Creating draggable hinge joint

Hello everyone.

I am using 2D mode of editor. I have createt two sprites: one long rectangle, second is short rectangle. I have attached to both of them BoxCollider2D’s and rigidbodies.

I have made square rigidbody kinematic. After that, I have added to rectangle Hinge joint and connected it with rigidbody of square.

So i have rectangle that is fixed at square and spins around it when other objects will hit it.

Question: How can I make this carousel controllable with touch and mouse, like if I start to drag it, it will rotate to position of my touch/mouse? Also when I release it, it will rotate with speed of my last swipe and start to slow down until it stops.

PS. Gravity is zero.

You can use the DragRigidBody2D script
Here is my version of the script

using UnityEngine;
using System.Collections;

public class DragRigidBody2D : MonoBehaviour
	public float distance = 0.2f;
	public float dampingRatio = 1;
	public float frequency = 1.8f;
	public float linearDrag = 1.0f;
	public float angularDrag = 5.0f;
	private SpringJoint2D springJoint;

	void Start ()
		if (!springJoint) {
			GameObject go = new GameObject ("Rigidbody2D Dragger");
			Rigidbody2D body = go.AddComponent ("Rigidbody2D") as Rigidbody2D;
			springJoint = go.AddComponent ("SpringJoint2D") as SpringJoint2D;

			body.isKinematic = true;
	// Update
	void Update ()
		if (!Input.GetMouseButtonDown (0))
		Camera mainCamera = FindCamera ();

		int mask = (1 << 8);	
		RaycastHit2D hit = Physics2D.Raycast (mainCamera.ScreenToWorldPoint (Input.mousePosition),, Mathf.Infinity, mask);

		// I have proxy collider objects (empty gameobjects with a 2D Collider) as a child of a 3D rigidbody - simulating collisions between 2D and 3D objects
		// I therefore set any 'touchable' object to layer 8 and use the layerMask above for all touchable items

		if (hit.rigidbody != null && hit.rigidbody.isKinematic == true) {

		if (hit.rigidbody != null && hit.rigidbody.isKinematic == false) {

			springJoint.transform.position = hit.point;
			springJoint.dampingRatio = dampingRatio;
			springJoint.frequency = frequency;
			springJoint.distance = distance;

			springJoint.connectedBody = hit.rigidbody;
			// maybe check if the 'fraction' is normalised. See
			StartCoroutine ("DragObject", hit.fraction);
		} // end of hit true condition
	} // end of update
	IEnumerator DragObject (float distance)
		float oldDrag = springJoint.connectedBody.drag;
		float oldAngularDrag = springJoint.connectedBody.angularDrag;
		springJoint.connectedBody.drag = linearDrag;
		springJoint.connectedBody.angularDrag = angularDrag;
		Camera mainCamera = FindCamera ();
		while (Input.GetMouseButton (0)) {
			Ray ray = mainCamera.ScreenPointToRay (Input.mousePosition);
			springJoint.transform.position = ray.GetPoint (distance);
			yield return null;
		if (springJoint.connectedBody) {    
			springJoint.connectedBody.drag = oldDrag;
			springJoint.connectedBody.angularDrag = oldAngularDrag;
			springJoint.connectedBody = null;
	Camera FindCamera ()
		if (camera)
			return camera;
			return Camera.main;