Finding an objects position from one canvas to the other

Question

Hi, I need to position a button in runtime on a canvas at the same position of a different button from a different canvas. I have the both buttons references but I can't seem to solve it. Here is what I tried to do that doesn't work:

 //button1 and button2 are not in the same canvas. I want button2 to be on top of button1
 
 
 Vector3 button1Viewport = camera1.WorldToViewportPoint(button1.transform.position);
 
 Vector3 button2Position = gameObject.GetComponentInParent<Canvas>().worldCamera.ViewportToScreenPoint(button1Viewport);
 
 button2.transform.position = button2Position;

thanks

Answer 1

Hey! I've got a method for you that does just this:

 /// <summary>
     /// Converts the anchoredPosition of the first RectTransform to the second RectTransform,
     /// taking into consideration offset, anchors and pivot, and returns the new anchoredPosition
     /// </summary>
     public static Vector2 SwitchToRectTransform(RectTransform from, RectTransform to)
     {
         Vector2 localPoint;
         Vector2 fromPivotDerivedOffset = new Vector2(from.rect.width * 0.5f + from.rect.xMin, from.rect.height * 0.5f + from.rect.yMin);
         Vector2 screenP = RectTransformUtility.WorldToScreenPoint(null, from.position);
         screenP += fromPivotDerivedOffset;
         RectTransformUtility.ScreenPointToLocalPointInRectangle(to, screenP, null, out localPoint);
         Vector2 pivotDerivedOffset = new Vector2(to.rect.width * 0.5f + to.rect.xMin, to.rect.height * 0.5f + to.rect.yMin);
         return to.anchoredPosition + localPoint - pivotDerivedOffset;
     }

In your case, you better want to serialize your buttons as RectTransform and link them in editor. Then you need to call this like so:

 button2.anchoredPosition = SwitchToRectTransform(button1, button2);

Hope this helps!

Finding an objects position from one canvas to the other

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