Pong AI not working as expected

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Jemsurfer

I'm writing a pong clone, that has an AI:
move_and_slide(Vector2(0, ball_vs_ai_position()) * speed)
where ball_vs_ai_position is:

func ball_vs_ai_position():
	if abs(ball.position.y - position.y) > 25:
		if ball.position.y > position.y:
			return 1
		else:
			return -1
	else:
		return 0

This should make the bat move if it's more than 25 pixels away from the y position of the ball.
If the ball is under the y position of the ball move up, and vice versa.
But, it does this.
The AI is on the right bat.
Can someone explain what I'm doing wrong?
Thanks in advance 🙂

pkowal1982

Hard to say without knowing tree structure and where the script is attached.
If you could upload your project I can have a look into it.
If not, try at least to use global_position instead of position.

Jemsurfer

Hi, here's a link to the project: https://gitlab.com/jemsurfer/TePoDoku
Sorry for taking so long to reply, and thanks for the quick reply :p

Kojack

Found it.
Your paddles have their main node off the top of the screen, then offset their sprite and collision shape by 400 pixels down (and 900 across for the right one). The ball has its node in the middle of the screen with 0,0 offset for its sprite and collision.

I set the paddle sprite and collision to 0,0 transform and moved the BatLeft and BatRight nodes down onto the game area and the AI works now.

pkowal1982

As Kojack said just set position of Pong/Bats/BatRight children to 0, 0 and then move whole pad to proper position. 🙂