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

[RequireComponent (typeof(BoxCollider2D))]
public class Draggable2D : MonoBehaviour {

    Vector2 startPos;
    Vector2 offset;

    private void OnMouseDown()
    {
        startPos = Camera.main.ScreenToWorldPoint(Input.mousePosition);
        offset = (Vector2)transform.position - startPos;
    }

    private void OnMouseDrag()
    {
        Vector2 p = Camera.main.ScreenToWorldPoint(Input.mousePosition);

        transform.position = p + offset;
    }
}