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     The _setgtextvector function sets the current orientation for font
     text output to the vector specified by <x> and <y>. The current
     orientation is used in calls to the _outgtext function.
 
     The values of <x> and <y> define the vector, which determines the
     rotation direction of font text on the screen. The text rotation
     options are shown below:
 
     (x, y)     Text Orientation
 
     (0,0)      Unchanged
     (1,0)      Horizontal text (default)
     (0,1)      Rotated 90 degrees counterclockwise
     (-1,0)     Rotated 180 degrees
     (0,-1)     Rotated 270 degrees counterclockwise
 
     If other values are input, only the sign of the input is used. For
     example, (-3,0) is interpreted as (-1,0).
 
     The _getgtextvector function gets the current orientation for font
     text output.
 
     Return Value
 
     The _getgtextvector and _setgtextvector functions return the previous
     vector in a structure of type xycoord. If you pass the _setgtextvector
     function the values (0, 0), the function returns the current
     vector values in the xycoord structure.
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