how to make area2d keep scanning for collision

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Newby

Example i make an area that keeps damaging the player as long he is in it how do i do that do i need a for or while loop for it

:bust_in_silhouette: Reply From: SingingApple

I don’t know how you can do that using a for/while loop but I think timers should work.
In the player script,

timer = null
health = 1000

func health_decrement():
    health -= 50 # Amount to decrement from health in 0.25 secs

func _ready():
    timer =
    timer.set_wait_time(0.25) # 0.25 is just an example. 
    timer.connect("timeout", self, "health_decrement")

In the area2d script,

timer = get_node("player/timer")

func on_area_body_enter(body):

func on_area_body_exit(body):

This should work!

Another option:

On fixed/physics process check for overlapping bodies and apply your damage there (this means constant overlapping body checks).

And you do not need a loop, the game loop does that for you.

eons | 2018-02-09 09:50

@eons I agree.

SingingApple | 2018-02-09 10:25

can you give an example pls

Newby | 2018-02-09 13:20

:bust_in_silhouette: Reply From: Footurist

I would follow the advice of eons.

Here’s an example on how to do that in code:

func _physics_process(delta): # get's called every physics step
	 if Area2D.overlaps_body(PhysicsBody2D): # returns bool true/false

if you’re writing that code in the Area2D node, you won’t need to call the function explicitly on the object (as in like with other languages).

I was considering this while writing my answer. I am still kind of a noob in Godot but have you considered frame-rates. Won’t devices with higher frame-rates ‘damage_player()’ quicker than other devices? Or will it not?

SingingApple | 2018-02-12 18:07

You can suffer the fate of some AAA games at different framerates if using regular process, physics process is usually locked at 60 fps, but yes, a safe option could be to do damage_player(raw_damage_per_second/delta).

eons | 2018-02-13 16:55

@eons Got it! Thanks!

SingingApple | 2018-02-14 08:21