Finding an objects position from one canvas to the other

Questions & Answers
1

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

2

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!