        public void StartMovingTo(Vector2 target) {
+            TargetPosition = target;
+            MovingToTarget = true;
+        }
+
+        public void StopMoving() {
+            MovingToTarget = false;
+        }
+    }
+}

Assets/Scripts/Enemy.cs.meta

@@ -0,0 +1,11 @@
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+guid: 978bec54408eb8f42a36fd68d7447f5a
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Assets/Scripts/EnemyFollower.cs

@@ -0,0 +1,18 @@
+using UnityEngine;
+using Saltosion.OneWeapon.AI;
+
+namespace Saltosion.OneWeapon {
+    [RequireComponent(typeof(AI.Behaviours.Follow), typeof(AI.Triggers.EnemySighted))]
+    public class EnemyFollower : MonoBehaviour {
+        public AI.Behaviours.Follow Follow;
+        public AI.Triggers.EnemySighted EnemySighted;
+
+        private void Update() {
+            if (EnemySighted.ClosestEnemy == null) {
+                Follow.Target = null;
+            } else {
+                Follow.Target = EnemySighted.ClosestEnemy.transform;
+            }
+        }
+    }
+}

Assets/Scripts/EnemyFollower.cs.meta

@@ -0,0 +1,11 @@
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Assets/Sounds.meta

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ProjectSettings/Physics2DSettings.asset

@@ -4,7 +4,7 @@
 Physics2DSettings:
   m_ObjectHideFlags: 0
   serializedVersion: 4
-  m_Gravity: {x: 0, y: -9.81}
+  m_Gravity: {x: 0, y: 0}
   m_DefaultMaterial: {fileID: 0}
   m_VelocityIterations: 8
   m_PositionIterations: 3