add basic dialogue system and interactable interface

Assets/PlayerController.cs

@@ -4,6 +4,8 @@ public class PlayerController : MonoBehaviour
 {
     public GameObject DougBody;
     public float walkSpeed;
+
+    Interactable nearestInteractable;
     
     // Start is called once before the first execution of Update after the MonoBehaviour is created
     void Start()
@@ -16,6 +18,7 @@ void Update()
     {
         RotatePlayerTowardMouse();
         Walk();
+        TryInteract();
     }
 
     void Walk()
@@ -33,4 +36,37 @@ void RotatePlayerTowardMouse()
 
         DougBody.transform.rotation = Quaternion.Euler(new Vector3(0f, -(angle + 90), 0f));
     }
+
+    void TryInteract()
+    {
+        if (Input.GetKeyDown(KeyCode.E) && nearestInteractable != null)
+        {
+            nearestInteractable.Interact();
+        }
+    }
+
+    private void OnTriggerEnter(Collider other)
+    {
+        Interactable interactable = other.GetComponent<Interactable>();
+
+        // store nearest interactable if it exists
+        if (interactable != null)
+        {
+            nearestInteractable = interactable;
+            interactable.MoveInsideRange();
+        }
+    }
+
+    private void OnTriggerExit(Collider other)
+    {
+        // just null out interactables when we leave an interactable trigger (we cant and shouldn't overlap interactables)
+        Interactable interactable = other.GetComponent<Interactable>();
+
+        // store nearest interactable if it exists
+        if (interactable != null)
+        {
+            nearestInteractable.MoveOutsideRange();
+            nearestInteractable = null;
+        }
+    }
 }