Unity Pixel coordinate/ Delta position
https://www.programmersought.com/article/1468596082/
Coordinate system classification
1. Physics Engine Coordinate System / World Coordinate System
2. Screen coordinate system
The screen coordinate system is like this, the x value in the upper right corner is the largest, the y value is the largest, and the lower left corner x and y are both 0. The value is the screen pixel size
Touch.deltaPosition issues - Unity Forum
float value = touch.deltaTime > 0 ? touch.deltaPosition.x / Screen.width / touch.deltaTime : 0;
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