Fire Bullets

Part of the Projects section of Coddy's Godot journey. Lesson 14 of 36.

E or Enter (the action key) fires a bullet. A bullet is a scene, bullet.tscn. Its own script flies it forward and removes it after 0.8 seconds. The ship makes one at its nose, points it the same way and adds it to the game:

if Input.is_action_just_pressed("action"):
	var bullet = BULLET.instantiate()
	bullet.position = position + Vector2.UP.rotated(rotation) * 18
	bullet.rotation = rotation
	get_parent().add_child(bullet)

Add the bullet to the ship's parent. A child moves and turns with its parent, so a bullet on the ship would swing with it.

is_action_just_pressed is true only on the frame the key goes down. Each press fires one bullet.

Challenge

Medium

Fire a bullet with E.

Add const BULLET = preload("res://bullet.tscn").
When action is just pressed, make a bullet 18 pixels in front of the ship, with the ship's rotation.
Add it to the ship's parent with get_parent().add_child(bullet).

Press Play and press E: a bullet flies from the nose. Then Check.

Try it yourself

extends CharacterBody2D

const TURN_SPEED = 4.0
const THRUST = 300

func _physics_process(delta):
	rotation += Input.get_axis("move_left", "move_right") * TURN_SPEED * delta
	if Input.is_action_pressed("move_up"):
		velocity += Vector2.UP.rotated(rotation) * THRUST * delta
	$Flame.visible = Input.is_action_pressed("move_up")
	position += velocity * delta
	if position.x < 0:
		position.x += 640
	if position.x > 640:
		position.x -= 640
	if position.y < 0:
		position.y += 360
	if position.y > 360:
		position.y -= 360