Movement issues

Help
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1

Godot Version

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Question

I’m working on a 3D boxing game and I’m using this code to get the boxer to move around

if (canMove):
		# Left Analog Stick
		var left_horz = Input.get_action_strength("left_stick_right") - Input.get_action_strength("left_stick_left")
		var left_vert = Input.get_action_strength("left_stick_up") - Input.get_action_strength("left_stick_down")
		
		
		
		var velocity = Vector2()
		left_horz = velocity.x += moveDir * movementSpeed
		left_vert = velocity.y += moveDir * movementSpeed
		velocity = move_and_slide(velocity)

But i got this error

Assignment is not allowed inside an expression

2

Your error is most likely here:

left_horz = velocity.x += moveDir * movementSpeed
left_vert = velocity.y += moveDir * movementSpeed

You are using += instead of +.

left_horz = velocity.x += moveDir * movementSpeed
is practically the same as:
left_horz = velocity.x = velocity.x + moveDir * movementSpeed

It assigns velocity.x and velocity.y inside of an expression, which you cannot do

1 Like
3

So, set velocity.x and y, after set your horizontal and vertical variable to their respective velocity.

4

Yes, that is most likely the correct way to do it.

5

Try using Input.get_vector for planar movement. This handles mapping four actions to each direction on each axis.

If your script extends a CharacterBody3D then velocity already exists, and you are improperly shadowing it. move_and_slide takes no arguments.

if canMove:
	var input_direction = Input.get_vector("left_stick_left", "left_stick_right", "left_stick_down", "left_stick_up")
	velocity = input_direction * movementSpeed

	move_and_slide()

The error you recieve is because += is an assignment, and so is left_horz = , you cannot use the two in tandem.