WorldToScreenPoint, isn't getting it right?

Questions & Answers
1

Not sure what’s going on - but for some reason I can’t get WorldToScreenPoint to get me the right on-screen coordinates.

public void OnHover(bool isOver)
{
	var screen = Camera.main.WorldToScreenPoint(background.cachedTransform.position);
	Debug.Log("Slot: " + screen);
	Debug.Log("Mouse: " + Input.mousePosition);
}

See:

18306-todo.png
18306-todo.png790×597 454 KB

The background variable is a UISprite - with a TopLeft pivot point, so I should get the right coords.

18307-todo.png

I also tried using the UI camera (which is orthographic) with NGUITools.FindCameraForLayer(background.gameObject.layer); - Same results. I also tried localPosition.

Also tried this, just to see if I get a correct x coord - no avail:

var bounds = NGUIMath.CalculateAbsoluteWidgetBounds(background.cachedTransform);
Debug.Log("Bounds: " + Camera.main.WorldToScreenPoint(bounds.min));

Note that my screen is 1333x768 - Sometimes, if I hover over a slot that’s over to the right, I get numbers like 1444 for the x on-screen coords - which is higher than my screen’s overall width.

Note also that it’s only the width that’s not getting calculated right - the height is fine. I tried screen.x - Screen.width and Screen.width - screen.x both didn’t give me logical results (they shouldn’t but I was just experimenting)

What am I missing here, why am I not getting the right coords?

Thanks.

EDIT:
What I’m trying to do, is get the distance between the topleft corner of the slot, and the point where I click on the slot. So I figured I could do:

var screenPos = Camera.main.WorldToScreenPoint(background.transform.position);
var dist = Vector2(Input.mousePosition.x - screenPos.x, screenPos.y - Input.mousePosition.y);

This used to work in the past for some reason - now it’s not. Could it be a NGUI-related issue?

2

I’ve no NGUI experience at all, but for me it looks like your main camera is positioned on the left of NGUI camera, or that it is rotated counterclockwise around y axis.

Could you post positions and rotations of both cameras, as well as background.cachedTransform.position from your example?