Input.mousePosition and GUI.Window Issue

Unity Engine
1

Hello,

I’m having trouble making a GUI.Window appear where I clicked on the screen.

Here is what I’m doing right now:

Player clicks on a blue circle on the map, which instantiates a prefab. This prefab has a script with OnGUI that loads a GUI.Window. The only thing I’m using to position the window on the screen is Input.mousePosition.

Using the screen captures below the first image shows when I click on the blue circle it shows the position is x:283, y:322. The x is always correct but the Y is always below for this circle. For other circles on the map it also may appear above where clicked.

In the second screen capture if I drag the window to where I think it should appear it shows the new position of the window is x:283, y:145. The prefab game object that is instantiated is set to a position of 0,0,0 (if that matters).


Code I’m using on the blue circles to instantiate the prefab (abWindow is a public variable assigned to the prefab)

function OnMouseUp () {	
        Instantiate(abWindow, transform.position, transform.rotation);
}

In the prefab I’m using this code:

function Awake () {
	var screenPos : Vector3 = Input.mousePosition;		
	print("Screen Position:" + screenPos);		
	objectWindow = Rect(screenPos.x,screenPos.y, winWidth,200);		
}

function OnGUI () {		
	objectWindow = GUILayout.Window (windowid, objectWindow, handleWindow, "Selected Object");			
}

function handleWindow (windowID : int) {	
	GUILayout.Label("Window is at: " + objectWindow.x + " : " + objectWindow.y);
	
	if (GUI.Button(Rect(100, 150, 100, 25), "Close") ) {		
		Destroy(this.gameObject);
	}
        GUI.DragWindow();
}

Thanks for any help,
Brent

2

MousePosition.y is zero at the bottom, while GUI is zero at the top.

raaaaaage

To fix it, you just

raaaaaage
*ahem

To fix it, you just need to subtract the mouse position from Screen.Height when creating the window.

3

Thanks so much… that did it. I’m new to the forums so what is raaaage ?

4

That’s me being angry that mouseposition and gui are built upside-down of each other. I’ve dealt with the same problem in a few other languages, and while there’s usually a reason for it, it still seems like nonsense. And it usually takes me a half hour or so to remember that oh, right, I have to invert one of the vertical components. And it’s annoying. :slight_smile:

5

Ah, understood… thanks again

6

You have to excuse Vicenti. He’s a very passionate person. But he’s also an excellent programmer, and if he answers one of your posts, chances are that he solved your problem.

* cheers! *

hiccup
burp

:slight_smile:

7

You can simply use Event.current.mousePosition, then it isn’t upside-down. You should always use Event functions with OnGUI, never Input.

–Eric

8

Thanks for the Tip Eric I’ll keep that in mind. I’m only using mousePosition during Awake to get the initial click location not within OnGUI.

9

What’s wrong with this poor Input.mousePosition ?

10

As complained about above, the Y coordinates are inverted because they are in screen space coordinates. Event.current.mousePosition uses GUI space coordinates.

–Eric