(Answered) How to get on-screen coordinates of object?

[linuxgurugamer]

I need to get the on-screen x,y coordinates of an object.  Right now it's a toolbar button, but later other stuff.

So for now, talking about ApplicationLauncherButton, I get the button when it's clicked.  But so far, I haven't been able to find anything (transforms, etc) which are remotely close to what the onscreen location is.  I know the approximate onscreen location from the mouse, I can get the mouse location using Input.mousePosition, and the Vector3 which is returned gives the x,y location.

I've tried using the following, with no success:

• button.sprite.transform.position
• button.position
• button.GetAnchor()
• button.GetAnchorTopRight()
• button.GetAnchorUL()
• button.GetAnchorUR()

 

button.transform.position doesn't give anything close.

Suggestions?

 

Edited December 4, 2016 by linuxgurugamer

[Thomas P.]

https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html

Would be my suggestion.

[linuxgurugamer]

2 hours ago, Thomas P. said:

https://docs.unity3d.com/ScriptReference/Camera.WorldToScreenPoint.html

Would be my suggestion.

Looked promising, but no go.

So, I use the following code to get the correct camera:

Camera cam;

if (HighLogic.LoadedSceneIsEditor)
    cam = EditorLogic.fetch.editorCamera;
else if (HighLogic.LoadedSceneIsFlight)
    cam = FlightCamera.fetch.mainCamera;
else
    cam = Camera.main;

and then this:

 Vector3 screenPos = camera.WorldToScreenPoint(button.transform.position);
 Debug.Log("target location is " + screenPos.x.ToString() + ", " + screenPos.y.ToString());

var mouse = Input.mousePosition;
Debug.Log("mouse  position: " + mouse.x.ToString() + ", " + mouse.y.ToString() + ", " + mouse.z.ToString());

button is set when I add the button to the app toolbar.

and the values I get are nowhere near what the mouse position is:

mouse  position: 1477, 25, 0
location is 313.2482, -684.1502

The mouse is on top of the button when I click it, and at that moment I get the coordinates

[James Kerman]

I don't know much (anything) about KSP modding but ScanSat scanners display co-ordinates on the maps.

[linuxgurugamer]

So I got the answer finally, at least for the GUI elements.  The following is getting me the correct information:

camera = UIMasterController.Instance.appCanvas.worldCamera;
Vector3 screenPos = camera.WorldToScreenPoint(button.transform.position);

 

[DMagic]

That works for any transform, the key is finding the right camera. For a part it would be the flight or editor camera depending on the scene, for a map node it would be the planetarium camera, and, as you found out, for most UI elements you can get the camera from the relevant canvas.