Adds fruit to the arena that grow the snake

Scenes/fruit.tscn

@@ -0,0 +1,18 @@
+[gd_scene load_steps=4 format=3 uid="uid://bldekmt1rakjl"]
+
+[ext_resource type="Script" uid="uid://dcdogfvb8xjod" path="res://Scripts/fruit.gd" id="1_o20pv"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_hf2pu"]
+size = Vector2(18, 18)
+
+[sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_kum7e"]
+size = Vector2(20, 20)
+
+[node name="Fruit" type="Area2D" groups=["BlocksSpawn"]]
+script = ExtResource("1_o20pv")
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="."]
+shape = SubResource("RectangleShape2D_hf2pu")
+
+[node name="Sprite2D" type="Sprite2D" parent="."]
+texture = SubResource("PlaceholderTexture2D_kum7e")

Scenes/level.tscn

@@ -16,7 +16,7 @@ fill = 2
 fill_from = Vector2(0.5, 0.495413)
 fill_to = Vector2(0, 0)
 
-[node name="Level" type="Area2D"]
+[node name="Level" type="Area2D" groups=["Level"]]
 monitorable = false
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="."]

Scenes/main.tscn

@@ -1,7 +1,8 @@
-[gd_scene load_steps=3 format=3 uid="uid://bs6an72avch86"]
+[gd_scene load_steps=4 format=3 uid="uid://bs6an72avch86"]
 
 [ext_resource type="PackedScene" uid="uid://gkqku38yb2ng" path="res://Scenes/level.tscn" id="1_bo1nx"]
 [ext_resource type="PackedScene" uid="uid://d0okbjqyaoe0w" path="res://Scenes/snake_part.tscn" id="2_8gbba"]
+[ext_resource type="PackedScene" uid="uid://bldekmt1rakjl" path="res://Scenes/fruit.tscn" id="3_8gbba"]
 
 [node name="Main" type="Node2D"]
 
@@ -16,5 +17,8 @@ autostart = true
 [node name="SnakePart" parent="." instance=ExtResource("2_8gbba")]
 position = Vector2(420, 240)
 
+[node name="Fruit" parent="." instance=ExtResource("3_8gbba")]
+position = Vector2(707, 325)
+
 [connection signal="area_exited" from="Level" to="SnakePart" method="_on_level_area_exited"]
 [connection signal="timeout" from="Timer" to="SnakePart" method="process_movement" binds= [Vector2(0, 0)]]

Scenes/snake_part.tscn

@@ -8,7 +8,7 @@ size = Vector2(18, 18)
 [sub_resource type="PlaceholderTexture2D" id="PlaceholderTexture2D_kum7e"]
 size = Vector2(20, 20)
 
-[node name="SnakePart" type="Area2D"]
+[node name="SnakePart" type="Area2D" groups=["BlocksSpawn"]]
 script = ExtResource("1_iuiyg")
 
 [node name="CollisionShape2D" type="CollisionShape2D" parent="."]

Scripts/fruit.gd

@@ -0,0 +1,33 @@
+extends Area2D
+class_name Fruit
+
+const TILE_SIZE = 20
+
+var all_positions : Array[Vector2] = []
+
+func _ready() -> void:
+	var level : Area2D = get_tree().get_first_node_in_group("Level")
+	var x_bounds : Vector2 = level.position.x * Vector2.ONE + Vector2(-TILE_SIZE, TILE_SIZE) * level.scale.x / 2
+	var y_bounds : Vector2 = level.position.y * Vector2.ONE + Vector2(-TILE_SIZE, TILE_SIZE) * level.scale.y / 2
+	
+	var possible_x : Array = range(x_bounds.x, x_bounds.y, TILE_SIZE)
+	var possible_y : Array = range(y_bounds.x, y_bounds.y, TILE_SIZE)
+	
+	for x in possible_x:
+		for y in possible_y:
+			all_positions.append(Vector2(x, y))
+	
+	respawn()
+
+func respawn() -> void:
+	var possible_positions = all_positions.duplicate()
+	
+	var obstacles : Array[Node] = get_tree().get_nodes_in_group("BlocksSpawn")
+	
+	for obstacle in obstacles:
+		if obstacle is Area2D:
+			possible_positions.erase(obstacle.position)
+	
+	var chosen_position = possible_positions.pick_random()
+	
+	position = chosen_position

Scripts/fruit.gd.uid

@@ -0,0 +1 @@
+uid://dcdogfvb8xjod

Scripts/snake_part.gd

@@ -14,19 +14,22 @@ var inputs : Dictionary[String, Vector2] = {"right": Vector2.RIGHT,
 
 
 @onready
-var raycast_right = $RightRayCast2D
+var raycast_right : RayCast2D = $RightRayCast2D
 @onready
-var raycast_left = $LeftRayCast2D
+var raycast_left : RayCast2D = $LeftRayCast2D
 @onready
-var raycast_up = $UpRayCast2D
+var raycast_up : RayCast2D = $UpRayCast2D
 @onready
-var raycast_down = $DownRayCast2D
+var raycast_down : RayCast2D = $DownRayCast2D
 
 
-var snake_part_obj = preload("res://Scenes/snake_part.tscn")
+var snake_part_obj : PackedScene = preload("res://Scenes/snake_part.tscn")
 
 @onready
-var timer_ref = $"../Timer"
+var timer_ref : Timer = $"../Timer"
+
+var next_part : SnakePart = null
+var skip_next_move_propagation : bool = false
 
 signal do_movement(new_dir)
 
@@ -40,6 +43,7 @@ func _ready() -> void:
 		var body = snake_part_obj.instantiate()
 		body.part_type = PartTypes.BODY
 		body.position = (position - current_direction * TILE_SIZE).snapped(Vector2.ONE * TILE_SIZE)
+		next_part = body
 		get_parent().add_child.call_deferred(body)
 		do_movement.connect(body.process_movement)
 		
@@ -47,26 +51,34 @@ func _ready() -> void:
 		var tail = snake_part_obj.instantiate()
 		tail.part_type = PartTypes.TAIL
 		tail.position = (position - current_direction * TILE_SIZE * 2).snapped(Vector2.ONE * TILE_SIZE)
+		body.next_part = tail
 		get_parent().add_child.call_deferred(tail)
 		body.do_movement.connect(tail.process_movement)
 	else:
+		
+		# Free raycasts if we don't need them (consider only loading them in for the head for performance if needed)
 		raycast_down.queue_free()
 		raycast_up.queue_free()
 		raycast_left.queue_free()
 		raycast_right.queue_free()
-	#elif part_type == PartTypes.BODY:
-		#area_entered.connect(_on_part_area_entered)
-	#elif part_type == PartTypes.TAIL:
-		#area_entered.connect(_on_part_area_entered)
 
 
 
 func process_movement(new_direction : Vector2) -> void:
+	
+	# The head needs to check if we are about to collide with something
 	if part_type == PartTypes.HEAD:
 		check_movement()
+	
+	# Update the position of this part
 	position = (position + current_direction * TILE_SIZE).snapped(Vector2.ONE * TILE_SIZE)
-	#process_collisions();
+	
-	do_movement.emit(current_direction)
+	# Tell the next part to move and give it the direction we are moving
+	if !skip_next_move_propagation:
+		do_movement.emit(current_direction)
+	skip_next_move_propagation = false
+	
+	# Unless we are the head, change our direction to the direction given
 	if new_direction != Vector2.ZERO:
 		current_direction = new_direction
 
@@ -84,24 +96,44 @@ func check_movement() -> void:
 	
 	# Look using the raycast for anything to collide with
 	var object_in_path : Object = raycast_to_use.get_collider()
+	
+	# If we found nothing, stop processing collision
 	if object_in_path == null:
 		return
+		
+	# If we found a snake part, then either end the game or perform an ouroboros maneouvre
 	if object_in_path is SnakePart:
 		match object_in_path.part_type:
 			PartTypes.BODY:
 				lose_game()
 			PartTypes.TAIL:
 				ouroboros()
+	if object_in_path is Fruit:
+		object_in_path.respawn()
+		extend()
 
-#func process_collisions() -> void:
+func extend() -> void:
-	#var colliding_areas = get_overlapping_areas()
+	# Remove old connection to previous next part
-	#for area in colliding_areas:
+	do_movement.disconnect(next_part.process_movement)
-		#if area is SnakePart:
+	
-			#match area.part_type:
+	# Set up a body part to be in the chain
-				#PartTypes.BODY:
+	var new_body = snake_part_obj.instantiate()
-					#lose_game()
+	new_body.part_type = PartTypes.BODY
-				#PartTypes.TAIL:
+	new_body.position = (position).snapped(Vector2.ONE * TILE_SIZE)
-					#ouroboros()
+	get_parent().add_child(new_body)
+	do_movement.connect(new_body.process_movement)
+	new_body.do_movement.connect(next_part.process_movement)
+	new_body.next_part = next_part
+	
+	# Set direction of new part
+	new_body.current_direction = current_direction
+	
+	# Update reference to next part
+	next_part = new_body
+	
+	# Mark the next movement to not propagate the movement down the chain
+	skip_next_move_propagation = true
+	
 
 func lose_game() -> void:
 	# You lose!
@@ -112,18 +144,14 @@ func ouroboros() -> void:
 	print("You have achieved the ouroboros!")
 
 func _unhandled_input(event: InputEvent) -> void:
+	
+	# Change direction if we are the head
 	if event is InputEventKey and part_type == PartTypes.HEAD:
 		for dir in inputs.keys():
 			if event.is_action_pressed(dir):
 				current_direction = inputs[dir]
 
-#func _on_part_area_entered(area: Area2D) -> void:
-	#if area.get("part_type") != PartTypes.HEAD:
-		#return
-	#if part_type == PartTypes.BODY or part_type == PartTypes.DEAD:
-		#lose_game()
-	#elif part_type == PartTypes.TAIL:
-		#ouroboros()
 
+# If we leave the arena
 func _on_level_area_exited(area: Area2D) -> void:
 	lose_game()

project.godot

@@ -14,6 +14,11 @@ config/name="Ouroboros"
 config/features=PackedStringArray("4.4", "GL Compatibility")
 config/icon="res://icon.svg"
 
+[global_group]
+
+Level=""
+BlocksSpawn=""
+
 [input]
 
 right={