Projectile Attacks?

flame-cube

So I'm working on a game, and the player has certain moves, one of them being a move where they can throw a fireball. I couldn't find a way to instance the projectile where the player is and then launch it. I already have a way to detect the collisions with enemies, all I need is a way to launch the projectile. If it helps, I have an export variable that shows where the player is facing

TwistedTwigleg

How does your fireball move? That will help shape the solution you may need.

If you have the directions up, down, left, and right, then you could do something like this to get a vector from the direction:

var fireball_direction = Vector2.ZERO
if (direction == "up"):
	fireball_direction = Vector2.UP
elif (direction == "down"):
	fireball_direction = Vector2.DOWN
elif (direction == "left"):
	fireball_direction = Vector2.LEFT
else:
	fireball_direction = Vector2.RIGHT

# spawn the fireball at that direction (example)
# (I am assuming this script is on the player node)
var clone = FIREBALL_SCENE.instance()
get_parent().add_child(clone)
# (100 = the radius offset from the center of the player)
clone.global_position = global_position + (direction * 100)
# (tell the fireball which direction it is facing)
clone.fireball_direction = fireball_direction

If you use something like the code above, you could then move the fireball manually by changing the position of the Node2D, assuming you are not using a physics node like RigidBody2D:

extends Node2D
var fireball_direction = Vector2.UP
export (float) var fire_move_speed = 100.0

func _process(delta):
	global_position += fireball_direction * fire_move_speed

If you are using a RigidBody2D or similar though, you will likely want to instead change the velocity of the RigidBody2D to get the movement instead so it can interact with the physics world.

flame-cube

Now when I press the shoot button, this happens The fireball teleports forwards and backwards before disappearing. Code on player

func shoot():
	var fireball_direction = Vector2.ZERO
	if (direction == "up"):
		fireball_direction = Vector2.UP
	elif (direction == "down"):
		fireball_direction = Vector2.DOWN
	elif (direction == "left"):
		fireball_direction = Vector2.LEFT
	else:
		fireball_direction = Vector2.RIGHT
	var clone = FIREBALL_SCENE.instance()
	get_parent().add_child(clone)
	clone.global_position = global_position
	clone.fireball_direction = fireball_direction

Code on fireball Because it was originally a KinematicBody2D, I parented it to a Node2D NODE2D SCRIPT:

extends Node2D
var fireball_direction = Vector2.DOWN
export (float) var fire_move_speed = 100.0
func _process(delta):
	global_position += fireball_direction * fire_move_speed

KINEMATIC BODY SCRIPT: (not sure if this is relevant but showing it anyway just in case)

extends KinematicBody2D
var velocity = Vector2.ZERO
func _process(delta):
	velocity = move_and_slide(velocity)
	for i in range(get_slide_count()):
		var collision = get_slide_collision(i)
		if collision:
			queue_free()

TwistedTwigleg

Super sorry for the late reply, things got in the way when I first saw the reply and then I completely spaced it and the post got buried!

If the Fireball has a KinematicBody2D and is using velocity, then what I would recommend doing is simply setting the velocity of the KinematicBody2D so it points in the direction the fireball needs to go. So for the Node2D script, you could do something like this:

# Code for player
# ====
# after line 14, add the following:
clone.setup_fireball()
# ====

# Code for Node2D script
# ====
extends Node2D
var fireball_direction = Vector2.DOWN
export (float) var fire_move_speed = 100.0
func setup_fireball():
	var kinematic_body = get_node("KinematicBody2D")
	kinematic_body.velocity = fireball_direction * fire_move_speed
# _process not needed anymore, as the KinematicBody2D will handle moving the fireball
# ====

# Code for Kinematic Body can stay the same, it should work

For the teleporting backwards and then disappearing, it may be that left/right need to be swapped. So lines 8 and 10 in the player code for spawning the fireball may need to be adjusted. What you could try doing is adding something like this after 10 in the player code:

print ("Direction: ", direction, " | Vector: ", fireball_direction)

Which should print which direction the player is facing and which vector it is assigning it to. Then you can see if the left/right are incorrectly set and swap them as needed.

Another thing that could, maybe, be causing the teleportation is spawning the fireball right inside the player. If the player and the fireball both have collision scripts, it could be that the physics engine is pushing it out and that is causing the issue. What I would recommend doing is adjusting the code for the setting the global position slightly so there is a small offset:

# From this
clone.global_position = global_position
# To something like this (move it 10 pixels in the direction the player is shooting towards
clone.global_position = global_position + (fireball_direction * 10)