Touch.position, Touch.deltaPosition, Screen.width, Screen.Height

Question

From a very famous Unity plugin source code, there is a line a don't quite understand:

 var touchZero = Input.GetTouch(0);
 var touchZeroPrevPos = touchZero.position - new Vector2(touchZero.deltaPosition.x / Screen.width, touchZero.deltaPosition.y / Screen.height);

what is purpose of touchZero.deltaPosition.x / Screen.width? Could Touch.position and Touch.deltaPosition have the same unit (pixel) ? Why not just touchZero.position - touchZero.deltaPosition?

Answer 1

Answer by Cuttlas-U · Apr 16, 2017 at 07:57 PM

hi; thats because the width change over diffecrent resloutions and platforms and u have to get the right thouch input from it;

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Touch.position, Touch.deltaPosition, Screen.width, Screen.Height

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