A shadow is attached within the box graph of y direction.
| Call | DclShadeYBoxArea | (X, y1, y2, [pattern1], [pattern2]) |
| X | < R (:) > | The central x coordinates value (the user coordinates) of a box graph. |
| Y1, y2 | < R (:) > | The y coordinates value (the user coordinates) of both ends of a box graph. |
| Pattern1 | < I > | The pattern number at the time of y1 < y2. |
| Pattern2 | < I > | The pattern number at the time of y1 > y2. |