[Player] Add AI Pathfinding on a 2D grid to the player character

Assets/External/AstarPathfindingProject/ExampleScenes/ExampleScripts/TargetMover.cs

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+using UnityEngine;
+using System.Linq;
+
+namespace Pathfinding {
+	/// <summary>
+	/// Moves the target in example scenes.
+	/// This is a simple script which has the sole purpose
+	/// of moving the target point of agents in the example
+	/// scenes for the A* Pathfinding Project.
+	///
+	/// It is not meant to be pretty, but it does the job.
+	/// </summary>
+	[HelpURL("http://arongranberg.com/astar/docs/class_pathfinding_1_1_target_mover.php")]
+	public class TargetMover : MonoBehaviour {
+		/// <summary>Mask for the raycast placement</summary>
+		public LayerMask mask;
+
+		public Transform target;
+		IAstarAI[] ais;
+
+		/// <summary>Determines if the target position should be updated every frame or only on double-click</summary>
+		public bool onlyOnDoubleClick;
+		public bool use2D;
+
+		Camera cam;
+
+		public void Start () {
+			//Cache the Main Camera
+			cam = Camera.main;
+			// Slightly inefficient way of finding all AIs, but this is just an example script, so it doesn't matter much.
+			// FindObjectsOfType does not support interfaces unfortunately.
+			ais = FindObjectsOfType<MonoBehaviour>().OfType<IAstarAI>().ToArray();
+			useGUILayout = false;
+		}
+
+		public void OnGUI () {
+			if (onlyOnDoubleClick && cam != null && Event.current.type == EventType.MouseDown && Event.current.clickCount == 2) {
+				UpdateTargetPosition();
+			}
+		}
+
+		/// <summary>Update is called once per frame</summary>
+		void Update () {
+			if (!onlyOnDoubleClick && cam != null) {
+				UpdateTargetPosition();
+			}
+		}
+
+		public void UpdateTargetPosition () {
+			Vector3 newPosition = Vector3.zero;
+			bool positionFound = false;
+
+			if (use2D) {
+				newPosition = cam.ScreenToWorldPoint(Input.mousePosition);
+				newPosition.z = 0;
+				positionFound = true;
+			} else {
+				// Fire a ray through the scene at the mouse position and place the target where it hits
+				RaycastHit hit;
+				if (Physics.Raycast(cam.ScreenPointToRay(Input.mousePosition), out hit, Mathf.Infinity, mask)) {
+					newPosition = hit.point;
+					positionFound = true;
+				}
+			}
+
+			if (positionFound && newPosition != target.position) {
+				target.position = newPosition;
+
+				if (onlyOnDoubleClick) {
+					for (int i = 0; i < ais.Length; i++) {
+						if (ais[i] != null) ais[i].SearchPath();
+					}
+				}
+			}
+		}
+	}
+}