Direction based animations in 2D Platformer

Sieniukko

I'm using AnimationTree for my character and im trying make him shoot to the global mouse position. Shooting itself is working fine and animation for one direction is working, with simple code.

if Input.is_action_pressed ("Shoot"):
	state_machine.travel("shoot")

Im using guides from youtube

Then I add different animations for different directions like this

if Input.is_action_pressed ("Shoot"):
	if fire_direction <=30 and fire_direction >=-30:
		state_machine.travel("shoot")
	if fire_direction <=30 and fire_direction >=90:
		state_machine.travel("shoot45")
	if fire_direction <=-30 and fire_direction >=-90:
		state_machine.travel("shoot-45")

And it crashes "Invalid operands 'Nil' and 'Int' operator '<='"

What I found from the google it relates to mousepos not co-oping with something?

TwistedTwigleg

Based on the error, it seems that fire_direction is null at some point, which causes it to crash. A simple solution is to check to make sure fire_direction is not null before attempting to use it:

if Input.is_action_just_pressed("Shoot"):
	if (fire_direction != null):
		if fire_direction <=30 and fire_direction >=-30:
			state_machine.travel("shoot")
		if fire_direction <=30 and fire_direction >=90:
			state_machine.travel("shoot45")
		if fire_direction <=-30 and fire_direction >=-90:
			state_machine.travel("shoot-45")

Another thing you can do is initialize fire_direction so something like 0 in _ready, which should make it non-null though it will always fire towards 0 degrees until fire_direction is set.

Sieniukko

Thank you very much, that fixed the problem and now I can aim around(finally:D). As the one problem is solved, another appears. All the aiming directions are working properly except this one.

	1.	if fire_direction <=-150 and fire_direction >=150:
	2.		state_machine.travel("shoot")
	3.		$Sprite.flip_h = false

Feat world largest .gif

TwistedTwigleg

@Sieniukko said: Thank you very much, that fixed the problem and now I can aim around(finally:D). As the one problem is solved, another appears. All the aiming directions are working properly except this one.
	1.	if fire_direction <=-150 and fire_direction >=150:
	2.		state_machine.travel("shoot")
	3.		$Sprite.flip_h = false
Feat world largest .gif

Awesome! I'm glad that fixed the issue. :smile:

As for the problem, I think its because its impossible for both conditions to be true. If fire_direction is less than -150, it cannot be more than 150, so the condition will always return false. You may need to use an or or restructure the condition.

Sieniukko

		if fire_direction <=-150 and fire_direction >=-180:
			state_machine.travel("shoot")
			$Sprite.flip_h = false
		if fire_direction <=180 and fire_direction >=150:
			state_machine.travel("shoot")
			$Sprite.flip_h = false

This fixed it, thank you again.