Grid finally working and understood

Scenes/Main/main.gd

@@ -18,6 +18,9 @@ var _MovingMarker: Node2D = _MovingMarkerScene.instantiate()
 
 @onready var GroundLayer: TileMapLayer = $Map/Ground
 
+var aStarGrid: AStarGrid2D:
+	set(v): aStarGrid = v;
+
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
 #	add_child(_MovingMarker)
@@ -26,7 +29,7 @@ func _ready() -> void:
 	# create unit at local position (50, 50) => eg mouse position
 	_createUnit(GroundLayer.local_to_map(Vector2i(50, 50)))
 	# create unit at map position (50, 50) => tile x = 50, y = 50 in the map
-	_createUnit(GroundLayer.map_to_local(Vector2i(50,50)))
+	_createUnit(GroundLayer.map_to_local(Vector2i(25,25)))
 	
 	for unit in _Units:
 		add_child(unit)
@@ -36,9 +39,6 @@ func _ready() -> void:
 #	if firstUnit.is_node_ready():
 #		UnitCamera.target = _Units[0].get_path_to(get_parent())
 #	UnitCamera.target_node = _Units[0]
-	
-	pass
-	
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void:
@@ -63,3 +63,20 @@ func _getScreenCenter():
 	
 func _getMousePosition(event: InputEvent):
 	return get_viewport().get_camera_2d().make_input_local(event)
+
+
+#func prepareAStarGrid():
+#	var astarGrid = AStarGrid2D.new()
+#	astarGrid.cell_size = GroundLayer.tile_set.tile_size
+#	astarGrid.region = Rect2(Vector2.ZERO, ceil(get_viewport_rect().size / astarGrid.cell_size))
+#	astarGrid.update()
+#	
+#	for id in ObstacleLayer.get_used_cells():
+#		var data: TileData = ObstacleLayer.get_cell_tile_data(id)
+#		if data and data.get_custom_data('obstacle'):
+#			astarGrid.set_point_solid(id)
+#		
+#	%GridDisplay.grid = astarGrid
+
+func get_cell_information(cell):
+	print(cell)