Touch Controls without virtual joystick

Hello Everyone,

I am new to developing game and have figured out various ways to make a virtual joystick through various youtube videos. Now i want to make a object(rigidbody) move horizontally wit$$anonymous$$n certain limits without using virtual joystick only drag touches. Eg. # = Object | | Scope of moving that object

 Position A  *|_#___________________________| Position B

Now i want to move the object horizontally through from position A to B using drag touch and not virtual joystick so can anyone give me the code for it and make me understand how it works ?

Thanks a lot !