put a number on each piece

game/src/Piece.gd

@@ -3,6 +3,13 @@ class_name Piece
 tool
 
 export var size: int = 64
+var number: int = 0
 
 func _draw() -> void:
-	draw_rect(Rect2(0, 0, size, size), Color.yellow)
+	draw_rect(Rect2(0, 0, size, size), Color.yellow)
+
+func set_number(num: int) -> void:
+	number = num
+
+func _ready() -> void:
+	$Label.text = str(number)

game/src/Piece.tscn

@@ -2,5 +2,11 @@
 
 [ext_resource path="res://src/Piece.gd" type="Script" id=1]
 
-[node name="Node2D" type="Node2D"]
+[node name="Piece" type="Node2D"]
 script = ExtResource( 1 )
+
+[node name="Label" type="Label" parent="."]
+margin_right = 40.0
+margin_bottom = 14.0
+custom_colors/font_color = Color( 0, 0, 0, 1 )
+text = "!"

game/src/Taquin.gd

@@ -2,6 +2,8 @@ extends Node2D
 class_name Taquin
 tool
 
+var Piece = preload("res://src/Piece.tscn")
+
 export var rows: int = 4
 export var columns: int = 4
 export var width: int = 512
@@ -18,17 +20,20 @@ func _ready() -> void:
 		var pieces_row: Array = []
 		for r in range(rows):
 			
-			var piece = Piece.new()
+			var piece = Piece.instance()
+
 			var padding_w = (width - (piece.size * columns)) / (columns + 1)
 			var padding_h = (height - (piece.size * rows)) / (rows + 1)
 			var initial_position = Vector2(padding_w + c * (piece.size + padding_w), padding_h + r * (piece.size + padding_h))
+			piece.set_number(1 + c + r * columns)
 			piece.translate(initial_position)
 			
 			if r == rows - 1 && c == columns - 1:
 				piece.visible = false
 				missing_piece.x = c
 				missing_piece.y = r
-			
+
 			add_child(piece)
 			pieces_row.append(piece)
+
 		pieces.append(pieces_row)

game/src/Taquin.tscn

@@ -2,5 +2,5 @@
 
 [ext_resource path="res://src/Taquin.gd" type="Script" id=1]
 
-[node name="Node2D" type="Node2D"]
+[node name="Taquin" type="Node2D"]
 script = ExtResource( 1 )