Godot Version
Godot version 4.6.1
Question
When I start the game, I get this error, I have no experience in programming, therefore, I ask you to answer in a clearer way.
It looks like screen_size is null, which means you didn’t assign anything to it. Make sure you set that variable before you try to access it.
In your case, this can probably be achieved with the following line:
var screen_size = DisplayServer.screen_get_size()
Or simply:
screen_size = DisplayServer.screen_get_size()
if you already had the variable screen_size declared above.
I recommend starting out with some basic tutorials so you can get used to the absolute basics and see a project being made from start to finish.
but i use it
And by the way, even though I use it, I still can’t do anything.
I’m not sure what you mean unfortunately. Could you show your entire script? Since the error message tells you that screen_size is null.
extends Area2D
@export var speed = 400 # How fast the player will move (pixels/sec).
var screen_size # Size of the game window.
Called when the node enters the scene tree for the first time.
func _ready() → void:
screen_size = get_viewport_rect().size
pass # Replace with function body.
func _process(delta):
var velocity = Vector2.ZERO # The player’s movement vector.
if Input.is_action_pressed(“move_right”):
velocity.x += 1
if Input.is_action_pressed(“move_left”):
velocity.x += 1
if Input.is_action_pressed(“jump”):
velocity.y += 1
if Input.is_action_pressed(“push”):
velocity.x += 1
if Input.is_action_pressed(“run”):
velocity.y += 1
if velocity.length() > 0:
velocity = velocity.normalized() * speed
$AnimatedSprite2D.play()
else:
$AnimatedSprite2D.stop()
position = velocity * delta
position = position.clamp(Vector2.ZERO, screen_size)
delta=16
screen_size=1
screen_size = DisplayServer.screen_get_size(1)
if velocity.x != 0:
$AnimatedSprite2D.animation = "stand"
$AnimatedSprite2D.flip_v = false
# See the note below about the following boolean assignment.
$AnimatedSprite2D.flip_h = velocity.x < 0
Please try to format your code properly so it’s easier to read for others.
(post deleted by author)
(post deleted by author)
extends Area2D
@exportexport var speed = 400 # How fast the player will move (pixels/sec).
var screen_size # Size of the game window.
Called when the node enters the scene tree for the first time.
func _ready() → void:
>screen_size = get_viewport_rect().size
pass # Replace with function body.
> func _process(delta):
var velocity = Vector2.ZERO # The player’s movement vector.
if Input.is_action_pressed(“move_right”):velocity.x += 1
if Input.is_action_pressed(“move_left”):
velocity.x += 1
if Input.is_action_pressed(“jump”):
velocity.y += 1
if Input.is_action_pressed(“push”):
velocity.x += 1
if Input.is_action_pressed(“run”):
velocity.y += 1
if velocity.length() > 0:
velocity = velocity.normalized() * speed
$AnimatedSprite2D.play()
else:
$AnimatedSprite2D.stop()> > position = velocity * delta
> > position = position.clamp(Vector2.ZERO, screen_size)
delta=16
screen_size=1
screen_size = DisplayServer.screen_get_size(1)if velocity.x != 0:
$AnimatedSprite2D.animation = “stand”
$AnimatedSprite2D.flip_v = falseSee the note below about the following boolean assignment.
$AnimatedSprite2D.flip_h = velocity.x < 0
Is it clearer now?
the two vertical bars mean “> >”
No this is even worse. You misinterpreted the instruction given.
Please just select your code, and in the forum’s own editor, click on the “Preformatted text” buttom.
that’s what i did
extends Area2D
@export var speed = 400 # How fast the player will move (pixels/sec).
var screen_size # Size of the game window.
#Called when the node enters the scene tree for the first time.
func _ready() → void:
> screen_size = get_viewport_rect().size
> pass # Replace with function body.
func _process(delta):
> var velocity = Vector2.ZERO # The player’s movement vector.
> if Input.is_action_pressed(“move_right”):
> > velocity.x += 1
> if Input.is_action_pressed(“move_left”):
> > velocity.x += 1
> if Input.is_action_pressed(“jump”):
> > velocity.y += 1
> if Input.is_action_pressed(“push”):
> > velocity.x += 1
> if Input.is_action_pressed(“run”):
> > velocity.y += 1
> if velocity.length() > 0:
> > velocity = velocity.normalized() * speed
> > $AnimatedSprite2D.play()
> else:
> > $AnimatedSprite2D.stop()
> > position = velocity * delta
> > position = position.clamp(Vector2.ZERO, screen_size)
> > delta=16
> > screen_size=1
> > screen_size = DisplayServer.screen_get_size(1)
> if velocity.x != 0:
> > $AnimatedSprite2D.animation = "stand"
> > $AnimatedSprite2D.flip_v = false
# See the note below about the following boolean assignment.
> > $AnimatedSprite2D.flip_h = velocity.x < 0
like this?
Please remove all the > > symbols you added. Simply copy your code from your editor, paste it in, and use the preformatted text button.
extends Area2D
@export var speed = 400 # How fast the player will move (pixels/sec).
var screen_size # Size of the game window.
Called when the node enters the scene tree for the first time.
func _ready() → void:
screen_size = get_viewport_rect().size
pass # Replace with function body.
func _process(delta):
var velocity = Vector2.ZERO # The player’s movement vector.
if Input.is_action_pressed(“move_right”):
velocity.x += 1
if Input.is_action_pressed(“move_left”):
velocity.x += 1
if Input.is_action_pressed(“jump”):
velocity.y += 1
if Input.is_action_pressed(“push”):
velocity.x += 1
if Input.is_action_pressed(“run”):
velocity.y += 1
if velocity.length() > 0:
velocity = velocity.normalized() * speed
$AnimatedSprite2D.play()
else:
$AnimatedSprite2D.stop()
position = velocity * delta
position = position.clamp(Vector2.ZERO, screen_size)
delta=16
screen_size=1
screen_size = DisplayServer.screen_get_size(1)
if velocity.x != 0:
$AnimatedSprite2D.animation = "stand"
$AnimatedSprite2D.flip_v = false
# See the note below about the following boolean assignment.
$AnimatedSprite2D.flip_h = velocity.x < 0
and yet, when I start the game, my character cannot move, although I have assigned keys, I have written a script, but it does not move. (you don’t need to send me links to training, I’m already using them to make a game)