Player character slows when up or down input is held while moving

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1

I used Input.get_vector() to get around having to make two separate inputs for my x and y values but if either up or down input is held while moving the players x velocity is lowered to 88. I could just bite the bullet and make two separate variables but I was just curious as to why this might be happening and how to circumvent it. Thanks.

Relevant Player Code

extends CharacterBody2D

var walk_speed = 125.0
var climb_speed = 100.0
var deceleration = 1.0
var acceleration = 1.0

var coyote = false
var last_floor = false

func _ready():
	add_to_group("player")
	$coyote_timer.wait_time = 5 / 60.0

func _physics_process(delta):
	var dir = Input.get_vector("left", "right", "up", "down")
	last_floor = is_on_floor()
	
	if dir.x < 0 and is_on_floor():
		$AnimatedSprite2D.flip_h = true
	elif dir.x > 0 and is_on_floor():
		$AnimatedSprite2D.flip_h = false
	
	#Walking
	if dir.x != 0 and is_on_floor():
		$AnimatedSprite2D.play("walk")
		velocity.x = lerp(velocity.x, dir.x * walk_speed, acceleration)
	elif is_on_floor():
		$AnimatedSprite2D.play("idle")
		velocity.x = lerp(velocity.x, 0.0, deceleration)
	print(velocity)
	move_and_slide()
	
	#Jumping
	if Input.is_action_just_pressed("action") and (is_on_floor() or !$coyote_timer.is_stopped()):
		velocity.y = -200
	if !is_on_floor() and !climbing:
		$AnimatedSprite2D.play("jump")
		velocity.y += 750 * delta
2

Hi,

get_vector will return a direction that will be diagonal if pressing both a horizontal and vertical input. A diagonal direction will have a smaller length on the x axis than a purely horizontal vector.
Let me show you my Paint skills to demonstrate this:

image
image933×363 3.61 KB

On the left side, the input is right only. On the right side, the input is both right and up. Both vectors (red arrows) are the same length, however, their x value is different, and that’s exactly what is happening here (at least that’s what I think).

To fix this, you can just use the get_axis method to calculate horizontal and vertical axis separately.

Let me know if that helps.

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