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Assets/Prefabs/Characters/Enemy/Goblin.prefab

@@ -87,7 +87,7 @@ Transform:
   m_PrefabInternal: {fileID: 100100000}
   m_GameObject: {fileID: 1225288737757304}
   m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
-  m_LocalPosition: {x: -0.234, y: 0.621, z: 0}
+  m_LocalPosition: {x: -0.142, y: 0.626, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children:
   - {fileID: 4140258981397796}
@@ -115,7 +115,7 @@ Transform:
   m_PrefabInternal: {fileID: 100100000}
   m_GameObject: {fileID: 1734061800721222}
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalPosition: {x: 0.133, y: 0.009, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children: []
   m_Father: {fileID: 4015301101001556}
@@ -128,7 +128,7 @@ Transform:
   m_PrefabInternal: {fileID: 100100000}
   m_GameObject: {fileID: 1636491341446076}
   m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
-  m_LocalPosition: {x: 6.01, y: 2.009, z: 0}
+  m_LocalPosition: {x: 0.862, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children:
   - {fileID: 4015301101001556}
@@ -167,7 +167,7 @@ BoxCollider2D:
   m_IsTrigger: 1
   m_UsedByEffector: 0
   m_UsedByComposite: 0
-  m_Offset: {x: 0.2218492, y: -0.06722689}
+  m_Offset: {x: 0, y: -0.079675555}
   m_SpriteTilingProperty:
     border: {x: 0, y: 0, z: 0, w: 0}
     pivot: {x: 0, y: 0}
@@ -178,7 +178,7 @@ BoxCollider2D:
     adaptiveTiling: 0
   m_AutoTiling: 0
   serializedVersion: 2
-  m_Size: {x: 0.17983007, y: 1.1344538}
+  m_Size: {x: 0.19960898, y: 1.1095564}
   m_EdgeRadius: 0
 --- !u!61 &61254635014177320
 BoxCollider2D:
@@ -192,7 +192,7 @@ BoxCollider2D:
   m_IsTrigger: 0
   m_UsedByEffector: 0
   m_UsedByComposite: 0
-  m_Offset: {x: -0.001632452, y: 0.5538476}
+  m_Offset: {x: 0, y: 0.5554246}
   m_SpriteTilingProperty:
     border: {x: 0, y: 0, z: 0, w: 0}
     pivot: {x: 0, y: 0}
@@ -203,7 +203,7 @@ BoxCollider2D:
     adaptiveTiling: 0
   m_AutoTiling: 0
   serializedVersion: 2
-  m_Size: {x: 0.5742383, y: 1.126192}
+  m_Size: {x: 0.7505637, y: 1.109323}
   m_EdgeRadius: 0
 --- !u!61 &61362187134790794
 BoxCollider2D:
@@ -267,8 +267,6 @@ MonoBehaviour:
   attackRange: 1
   patrolSpeed: 1.5
   trackSpeed: 2.5
-  playerDistance: 0
-  untouchable: 0
 --- !u!114 &114173716467154830
 MonoBehaviour:
   m_ObjectHideFlags: 1

Assets/Scenes/testEnemy.unity

@@ -488,7 +488,7 @@ Prefab:
       objectReference: {fileID: 0}
     - target: {fileID: 1560605499280558, guid: 7c6db9a9ca4150a438bd5114c58a37cf, type: 2}
       propertyPath: m_IsActive
-      value: 1
+      value: 0
       objectReference: {fileID: 0}
     m_RemovedComponents: []
   m_SourcePrefab: {fileID: 100100000, guid: 7c6db9a9ca4150a438bd5114c58a37cf, type: 2}
@@ -1893,3 +1893,45 @@ RectTransform:
   m_AnchoredPosition: {x: 0, y: 0}
   m_SizeDelta: {x: 0, y: 0}
   m_Pivot: {x: 0, y: 0}
+--- !u!1001 &2118897079
+Prefab:
+  m_ObjectHideFlags: 0
+  serializedVersion: 2
+  m_Modification:
+    m_TransformParent: {fileID: 0}
+    m_Modifications:
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalPosition.x
+      value: 0.862
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalPosition.y
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalPosition.z
+      value: 0
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalRotation.x
+      value: -0
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalRotation.y
+      value: -0
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalRotation.z
+      value: -0
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_LocalRotation.w
+      value: 1
+      objectReference: {fileID: 0}
+    - target: {fileID: 4639192263818050, guid: a164c147037e89448820f7387c724c42, type: 2}
+      propertyPath: m_RootOrder
+      value: 14
+      objectReference: {fileID: 0}
+    m_RemovedComponents: []
+  m_SourcePrefab: {fileID: 100100000, guid: a164c147037e89448820f7387c724c42, type: 2}
+  m_IsPrefabAsset: 0

Assets/Scripts/Characters/Enemy/Enemy.cs

@@ -37,7 +37,7 @@ public class Enemy : MonoBehaviour {
     // for animation
     private Animator animator;
     public bool Invisible { get; private set; }
-    public bool Untouchable { get; private set; }
+    public bool DuringKnockback { get; private set; }
     public float PlayerDistance { get; private set; }
     private readonly float knockbackCritPoint = 0.25f;
 
@@ -57,16 +57,62 @@ public class Enemy : MonoBehaviour {
     private void Start()
     {
         currHealth = maxHealth;
-        Invisible = Untouchable = false;
+        Invisible = DuringKnockback = false;
         dropTable = enemyManager.DropTableByID[monsterID];
         Physics2D.IgnoreCollision(enemyManager.Player.gameObject.GetComponent<Collider2D>(), transform.parent.GetComponent<Collider2D>());
     }
 
+    private void FixedUpdate()
+    {
+        bool wallTest = IsTouchingWall();
+        if (wallTest)
+        {
+            Debug.Log("Touching wall");
+        }
+        bool cliffTest = IsAdvancingToCliff();
+        if (cliffTest)
+        {
+            Debug.Log("Advancing to cliff");
+        }
+    }
+
     private void Update()
     {
         PlayerDistance = Vector2.Distance(enemyManager.Player.transform.position, transform.parent.position);
     }
 
+    // check whether enemy is advancing to cliff
+    public bool IsAdvancingToCliff()
+    {
+        Vector2 velocity = transform.parent.GetComponent<Rigidbody2D>().velocity;
+        Vector2 colliderSize = transform.parent.GetComponent<BoxCollider2D>().size;
+
+        if (velocity.x == 0) { return false; }
+        int enemyDir = (velocity.x > 0) ? 1 : -1;
+
+        Vector2 origin = (Vector2)transform.parent.position + enemyDir * new Vector2(colliderSize.x / 2.0f, 0);
+        Vector2 direction = Vector2.down;
+        float distance = colliderSize.y / 2.0f;
+        int layerMask = LayerMask.NameToLayer("platform");
+        RaycastHit2D hit = Physics2D.Raycast(origin, direction, distance, layerMask);
+
+        return (hit.collider == null);
+    }
+
+    public bool IsTouchingWall()
+    {
+        int enemyDir = (transform.parent.eulerAngles.y == 180.0f) ? 1 : -1;
+        Vector2 colliderSize = transform.parent.GetComponent<BoxCollider2D>().size;
+
+        Vector2 origin = (Vector2)transform.parent.position + enemyDir * new Vector2(colliderSize.x / 2.0f, 0);
+        Vector2 direction = Vector2.right * enemyDir;
+        float distance = 0.02f;
+        int layerMask = LayerMask.GetMask("Wall", "OuterWall");
+        RaycastHit2D hit = Physics2D.Raycast(origin, direction, distance, layerMask);
+
+        return (hit.collider != null);
+    }
+
     // hit by player or debuff
     public void GetDamaged(PlayerAttackInfo attack) { 
         currHealth -= attack.damage;
@@ -79,6 +125,8 @@ public class Enemy : MonoBehaviour {
         float knockbackDist = attack.damage * attack.knockBackMultiplier / weight;
         float knockbackTime = (knockbackDist >= 0.5f) ? 0.5f : knockbackDist;
 
+        if (!DuringKnockback)
+        {
             StartCoroutine(Knockback(knockbackDist, knockbackTime));
 
             if (knockbackDist >= knockbackCritPoint)
@@ -87,6 +135,7 @@ public class Enemy : MonoBehaviour {
                 animator.SetTrigger("DamagedTrigger");
             }
         }
+    }
 
     // Animation Event
     // Dead
@@ -141,7 +190,7 @@ public class Enemy : MonoBehaviour {
     // Knockback
     IEnumerator Knockback(float knockbackDist, float knockbackTime)
     {
-        Untouchable = true;
+        DuringKnockback = true;
         bool isPlayerLeft = (enemyManager.Player.transform.position.x - transform.parent.position.x <= 0);
 
         float knockbackVelocity = ((isPlayerLeft) ? 1 : -1) * knockbackDist / knockbackTime;
@@ -153,7 +202,7 @@ public class Enemy : MonoBehaviour {
 
         yield return new WaitForSeconds(knockbackTime);
 
-        Untouchable = false;
+        DuringKnockback = false;
     }
 
     // Debuff