How to make sprites flip to player when player is in opposite direction?

Question

So, I have some zombies, which their default sprite is them looking left (Ignore the glitches):
https://gyazo.com/52006a1138ed076b3519d39d864de2aa

However, when I go to the left of the map, zombies are looking the other way:
https://gyazo.com/324329e639791740e274f21b421627b3

Here's the script to one of the zombies, they almost have the same script btw:

extends KinematicBody2D


const GRAVITY = 60

onready var zombie = self
var speed = 0.5
var velocity = Vector2()
onready var target = get_parent().get_node("Player")

export var ZombieSpeed = 1500

export var Smoothness = 0.2

func _ready():
    set_fixed_process(true)
    #self.add_collision_exception_with(Boundry)

func _fixed_process(delta):


    var direction = (target.get_global_pos() - zombie.get_global_pos()).normalized()
    velocity.y += GRAVITY
    #move(direction*speed*delta)

    var motion = velocity * speed * delta

    motion = move(motion)

    velocity.x = lerp(velocity.x, ZombieSpeed * direction.x, Smoothness)

    if (is_colliding()):
        var normal = get_collision_normal()
        motion = normal.slide(motion)
        velocity = normal.slide(velocity)
        var collider = get_collider()
        move(motion)

        if (collider.is_in_group("Bullet")):
            queue_free()
            print("Zombie3 Killed!")
        if (collider.is_in_group("AutoKill")):
            queue_free()
            print("Zombie3 Killed by Boundry!")

Answer 1

You can flip their sprite when their direction changes, like this:

var sprite = get_node("zombie_sprite")
sprite.set_scale(Vector2(sign(direction.x), 1))

Note 1: while it would work, you don't need to do this every frame in _process, only when the direction changes.

Note 2: don't scale the body, as it may have unwanted side-effects (as described here https://github.com/godotengine/godot/issues/12335)

Comments

That doesn't seem to work, it just sets the zombies in one position.

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Oh Oo but that code isn't setting the position of the zombie sprite at all. It really flips the sprite horizontally by setting a scale of -1 if direction is left, and a scale of 1 if direction is right. Isn't this what you wanted? Or did I miss something? What is your node structure?

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Like this; https://gyazo.com/f8d25b2b3f30da383e0bfbb577f7de99

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Ok, so is this doing the flip correctly?

var sprite = get_node("CollisionShape2D/PlayerSprite")
sprite.set_scale(Vector2(sign(direction.x), 1))

Another advice:
Don't place your sprite under the collision shape. The reason is, collision shapes no longer exist when the game is exported. It also creates a parent/child relationship that you could easily get rid of. So instead, you could have this hierarchy:

- Zombie
    - CollisionShape2D
    - PlayerSprite
        - Hands