| Rectangle Add(int left, int top, int right, int bottom); | Adds a rectangle area with the specified (left, top, right, bottom) boundaries to the region. Returns the added rectangle. |
| Rectangle Add(Rectangle rectangle); | Adds the passed rectangle to the field region. Returns the added rectangle. |
| bool Remove(Rectangle rectangle); | Removes the passed rectangle from the field region rectangle list. Returns true if removed successfully and returns false otherwise. |
| bool Remove(int rectangleIndex); | Removes the rectangle area with the specified index from the field region rectangle list. Returns true if removed successfully and returns false otherwise. |
| void Clear(); | Removes all rectangle areas from the list. |
