Draw Line on mouse move and detect line collision in Unity 2D and Unity 3D -

I used the code for line collison from http://www.theappguruz.com/tutorial/draw-line-mouse-move-detect-line-collision-unity2d-unity3d/ and it's working all right. It detects when line collides with itself,but I need to check collison with other objects(lets say a platform).I added this function in script:

 private bool isLineCollidedWithOtherObject()
 {
 RaycastHit hit;
 Ray ray = Camera.main.ScreenPointToRay(Camera.main.WorldToScreenPoint(pointsList[pointsList.Count-1]));
 if(Physics.Raycast(ray,out hit))
 {
 if(hit.collider)
 return true;
 }
 return false;
 }

and also added while checking for collision

 if(isLineCollide() && isLineCollidedWithOtherObject())

But it's not working.I added Box2dcollider to platform(Player).Someone please help.