Kinematic Body 2D not moving

Question

I'm trying to game a game using the Godot Engine but I'm stuck at the beginning! I can't make my KinematicBody2D move!

This is my Player.GD script

extends KinematicBody2D

var velocity = Vector2.ZERO
var move_speed = 480
var gravity = 1200
var jump_force = -720
var right = Input.is_action_pressed("move_right")
var left = Input.is_action_pressed("move_left")
var jump = Input.is_action_pressed("jump")


func _ready():
    pass
    
func _physics_process(_delta):
    var move_direction = int(right) - int(left)
    velocity.x = move_speed * move_direction
    move_and_collide(velocity)

Can someone, please, help me?

Answer 1

All this code will run when the KinematicBody2D is initialized:

var velocity = Vector2.ZERO
var move_speed = 480
var gravity = 1200
var jump_force = -720
var right = Input.is_action_pressed("move_right")
var left = Input.is_action_pressed("move_left")
var jump = Input.is_action_pressed("jump")

In consequence, it will not be taking input in real time. Instead you want the last three lines here:

func _physics_process(_delta):
    var right = Input.is_action_pressed("move_right")
    var left = Input.is_action_pressed("move_left")
    var jump = Input.is_action_pressed("jump")
    # …

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Those are boolean, by the way. You can get a float from 0.0 to 1.0 if you use Input.get_action_strength instead. Which will also let your code ready for analog input.

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I also want to point out that move_and_collide does not take a velocity, but a displacement vector. So to call it correctly, you want to multiply the velocity by delta:

func _physics_process(delta):
    # …
    move_and_collide(velocity * delta)

Or use move_and_slide, which does take a velocity. By the way, the up parameter that move_and_slide takes is to discern between floor, ceiling, and walls. Without, everything is considered a wall.