Add force from touch position to the center of the object

Questions & Answers
1

So I’m making this game cloning the facebook football mobile game. I could barely make the ball bounce whenever I touch it, but I couldn’t figure a way to make it go left and right if you touch the ball from the opposite direction. I was thinking like the post suggests about a way to apply a force from the position touched to the position of the ball.

using UnityEngine;
using System.Collections;

public class Touch : MonoBehaviour {


	// Update is called once per frame
	void Update () 
	{

		if (Input.GetMouseButtonDown (0)) 
		{
			Debug.Log ("Clicked");
			Vector2 pos = new Vector2 (Input.mousePosition.x, Input.mousePosition.y);
			RaycastHit2D hitInfo = Physics2D.Raycast (Camera.main.ScreenToWorldPoint (pos), Vector2.zero);
			// RaycastHit2D can be either true or null, but has an implicit conversion to bool, so we can use it like this
			if (hitInfo) 
			{
				Debug.Log (hitInfo.transform.gameObject.name);
				// Here you can check hitInfo to see which collider has been hit, and act appropriately.
				hitInfo.rigidbody.AddForce(new Vector2( 0, 300));
			}
		}
	}
}
2

This should do what you explained if I understood you well. It shows how to get a direction from 2 Vectors so hopefully you’ll find it useful. Code should be placed on the ball. In inspector settings for rigidbody2d set Linear drag higher then 0 (otherwise it will keep going forever) if it is a top down game Gravity to 0.

	Rigidbody2D rb;
	public float strenght = 100;

	// Use this for initialization
	void Start () 
	{
		rb = GetComponent<Rigidbody2D>();
	}
	
	// Update is called once per frame
	void Update () 
	{

		if (Input.GetMouseButtonDown(0)) 
		{
			Vector2 forceOrigin = Camera.main.ScreenToWorldPoint (Input.mousePosition);
			Vector2 ballPos = transform.position; //ball transform
			Vector2 direction = Vector3.Normalize (ballPos - forceOrigin); //Get Vector direction
			
			rb.AddForce (direction * strenght);
		}

	}