Implement Game logic

TODO: Game UI with settings and start button, Gamepad input, visuals

Scene/Game.tscn

@@ -1,15 +1,24 @@
-[gd_scene load_steps=3 format=3 uid="uid://clirt527jo4x2"]
+[gd_scene load_steps=5 format=3 uid="uid://drs4bhpd3vrh2"]
 
-[ext_resource type="Script" path="res://Scripts/MapGenerator.gd" id="1_dyj4p"]
+[ext_resource type="Script" path="res://Scripts/GameManager.gd" id="1_lps27"]
 [ext_resource type="Texture2D" uid="uid://vv33w22kwgpc" path="res://Assets/tile.png" id="2_wiemx"]
+[ext_resource type="Script" path="res://Scripts/TileColors.gd" id="3_gnesl"]
+
+[sub_resource type="Resource" id="Resource_22g0s"]
+script = ExtResource("3_gnesl")
+empty = Color(1, 1, 1, 1)
+snake_head = Color(0, 1, 0, 1)
+snake_body = Color(0.133333, 0.545098, 0.133333, 1)
+apple = Color(1, 0, 0, 1)
 
 [node name="Node2D" type="Node2D"]
 
 [node name="GameManager" type="Node" parent="."]
 
 [node name="Map" type="Node2D" parent="."]
-script = ExtResource("1_dyj4p")
+script = ExtResource("1_lps27")
 texture = ExtResource("2_wiemx")
+tile_color = SubResource("Resource_22g0s")
 
 [node name="Camera2D" type="Camera2D" parent="."]
 

Scripts/GameManager.gd

@@ -0,0 +1,118 @@
+extends Node
+
+@export var map_size := 15
+@export var texture : Texture2D
+@export var scale := 32.0
+@export var gaps := 4
+@export var speed := 0.25
+
+@export var tile_color := TileColors.new()
+
+var tiles = []
+var snake_move_vector : Vector2
+var last_snake_move_vector : Vector2
+var snake_length : int
+
+var rng = RandomNumberGenerator.new()
+var timer := 0.0
+
+func generate_tiles():
+	for x in range(map_size):
+		tiles.append([])
+		tiles[x] = []
+		for y in range(map_size):
+			var tile = Tile.new()
+			tile.texture = texture
+			tile.tile_color = tile_color
+			tile.scale = Vector2(scale, scale)
+			tile.position = Vector2(x * ( scale + gaps ) -  map_size / 2 * (scale + gaps), y * (scale + gaps)  -  map_size / 2 * (scale + gaps))
+			self.add_child(tile)
+			tiles[x].append([])
+			tiles[x][y] = tile
+	pass
+	
+func generate_apple():
+	var foundViablePosition := false
+	var tile : Tile
+	while !foundViablePosition:
+		tile = tiles[rng.randi_range(0, map_size -1)][rng.randi_range(0, map_size -1)] as Tile
+		if(tile.state == Tile.States.EMPTY):
+			foundViablePosition = true
+			
+	tile.state = Tile.States.APPLE
+	pass
+	
+func set_snake_to_start_position():
+	#No need for float protection, godot automaticly converts floats to ints in this case
+	var tile = (tiles[map_size / 2][map_size / 2] as Tile)
+	tile.state = Tile.States.SNAKE
+	tile.snake_pos = 1
+	pass
+	
+func read_input() -> Vector2:#
+	# cant use Input.get_vector because it normalizes the vector
+	return Vector2(Input.get_axis("left", "right"), Input.get_axis("up", "down"))
+
+
+func process_tiles():
+	var new_snake_head : Tile
+	for x in range(map_size):
+		for y in range(map_size):
+			var tile = tiles[x][y] as Tile
+			if tile.state == Tile.States.SNAKE:
+				if tile.snake_pos == 1:
+					if x + snake_move_vector.x >= map_size || x + snake_move_vector.x < 0 || y + snake_move_vector.y >= map_size || y + snake_move_vector.y < 0:
+						game_stop()
+						return
+					new_snake_head = tiles[x + snake_move_vector.x][y + snake_move_vector.y] as Tile
+				tile.snake_pos += 1
+				if(tile.snake_pos > snake_length):
+					tile.snake_pos = 0
+					tile.state = Tile.States.EMPTY
+	
+	var was_apple = new_snake_head.state == Tile.States.APPLE
+	new_snake_head.snake_pos = 1
+	new_snake_head.state = Tile.States.SNAKE
+	last_snake_move_vector = snake_move_vector
+	if was_apple:
+		snake_length += 1
+		generate_apple()
+	pass
+
+func process_snake_rotation():
+	var input = read_input()
+	print(input)
+	# Return if no Input or Input into multiple directions
+	if input.length() == 0 || input.length() > 1:
+		return
+	#return if input is the inverse of the moving direction
+	if input * -1 == last_snake_move_vector:
+		return
+	# set move direction into inpu direction
+	snake_move_vector = input.normalized()
+
+func _ready():
+	game_start()
+	pass
+	
+func game_start():
+	snake_move_vector = Vector2.RIGHT
+	last_snake_move_vector = snake_move_vector
+	snake_length = 3
+	tiles.clear()
+	generate_tiles()
+	set_snake_to_start_position()
+	generate_apple()
+	pass
+	
+func game_stop():
+	print("dead")
+	pass
+
+func _process(delta):
+	process_snake_rotation()
+	if(timer >= speed):
+		timer = 0
+		process_tiles()
+	timer += delta
+	pass

Scripts/MapGenerator.gd

@@ -1,52 +0,0 @@
-extends Node
-
-@export var map_size := 15
-@export var texture : Texture2D
-@export var scale := 32.0
-@export var gaps := 4
-
-@export_category("Colors")
-@export var tile_color := Color.WHITE
-@export var snake_color := Color.GREEN
-@export var apple_color := Color.RED
-
-# Array of all Tiles of the Map
-var tiles = []
-
-
-func generate_tiles():
-	for x in range(map_size):
-		tiles.append([])
-		tiles[x] = []
-		for y in range(map_size):
-			var tile = Tile.new()
-			tile.texture = texture
-			tile.scale = Vector2(scale, scale)
-			tile.position = Vector2(x * ( scale + gaps ) -  map_size / 2 * (scale + gaps), y * (scale + gaps)  -  map_size / 2 * (scale + gaps))
-			self.add_child(tile)
-			tiles[x].append([])
-			tiles[x][y] = tile
-	pass
-
-func _ready():
-	generate_tiles()
-	pass
-
-func update_tile_colors():
-	for x in range(map_size):
-		for y in range(map_size):
-			match tiles[x][y].get_state():
-				
-				Tile.States.EMPTY:
-					tiles[x][y].modulate = tile_color
-				
-				Tile.States.SNAKE:
-					tiles[x][y].modulate = snake_color
-				
-				Tile.States.APPLE:
-					tiles[x][y].modulate = apple_color
-	pass
-
-func _process(delta):
-	update_tile_colors()
-	pass

Scripts/Tile.gd

@@ -9,12 +9,23 @@ enum States {
 }
 
 @export var state : States
+# 0 means no snake at all, 1 means head and the biger, the further it is from the head
+@export var snake_pos := 0
+@export var tile_color : TileColors
 
 func _init():
 	state = States.EMPTY
 
-func get_state() -> States:
+func update_color():
-	return state
+	match state:
+		States.EMPTY:
+			self.modulate = tile_color.empty
+		States.SNAKE:
+			self.modulate = tile_color.snake_body if snake_pos > 1 else tile_color.snake_head
+		States.APPLE:
+			self.modulate = tile_color.apple
+	pass
 
-func set_state(_state : States):
+func _process(delta):
-	state = _state
+	update_color()
+	pass

Scripts/TileColors.gd

@@ -0,0 +1,8 @@
+extends Resource
+
+class_name TileColors
+
+@export var empty := Color.WHITE
+@export var snake_head := Color.GREEN
+@export var snake_body := Color.FOREST_GREEN
+@export var apple := Color.RED

project.godot

@@ -15,6 +15,33 @@ run/main_scene="res://Scene/Game.tscn"
 config/features=PackedStringArray("4.0", "GL Compatibility")
 config/icon="res://icon.svg"
 
+[input]
+
+left={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":65,"key_label":0,"unicode":97,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194319,"key_label":0,"unicode":0,"echo":false,"script":null)
+]
+}
+right={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":68,"key_label":0,"unicode":100,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194321,"key_label":0,"unicode":0,"echo":false,"script":null)
+]
+}
+up={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":87,"key_label":0,"unicode":119,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194320,"key_label":0,"unicode":0,"echo":false,"script":null)
+]
+}
+down={
+"deadzone": 0.5,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":83,"key_label":0,"unicode":115,"echo":false,"script":null)
+, Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194322,"key_label":0,"unicode":0,"echo":false,"script":null)
+]
+}
+
 [rendering]
 
 renderer/rendering_method="gl_compatibility"