New UI Drag Event

Questions & Answers
1

I need to drag a new UI Image object on the screen. The Image lives in a canvas. The canvas has a canvas scaler on it so it will work on different resolutions.

I have added an EventTrigger to the image object. In my custom script I have a method called OnDrag (BaseEventData eventData). I then cast that to a PointerEventData.

I use the PointerEventData.delta and add that to my RectTransform anchoredPosition value.

This moves my image object, but the scaling is off. In the editor it is not enough, so I multiply the delta by 1.8 and this seems to make it just right.

When I built for Android, however, the delta was too much and the image went too far as I dragged it.

So my question is how do I properly use the PointerEventData on different devices so that it will move the Image object the correct amount?

2

are you using [canvas scaler - scale with screen size]?

_scaler = GetComponentInParent<CanvasScaler>();
...
if (_scaler != null)
    Drag(e.delta.x * _scaler.referenceResolution.x / Screen.width);
else
    Drag(e.delta.x);