test scene, render issues, collision issues

problems :
- there were no test scene
- units would appear weird over some tiles
- units would not recognize some tiles when trying to know if it could place itself on it

solution :
- added test scene
- tweaked sorting layers in units
- added IsCollidable parameter in ILevelObject

Assets/LevelEditor/Levels/TestDrag&Drop.asset

@@ -0,0 +1,346 @@
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+  m_ScaleFactor: 1
+  m_ReferenceResolution: {x: 800, y: 600}
+  m_ScreenMatchMode: 0
+  m_MatchWidthOrHeight: 0
+  m_PhysicalUnit: 3
+  m_FallbackScreenDPI: 96
+  m_DefaultSpriteDPI: 96
+  m_DynamicPixelsPerUnit: 1
+  m_PresetInfoIsWorld: 0
+--- !u!223 &2091724717
+Canvas:
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+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2091724714}
+  m_Enabled: 1
+  serializedVersion: 3
+  m_RenderMode: 0
+  m_Camera: {fileID: 0}
+  m_PlaneDistance: 100
+  m_PixelPerfect: 0
+  m_ReceivesEvents: 1
+  m_OverrideSorting: 0
+  m_OverridePixelPerfect: 0
+  m_SortingBucketNormalizedSize: 0
+  m_AdditionalShaderChannelsFlag: 25
+  m_SortingLayerID: 0
+  m_SortingOrder: 0
+  m_TargetDisplay: 0
+--- !u!224 &2091724718
+RectTransform:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2091724714}
+  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
+  m_LocalScale: {x: 0, y: 0, z: 0}
+  m_ConstrainProportionsScale: 0
+  m_Children:
+  - {fileID: 1216531426}
+  m_Father: {fileID: 0}
+  m_RootOrder: 2
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Assets/Scenes/TestDragAndDrop.unity.meta

@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: ef3e0ed465c76b148a3db01e8996960a
+DefaultImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Scripts/GameObjectPlacementButton.cs

@@ -20,6 +20,7 @@ public class GameObjectPlacementButton : UnitPlacementButton
         outline.transform.localPosition = Vector2.zero;
 
         var rend = outline.AddComponent<SpriteRenderer>();
+        rend.sortingLayerName = "Character";
         rend.sortingOrder = 1;
         rend.sprite = Sprite.Create(new Texture2D(100, 100), new Rect(0, 0, 100, 100), Vector2.one * 0.5f);
 

Assets/Scripts/LevelManager/ILevelObject.cs

@@ -10,6 +10,7 @@ public interface ILevelObject
         Tilemap = 2
     }
 
+    bool IsCollidable { get; }
     string Name { get; }
     Vector3 Position { get; }
     void LevelUpdate();

Assets/Scripts/LevelManager/LevelManager.cs

@@ -21,6 +21,22 @@ public class LevelManager : Singleton<LevelManager>
     private readonly List<ILevelObject> _toRemove;
     private readonly List<ILevelObject> _levelObjects;
 
+    private Tilemap _dynamicTilemap;
+    public Tilemap DynamicTilemap
+    {
+        get
+        {
+            if (!_dynamicTilemap)
+            {
+                var grid = Object.FindObjectOfType<Grid>();
+                _dynamicTilemap = new GameObject("Dynamic").AddComponent<Tilemap>();
+                _dynamicTilemap.gameObject.AddComponent<TilemapRenderer>().sortingOrder = 3;
+                _dynamicTilemap.transform.SetParent(grid.transform);
+                _dynamicTilemap.tileAnchor = Vector3.zero;
+            }
+            return _dynamicTilemap;
+        }
+    }
     private Level _currentLevel;
     public Level CurrentLevel => _currentLevel;
 

Assets/Scripts/LevelManager/LevelObject.cs

@@ -10,6 +10,8 @@ public abstract class LevelObject : MonoBehaviour, ILevelObject
     public Vector3 Position { get => transform.position; protected set => transform.position = value; }
     public string Name { get => name; protected set => name = value; }
 
+    public bool IsCollidable => GetComponent<Collider2D>();
+
     void Awake()
     {
         if (LevelManager.Instance.Has<LevelObject>(obj => obj.Equals(this))) return;

Assets/Scripts/LevelManager/LevelTile.cs

@@ -13,6 +13,10 @@ public abstract class LevelTile : TileBase, ILevelObject
     public Sprite Sprite => _sprite;
     public bool Instantiated { get; set; }
 
+    [SerializeField]
+    private bool _isCollidable;
+    public bool IsCollidable => _isCollidable;
+
     public Vector3 Position { get; protected set; }
 
     private Tilemap _tilemap;
@@ -88,7 +92,8 @@ public abstract class LevelTile : TileBase, ILevelObject
             {nameof(Name), Name },
             {nameof(Position), new float[]{Position.x, Position.y, Position.z } },
             {nameof(TilemapName), TilemapName },
-            {nameof(ILevelObject.ObjectType), nameof(ILevelObject.ObjectType.Tile) }
+            {nameof(ILevelObject.ObjectType), nameof(ILevelObject.ObjectType.Tile) },
+            {nameof(_isCollidable), _isCollidable }
         };
     }
 
@@ -97,7 +102,7 @@ public abstract class LevelTile : TileBase, ILevelObject
         Name = dict[nameof(Name)].ToString();
         Position = dict[nameof(Position)].ToVector3();
         var tilemapName = dict[nameof(TilemapName)].ToString();
-
+        _isCollidable = bool.Parse(dict[nameof(_isCollidable)].ToString());
         _tilemap = FindObjectOfType<Grid>().GetComponentInChildren<Tilemap>(tilemapName);
     }
 

Assets/Scripts/ObjectDraggablePlaceholder.cs

@@ -7,4 +7,13 @@ public class ObjectDraggablePlaceholder : DraggablePlaceholder
     {
         Prefab.Create(transform.position);
     }
+
+    public override bool CanBePlacedHere()
+    {
+        var can = base.CanBePlacedHere();
+
+        var hasCollidable = LevelManager.Instance.Has<ILevelObject>(obj => transform.position.IsInTile(obj.Position) && obj.IsCollidable);
+
+        return can || !hasCollidable;
+    }
 }

Assets/TilePlaceholder.cs

@@ -5,6 +5,7 @@ public class TilePlaceholder : DraggablePlaceholder
     public LevelTile Tile { get; set; }
     public override void Place()
     {
-        LevelManager.Instance.Get<LevelTile>().Tilemap.SetTile(Vector3Int.RoundToInt(transform.position), Tile);
+        
+        LevelManager.Instance.DynamicTilemap.SetTile(Vector3Int.RoundToInt(transform.position), Tile);
     }
 }

Assets/Tiles/EnemySpawner.asset

@@ -13,6 +13,7 @@ MonoBehaviour:
   m_Name: EnemySpawner
   m_EditorClassIdentifier: 
   _sprite: {fileID: 21300000, guid: b85a4b2ec6433d04895612d791edc260, type: 3}
+  _isCollidable: 1
   _prefab: {fileID: 6962989255644195630, guid: 377c7275c0001cc47a6b8926ac57d573, type: 3}
   _spawnOnStart: 1
   _spawnSpeed: 0

Assets/Tiles/StickSpawner.asset

@@ -13,6 +13,7 @@ MonoBehaviour:
   m_Name: StickSpawner
   m_EditorClassIdentifier: 
   _sprite: {fileID: 21300000, guid: 77a39e873655d3c4b93d0b7696397b83, type: 3}
+  _isCollidable: 1
   _prefab: {fileID: 6962989255644195630, guid: 6cd87b398e7a0e94580f4fcbe2fd310a, type: 3}
   _spawnOnStart: 1
   _spawnSpeed: 0