shuffle pieces and check for win

game/src/Taquin.gd

@@ -11,23 +11,28 @@ export var height: int = 512
 
 var pieces: Array = []
 var missing_piece: Vector2
+var rng = RandomNumberGenerator.new()
 
 func _draw() -> void:
 	draw_rect(Rect2(0, 0, width, height), Color.blue)
+
+func position_for_index(index: Vector2, size: int) -> Vector2:
+	var padding_w = (width - (size * columns)) / (columns + 1)
+	var padding_h = (height - (size * rows)) / (rows + 1)
+	return Vector2(padding_w + index.x * (size + padding_w), padding_h + index.y * (size + padding_h))
 	
+
 func _ready() -> void:
+	rng.randomize()
+
 	for c in range(columns):
 		var pieces_row: Array = []
 		for r in range(rows):
-			
 			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.position = position_for_index(Vector2(c, r), piece.size)
 			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
@@ -38,15 +43,17 @@ func _ready() -> void:
 
 		pieces.append(pieces_row)
 
+	shuffle(10)
+
 func _input(event):
 	if event.is_action_pressed("ui_up"):
-		move_piece(Direction.UP)
-	if event.is_action_pressed("ui_down"):
 		move_piece(Direction.DOWN)
+	if event.is_action_pressed("ui_down"):
+		move_piece(Direction.UP)
 	if event.is_action_pressed("ui_left"):
-		move_piece(Direction.LEFT)
-	if event.is_action_pressed("ui_right"):
 		move_piece(Direction.RIGHT)
+	if event.is_action_pressed("ui_right"):
+		move_piece(Direction.LEFT)
 
 enum Direction { UP, DOWN, LEFT, RIGHT }
 
@@ -74,7 +81,11 @@ func move_piece(direction) -> bool:
 
 	swap(missing_piece, destination)
 	missing_piece = destination
+	
 	update()
+	if check_solved():
+		print("solved")
+	
 	return true
 
 func swap(src: Vector2, dst: Vector2) -> void:
@@ -82,4 +93,17 @@ func swap(src: Vector2, dst: Vector2) -> void:
 	pieces[src.x][src.y] = pieces[dst.x][dst.y]
 	pieces[dst.x][dst.y] = tmp
 	pieces[src.x][src.y].position = position_for_index(src, tmp.size)
-	pieces[dst.x][dst.y].position = position_for_index(dst, tmp.size)
+	pieces[dst.x][dst.y].position = position_for_index(dst, tmp.size)
+
+func shuffle(count: int) -> void:
+	while count > 0:
+		count -= 1
+		var direction = rng.randi_range(Direction.UP, Direction.RIGHT)
+		move_piece(direction)
+
+func check_solved() -> bool:
+	for c in range(columns):
+		for r in range(rows):
+			if pieces[c][r].number != 1 + c + r * columns:
+				return false
+	return true