Touch.deltaPosition Question

[phoolish_one]

Hello Everyone,

I am trying to learn about Touch.deltaPosition via the Unity documentation at Unity - Scripting API: Touch.deltaPosition. The first code example has a line of code that I don’t understand. The line is:
transform.Translate(-touchDeltaPosition.x * speed, -touchDeltaPosition.y * speed, 0); The part I don’t understand is the negative signs. It seems like that would always move the object from right to left regardless of the actual swipe direction. Why are they there?

[mikael_juhala]

Not sure where you found the example, but I guess the intention is to move the object into the opposite direction compared to the touch.

For example: If the touch moves left, delta being [-1, 0], then -delta is [1, 0], thus moving the transform to the right. And if the touch moves right, delta being [1, 0], then -delta is [-1, 0], which moves the transform to the left.

[phoolish_one]

@mikael_juhala

Not sure where you found the example, but I guess the intention is to move the object into the opposite direction compared to the touch.

For example: If the touch moves left, delta being [-1, 0], then -delta is [1, 0], thus moving the transform to the right. And if the touch moves right, delta being [1, 0], then -delta is [-1, 0], which moves the transform to the left.

Thank you! That makes sense.