UnityEditor.RectHandles.RotationSlider C# (CSharp) Method

        public static float RotationSlider(int id, Vector3 cornerPos, float rotation, Vector3 pivot, Vector3 handleDir, Vector3 outwardsDir1, Vector3 outwardsDir2, float handleSize, Handles.CapFunction drawFunc, Vector2 snap)
        {
            Vector3 vector = outwardsDir1 + outwardsDir2;
            Vector2 vector2 = HandleUtility.WorldToGUIPoint(cornerPos);
            Vector2 vector3 = HandleUtility.WorldToGUIPoint(cornerPos + vector) - vector2;
            vector3 = (Vector2) (vector3.normalized * 15f);
            RaycastGUIPointToWorldHit(vector2 + vector3, new Plane(handleDir, cornerPos), out cornerPos);
            Event current = Event.current;
            Vector3 vector4 = Handles.Slider2D(id, cornerPos, handleDir, outwardsDir1, outwardsDir2, handleSize, drawFunc, Vector2.zero);
            if (current.type == EventType.MouseMove)
            {
                DetectCursorChange(id);
            }
            if ((current.type == EventType.Repaint) && (((HandleUtility.nearestControl == id) && (GUIUtility.hotControl == 0)) || (GUIUtility.hotControl == id)))
            {
                Rect position = new Rect(current.mousePosition.x - 100f, current.mousePosition.y - 100f, 200f, 200f);
                EditorGUIUtility.AddCursorRect(position, MouseCursor.RotateArrow);
            }
            return (rotation - AngleAroundAxis(vector4 - pivot, cornerPos - pivot, handleDir));
        }

        static Quaternion RotationHandlesGUI(Rect rect, Vector3 pivot, Quaternion rotation)
        {
            Vector3 euler = rotation.eulerAngles;

            // Loop through the 4 corner handles
            for (int xHandle = 0; xHandle <= 2; xHandle += 2)
            {
                for (int yHandle = 0; yHandle <= 2; yHandle += 2)
                {
                    Vector3 curPos = GetRectPointInWorld(rect, pivot, rotation, xHandle, yHandle);

                    float size = 0.05f * HandleUtility.GetHandleSize(curPos);
                    int   id   = GUIUtility.GetControlID(s_RotationHandlesHash, FocusType.Passive);
                    if (GUI.color.a > 0 || GUIUtility.hotControl == id)
                    {
                        EditorGUI.BeginChangeCheck();
                        Vector3 outwardsA = rotation * Vector3.right * (xHandle - 1);
                        Vector3 outwardsB = rotation * Vector3.up * (yHandle - 1);
                        float   angle     = RectHandles.RotationSlider(id, curPos, euler.z, pivot, rotation * Vector3.forward, outwardsA, outwardsB, size, null, Vector2.zero);
                        if (EditorGUI.EndChangeCheck())
                        {
                            if (Event.current.shift)
                            {
                                angle = Mathf.Round((angle - euler.z) / 15f) * 15f + euler.z;
                            }
                            euler.z  = angle;
                            rotation = Quaternion.Euler(euler);
                        }
                    }
                }
            }
            return(rotation);
        }