UnityEditor.HandleUtility.DistanceToRectangleInternal C# (CSharp) Method

        internal static float DistanceToRectangleInternal(Vector3 position, Quaternion rotation, Vector2 size)
        {
            Vector3 vector = (Vector3) (rotation * new Vector3(size.x, 0f, 0f));
            Vector3 vector2 = (Vector3) (rotation * new Vector3(0f, size.y, 0f));
            points[0] = (Vector3) WorldToGUIPoint((position + vector) + vector2);
            points[1] = (Vector3) WorldToGUIPoint((position + vector) - vector2);
            points[2] = (Vector3) WorldToGUIPoint((position - vector) - vector2);
            points[3] = (Vector3) WorldToGUIPoint((position - vector) + vector2);
            points[4] = points[0];
            Vector2 mousePosition = Event.current.mousePosition;
            bool flag = false;
            int index = 4;
            for (int i = 0; i < 5; i++)
            {
                if (((points[i].y > mousePosition.y) != (points[index].y > mousePosition.y)) && (mousePosition.x < ((((points[index].x - points[i].x) * (mousePosition.y - points[i].y)) / (points[index].y - points[i].y)) + points[i].x)))
                {
                    flag = !flag;
                }
                index = i;
            }
            if (!flag)
            {
                float num4 = -1f;
                index = 1;
                for (int j = 0; j < 4; j++)
                {
                    float num3 = DistancePointToLineSegment(mousePosition, points[j], points[index++]);
                    if ((num3 < num4) || (num4 < 0f))
                    {
                        num4 = num3;
                    }
                }
                return num4;
            }
            return 0f;
        }

 private static void HandleCap(int controlID, Vector3 position, GUIStyle guiStyle, EventType eventType)
 {
     if (eventType != EventType.Layout)
     {
         if (eventType == EventType.Repaint)
         {
             Handles.BeginGUI();
             position = HandleUtility.WorldToGUIPoint(position);
             float fixedWidth  = guiStyle.fixedWidth;
             float fixedHeight = guiStyle.fixedHeight;
             Rect  position2   = new Rect(position.x - fixedWidth / 2f, position.y - fixedHeight / 2f, fixedWidth, fixedHeight);
             guiStyle.Draw(position2, GUIContent.none, controlID);
             Handles.EndGUI();
         }
     }
     else
     {
         HandleUtility.AddControl(controlID, HandleUtility.DistanceToRectangleInternal(position, Quaternion.identity, Vector2.zero));
     }
 }