Friction

Part of the Input and Movement section of Coddy's Godot journey. Lesson 19 of 28.

Most game characters stop faster than they start. The slowing down when no key is held is friction.

To use a different number for stopping, the code needs two paths. else gives an if a second path, and exactly one of the two runs:

if direction == 0:
	velocity.x = move_toward(velocity.x, 0, friction * delta)
else:
	velocity.x = move_toward(velocity.x, direction * speed, acceleration * delta)

== checks whether two values are equal. One = sets a variable. direction == 0 is true when no key is held.

A small friction, like 300, slides like ice. A big one, like 2400, stops in a few frames.

Challenge

Medium

Make the hero stop quickly. With no key held, slow velocity.x to 0 by friction * delta per frame. With a key held, keep speeding up by acceleration.

Try it yourself

extends CharacterBody2D

var speed = 220
var acceleration = 900
var friction = 2400
var gravity = 1000
var jump_velocity = -500

func _physics_process(delta):
	velocity.y += gravity * delta
	if Input.is_action_just_pressed("jump") and is_on_floor():
		velocity.y = jump_velocity
	var direction = Input.get_axis("move_left", "move_right")
	velocity.x = move_toward(velocity.x, direction * speed, acceleration * delta)
	move_and_slide()