Convert Input.mousePosition to RectTransform pivot position

Questions & Answers
1

Hi there,

I am trying to convert my Input.mousePosition into the normalized Pivot position of some of my RectTransform but I don’t know how to do it.
Any idea ?

Thanks a lot !

2

You can use RectTransformUtility.ScreenPointToLocalPointInRectangle to get the point inside your rectangle. I suppose you then could use your rectTransfrom.rect to calculate the normalized position using Rect.PointToNormalized. I say this out of my memory :stuck_out_tongue: so not 100% sure. Please tell me whether this actually works or not, if it doesn’t, i’ll check and come up with a better answer :smiley:

3

Hey, I’ve been trying to make this work in overlay mode too. I realized the original answer only works for a in Screen Space - Camera. Here is the solution that should work in any case:

public Vector2 ScreenToRectPos(Vector2 screen_pos)
{ 
	if (canvas.renderMode != RenderMode.ScreenSpaceOverlay && canvas.worldCamera != null)
	{
		//Canvas is in Camera mode
		Vector2 anchorPos;
		RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, screen_pos, canvas.worldCamera, out anchorPos);
		return anchorPos;
	}
	else
	{
		//Canvas is in Overlay mode
		Vector2 anchorPos= screen_pos - new Vector2(rectTransform.position.x, rectTransform.position.y);
		anchorPos= new Vector2(anchorPos.x / rectTransform.lossyScale.x, anchorPos.y / rectTransform.lossyScale.y);
		return anchorPos;
	}
}

You can then normalize it if needed:

Vector2 normalizedPoint = Rect.PointToNormalized(rectTransform.rect, anchor_pos);