Pool Game

Aim.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Aim : MonoBehaviour
{

    Vector3 mousePos;
    public GameObject whiteBall;
    public float dist;//white ball to mouse pos

    void Update()
    {
        mousePos = Camera.main.ScreenToWorldPoint(Input.mousePosition) + new Vector3(0,0,10);
        transform.position = mousePos;

        transform.up = (transform.position - whiteBall.transform.position);

        dist = Vector2.Distance(mousePos, whiteBall.transform.position)/10;
        transform.localScale = new Vector3(0.1f, dist, 1);
    }


    public Vector2 GetDirection()
    {
        return (transform.position - whiteBall.transform.position);
    }

}

Hole.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Hole : MonoBehaviour
{

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.tag == "Ball")
        {
            if (collision.name == "white ball")
            {
                collision.GetComponent<WhiteBall>().Reset();
            }
            else
            {
                collision.gameObject.SetActive(false);
            }

        }
    }



}

WhiteBall.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class WhiteBall : MonoBehaviour
{

    public GameObject aim;
    public bool isReadyShoot = false;
    Vector2 shootingDir;
    Vector2 originalPos;

    private void Start()
    {
        originalPos = transform.position;
    }


    public void Reset()
    {
        GetComponent<Rigidbody2D>().velocity = Vector2.zero;
        transform.position = originalPos;
    }


    private void OnMouseDown()
    {
        aim.GetComponent<SpriteRenderer>().color = new Color(1, 1, 1, 1);//show aim
        isReadyShoot = true;
    }


    void Update()
    {      
        if (Input.GetMouseButtonUp(0)){

            if (isReadyShoot == true)
            {
                aim.GetComponent<SpriteRenderer>().color = new Color(1, 1, 1, 0);//hide aim
                isReadyShoot = false;
                shootingDir = aim.GetComponent<Aim>().GetDirection();
                GetComponent<Rigidbody2D>().AddForce(shootingDir * 200f);
            }
            
        }
    }
    
}