Rotate an arrow object based on addedForce

Questions & Answers
1

Hi guys,

I’m adding force to a Rigidbody2D (ball) using the below lines of code

public class ThrowBall : MonoBehaviour {

	public int speed;
	Vector2 direction = new Vector2(1f,1f);
	
	void throwBall(int speed, Vector3 direction){
	
		GetComponent<Rigidbody2D>().AddRelativeForce(direction*speed); 

	}

}

How to get the angle in which this gameObject(ball) moves so that I can set the rotation of an arrow object to indicate the direction in which the ball is moving?

2

You can get the angle in which your ball moves by simply calculating the angle between its velocity vector and the x axis (since you are in 2D). In Unity terms, this gives us:

float angle = Vector3.Angle(GetComponent<Rigidbody2D>().velocity, Vector2.right);

If you want the angle to be dependent on the direction (left or right) of the ball and keep it under 90 degrees, you can use tranform.right instead:

float angle = Vector3.Angle(GetComponent<Rigidbody2D>().velocity, transform.right);

Let me know if you have more questions.