Smooth Drag and drop in Unity 3d [ Video ]

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This video will show you guys how do drag and drop an object in unity in a very simple with less amount of codes.

Codes used in the video above. You can copy and paste these codes ---

In C# :

using UnityEngine;
using System.Collections;

public class drag : MonoBehaviour {
    Vector3 dist;
    float posX;
    float posY;

  void OnMouseDown(){
      dist = Camera.main.WorldToScreenPoint(transform.position);
      posX = Input.mousePosition.x - dist.x;
      posY = Input.mousePosition.y - dist.y;

    }

  void OnMouseDrag(){
      Vector3 curPos = 
                new Vector3(Input.mousePosition.x - posX, 
                Input.mousePosition.y - posY, dist.z);  

      Vector3 worldPos = Camera.main.ScreenToWorldPoint(curPos);
      transform.position = worldPos;
    }
}

In Javascript :

#pragma strict
    private var dist : Vector3;
    private var posX : float;
    private var posY : float;

    function OnMouseDown(){
      dist = Camera.main.WorldToScreenPoint(transform.position);
      posX = Input.mousePosition.x - dist.x;
      posY = Input.mousePosition.y - dist.y;

    }

    function OnMouseDrag(){
      var curPos = new Vector3(Input.mousePosition.x - posX, 
                     Input.mousePosition.y - posY, dist.z);
               
      var worldPos = Camera.main.ScreenToWorldPoint(curPos);
      transform.position = worldPos;
    }

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