| 
            plmtex3
          ( | side , | 
| disp , | |
| pos , | |
| just , | |
| text ); | 
      Writes text at a specified position relative to the viewport
      boundaries.  Text may be written inside or outside the viewport, but
      is clipped at the subpage boundaries.  The reference point of a
      string lies along a line passing through the string at half the
      height of a capital letter.  The position of the reference point
      along this line is determined by
      
        , and the position of
      the reference point relative to the viewport is set by
      just
      
         and
      disp
      
        .
    pos
      
side
          (PLCHAR_VECTOR
            An ascii character string specifying the
            side of the viewport along which the text is to
            be written. The string should contain one or more of the
            following characters: [xyz][ps][v].
            Only one label is drawn at a time, i.e. xyp
            will only label the X axis, not both the X and Y axes.
            
                  x: Label the X axis.
                
                  y: Label the Y axis.
                
                  z: Label the Z axis.
                
                  p: Label the “primary”
                  axis. For Z this is the leftmost Z axis. For X it is
                  the axis that starts at y-min. For Y it is the axis that
                  starts at x-min.
                
                  s: Label the “secondary”
                  axis.
                
                  v: Draw the text perpendicular to the
                  axis.
                
disp
          (PLFLT
            Position of the reference point of string, measured outwards
            from the specified viewport edge in units of the current
            character height.  Use negative
            disp
pos
          (PLFLTPosition of the reference point of string along the specified edge, expressed as a fraction of the length of the edge.
just
          (PLFLT
            Specifies the position of the string relative to its reference
            point.  If 
              ,
            the reference point is at the left and if
            just=0.
            
              , it is at the
            right of the string.  Other values of
            just=1.
            
               give
            intermediate justifications.
          just
            
text
          (PLCHAR_VECTORA UTF-8 character string to be written out.
      Redacted form: plmtex3(side, disp, pos, just, text)
    
This function is used in example 28.