Double Jump Height isn't constant

[theplayerrolo]

Godot Version

4.3

Question

I tried adding a double jump, however the amount of height gained from the double jump changes depending on the time you jump. How do I fix this?
Code:

extends CharacterBody2D
@export var speed = 500
@export var gravity = 100
var Double_Jump = false
@onready var Tim = get_node("Timer")
func _physics_process(delta: float) -> void:
	var input_dir = Input.get_axis("Left","Right")
	if is_on_floor():
		Double_Jump = false
	if not is_on_floor():
		velocity.y -= gravity
		if Double_Jump == true && Input.is_action_just_pressed("Jump"):
			print("yay")
			velocity.y += -200
	else:
		if Input.is_action_pressed("Jump"):
			velocity.y += -400
			Tim.start()
	velocity.x = input_dir * speed
	move_and_slide()


func _on_timer_timeout() -> void:
	print("done")
	Double_Jump = true

[parth.pc.1804]

The problem seems to be that double jump velocity is added to the original vertical velocity. Thus, when original velocity is maximum, more velocity is added to it, making a really high jump. But when original velocity is very less, adding velocity to it makes little difference to the net velocity.

So, in short, your net velocity depends on your original velocity before double jumping, which is constantly varying due to gravity. Since original velocity is always varying, net velocity is always varying, therefore, height is also varying.

To fix this instead of adding velocity to the original velocity, you can assign a specific value to velocity.y while double jumping.

TL;DR:
Change this code:

		if Double_Jump == true && Input.is_action_just_pressed("Jump"):
			print("yay")
			velocity.y += -200

To this code

		if Double_Jump == true && Input.is_action_just_pressed("Jump"):
			print("yay")
			velocity.y = -20 #Change this number according to your needs

[theplayerrolo]

thanks!