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HP_ROTATE()                                                        C_EXAM7C
   Changes the orientation of the HPGL output device.

   Syntax
         nOrientation = HP_ROTATE([nOrientation])

   Arguments
         OPTIONAL PARAMETERS
         nOrientation Sets the orientation of the HPGL output device.
                      0 - no rotation (default)
                      90 - rotated 90 degrees

                 +-----------------------------------------+
                 |    DEVICE UNITS      |Portrait|Landscape|
                 -----------------------+--------+---------|
                 |Horizontal resolution |   640  |    640  |
                 |Vertical resolution   |   480  |    480  |
                 |P1 horizontal position|   232  |    232  |
                 |P1 vertical position  |  4454  |    232  |
                 |P2 horizontal position|  7800  |  10160  |
                 |P2 vertical position  | 10130  |   7702  |
                 |Horizontal offset     |     0  |      0  |
                 |Vertical offset       |     0  |      0  |
                 +-----------------------------------------+

   Returns
         nOrientation Returns the current orientation.

   Description
         HP_ROTATE() changes the orientation of the HPGL output device.
         A 0 will change to the default condition, while a 90 will turn
         the image 90 degrees. When HP_ROTATE() is issued, the size of the
         graph on the page and the scaling are returned to their default
         states for that orientation.