How can i draw a circle around the mouse pointer on scene view?

Unity Engine
1

I want to be able to draw a circle around the mouse position when doing things on the Scene View.
I’m having trouble finding a solution to that because from what i’ve been searching, to draw gizmos or handles i need them to derive from a Monobehavior, but i don’t want to have to have an object on the scene to do this.
Is there a different way to go about this?

2

Not sure why SceneView is not documented. But you should be able to subscribe to the draw event like this:

static class SceneDrawer {

    [InitializeOnLoadMethod]
    static Init() {

        SceneView.onSceneGUIDelegate -= DrawHandles;
        SceneView.onSceneGUIDelegate += DrawHandles;
    }

    static void DrawHandles(SceneView sceneView) {
    }
}

Getting the mouse position here might be as simple as Event.current.mousePosition. Not sure though

3

To complete previous post, I have something like that for my tools:

public static class SceneDrawer 
{
    [InitializeOnLoadMethod]
    static Init() 
    {
        SceneView.onSceneGUIDelegate -= OnSceneGUI;
        SceneView.onSceneGUIDelegate += OnSceneGUI;
    }

    private static void OnSceneGUI(SceneView sceneView)
    {
        Handles.BeginGUI();
        {
            if (EditorWindow.mouseOverWindow is SceneView)
            {
                if (Event.current.type == EventType.Repaint)
                {
                    DrawCircleBrush(Color.white, 10f);
                }
            }
        }
        Handles.EndGUI();
    }

    private static void DrawCircleBrush(Color _color, float _size)
    {
        Handles.color = _color;
        // Circle
        Handles.CircleHandleCap(0, Event.current.mousePosition, Quaternion.identity, _size, EventType.Repaint);
        // Cross Center
        Handles.DrawLine(Event.current.mousePosition + Vector2.left, Event.current.mousePosition + Vector2.right);
        Handles.DrawLine(Event.current.mousePosition + Vector2.up, Event.current.mousePosition + Vector2.down);
    }
}
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