iOS -Touch position unchanged, deltaPosition reported

Questions & Answers
1

I am experiencing a problem with the positioning of multi touches. In two consecutive calls to Update, the actual position on both axis remained the same for a particular touch, however a non-zero value was reported in the deltaPosition for that axis. Am I attempting to read deltaPositions for touch phases that don’t support them perhaps?

My code and debug follows:

Code

void Update (){
    foreach (Touch touch in Input.touches) {

        if (touch.phase == TouchPhase.Stationary){
            continue;
        }

        if (touch.phase != TouchPhase.Began){
            float previousX = touch.position.x - touch.deltaPosition.x;
            float previousY = touch.position.y - touch.deltaPosition.y;

            Debug.Log("Touch No:" + touch.fingerId);
            Debug.Log("Touch PosX:" + touch.position.x + " - Delta PosX:" + touch.deltaPosition.x + " = " + previousX + " ||| Touch PosY:" + touch.position.y + " - Delta PosY:" + touch.deltaPosition.y + " = " + previousY);
        }
    }
}

Below is the debug that is output from the above code.

Touch No:0

Touch PosX:1272 - Delta PosX:12 = 1260 ||| Touch PosY:227 - Delta PosY:30 = 197

Touch No:1

Touch PosX:1264 - Delta PosX:19 = 1245 ||| Touch PosY:365 - Delta PosY:-99 = 464

Touch No:0

Touch PosX:1267 - Delta PosX:-5 = 1272 ||| Touch PosY:291 - Delta PosY:64.00003 = 227

Touch No:1

Touch PosX:1264 - Delta PosX:2 = 1262 ||| Touch PosY:365 - Delta PosY:-5.000061 = 370