[TASK] Spawn collectable ducks on the map when in range

Assets/CollectableDuckManager.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using Mapbox.CheapRulerCs;
 using Mapbox.Unity.Map;
 using UnityEngine;
 using UnityEngine.Serialization;
@@ -9,8 +10,18 @@ public class CollectableDuckManager : MonoBehaviour
 {
     [FormerlySerializedAs("CollectableDucks")] public List<CollectableDuckData> collectableDucks;
 
+    Dictionary<CollectableDuckData, CollectableDuck> spawnedDucks = new Dictionary<CollectableDuckData, CollectableDuck>();
+    
     public AbstractMap map;
+    public Transform player;
 
+    /// <summary>
+    /// Spawn distance in meters (i.e. how close should the player be to a duck before it spawns on the map
+    /// </summary>
+    public float spawnDistance = 50;
+
+    public CollectableDuck duckSpawnPrefab;
+    
     private static CollectableDuckManager _instance;
     public static CollectableDuckManager Instance
     {
@@ -25,10 +36,41 @@ public class CollectableDuckManager : MonoBehaviour
 
     private void Update()
     {
+        var ruler = new CheapRuler(map.CenterLatitudeLongitude.x, CheapRulerUnits.Meters);
+        var playerPosition = map.WorldToGeoPosition(player.position).ToArray();
         for (int i = 0; i < collectableDucks.Count; i++)
         {
             var duck = collectableDucks[i];
-            if (duck.LatitudeLongitude)
+            var duckCoord = duck.LatitudeLongitude;
+            var dist = ruler.Distance(duckCoord.ToArray(), playerPosition);
+//            Debug.Log("Distance to " + duck.name + ": " + dist);
+            if (dist < spawnDistance)
+            {
+                if (!spawnedDucks.ContainsKey(duck))
+                {
+                    // Spawn the duck
+                    var duckSpawn = Instantiate(duckSpawnPrefab, map.GeoToWorldPosition(duckCoord), Quaternion.identity,
+                        transform);
+                    var duckModel = Instantiate(duck.ModelPrefab, duckSpawn.transform);
+                    duckModel.transform.localPosition = Vector3.zero;
+
+                    spawnedDucks[duck] = duckSpawn;
+                }
+                else
+                {
+                    if (!spawnedDucks[duck].gameObject.activeSelf)
+                    {
+                        spawnedDucks[duck].gameObject.SetActive(true);
+                    }
+                }
+
+            } else if (spawnedDucks.ContainsKey(duck))
+            {
+                if (spawnedDucks[duck].gameObject.activeSelf)
+                {
+                    spawnedDucks[duck].gameObject.SetActive(false);
+                }
+            }
         }
     }
-}
+}