How to update Player data from a resource file, after loading the level?

[weranjanadesilva]

Godot Version

4.2.2

Question

Hello all,
I’m currently trying to figure out a solution to my following problem.
Hoping the good people here could provide some insight on achieving the desired result.

I’ve followed a tutorial and implemented a save and load system for my game, using resources.

The following is the structure I’ve created. The following stats will be saved to a file.

PlayerData.gd - Resource file

extends Resource
class_name PlayerData

@export var current_lives: int = 3
@export var max_health: int = 10
@export var current_health: int = max_health
@export var current_shield_amount: int = 0
@export var current_grenade_count: int = 0
@export var current_score: int

@export var current_spawn_pos: Vector2

The “Save” and “Load” functions are located in the player script.

Player.gd - Only included the code snippets relevant to the question.

extends CharacterBody2D

class_name Player

var save_file_path = "user://save/"
var save_file_name = "PlayerSave.tres"
var playerData = PlayerData.new()

func _ready():
	verify_save_directory(save_file_path)

func _physics_process(delta):
	//No code relevant to the question included here

func verify_save_directory(path: String):
	DirAccess.make_dir_absolute(path)
	
func load_data():
	playerData = ResourceLoader.load(save_file_path + save_file_name).duplicate(true)
	print("loaded")
	
func save_data():
	ResourceSaver.save(playerData, save_file_path + save_file_name)
	print("save :" + str( playerData, save_file_path + save_file_name))

Also, there is a Main menu screen with a “Load Game” button.
This should ideally load the game, and update player stats according to what’s there in the save file.

MainMenu.gd

extends Node2D

const START_LEVEL = preload("res://Levels/Level_01.tscn")

@onready var btn_new_game = $VBoxContainer/Btn_NewGame
@onready var btn_load_game = $VBoxContainer/Btn_LoadGame
@onready var btn_quit = $VBoxContainer/Btn_Quit


# Called when the node enters the scene tree for the first time.
func _ready():
	pass

# Called every frame. 'delta' is the elapsed time since the previous frame.
func _process(delta):
	pass

func _on_btn_load_game_pressed():
	get_tree().change_scene_to_file("res://Levels/Level_01.tscn")

Can any of you please guide me on how to achieve this?
Once the player clicks on the “Load Game” button, the level should load and update the player’s stats with what the resource file contains.

Any help on this would be much appreciated.

[herrspaten]

When you enter the scene with your player in it you somehow have to know that you are supposed to load data from a save file. You can do this with a static var inside of the MainMenu.gd (i think you need to give this script a class_name in this case):

class_name MainMenu extends Node2D

static var loading: bool = false


func _on_btn_load_game_pressed():
	MainMenu.loading = true
	get_tree().change_scene_to_file("res://Levels/Level_01.tscn")

And in the player-script you can check in the ready method if you are supposed to load:

func _ready():
	if MainMenu.loading:
		load_data()

[weranjanadesilva]

This worked like a charm. Thank you!