How to create a script for dynamic 2d sprite object that is controlled by 2 vector points?

Questions & Answers
1

HI, I need help with a script that is run in the update function that is able to control the length , position and rotation of the line (gameobject) that is controlled by 2 points.
Basically I have 3 gameobjects tow represent points in 2d and a third one that acts like a line between the points in 2D. I have the algorithm for position

line.transform.position = (point1 + point2) / 2f;

I need algorithm for rotation and scale.
I dont want to mess with the z axis for rotation as it would complicate my scene .

2

For the scale, if your line object has a nominal length of 1 on X, you can already scale x by the distance between the two points.

For the rotation, you could use LookAt methods, but math is so much more fun :slight_smile:

Here goes :

using UnityEngine;
using System.Collections;

public class LineTransforms : MonoBehaviour
{
	public Transform pointA;
	public Transform pointB;

	private Vector3 scale;
	private Quaternion rotation;

	void Start ()
	{
		scale = transform.localScale;
	}

	void Update ()
	{
		scale.x = Vector2.Distance(pointA.position, pointB.position);
		transform.localScale = scale;

		float angle = Mathf.Atan2(pointB.position.y - pointA.position.y, pointB.position.x - pointA.position.x);
		rotation = Quaternion.Euler(0, 0, angle*Mathf.Rad2Deg);
		transform.rotation = rotation;

		transform.position = (pointA.position + pointB.position)/2f;
	}
}