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Question by Personae · Jul 25, 2015 at 06:30 AM · movementmovetowards

How to know if 2D gameobject is moving left or right?

I have an enemy that is being moved using Vector2.MoveTowards and I want to know how determine if it's moving towards the negative or positive x-axis. I tried getting its velocity but it only seems to return a positive value.

Thanks, guys!

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Answer by Cynikal · Jul 25, 2015 at 06:46 AM

You could do something like...

Vector2 oldLocation; Vector2 newLocation;

oldLocation = newLocation; newLocation = gameObject.transform.blahblah;

Do some fancy math, to determine if it's negative..or positive.

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Answer by Maynk · Nov 30, 2020 at 04:28 AM

Check this link For Left or Right if going determin to gameObject


: https://forum.unity.com/threads/left-right-test-function.31420/

I hope you give Answer

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Answer by FeedMyKids1 · Nov 30, 2020 at 07:07 AM

Hi, to check which direction it's moving in in 2D, you'll check for changes to it's x transform.position value.

So in code it might look like:

 Vector2 posLastFrame;
 Vector2 posThisFrame;
 void Update()
 {
      posLastFrame = posThisFrame;
 
      posThisFrame = transform.position;
 
      CheckMoveDirection();
 }
 
 enum Direction { Right, Left, Still };
 Direction CheckMoveDirection()
 {
    if (posThisFrame.x > posLastFrame.x)
        return Direction.Right;
   if (posThisFrame.x < posLastFrame.x)
       return Direction.Left;
   else
      return Direction.Still;
 }
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