rdr(3G)

NAME
     rdr, rdri, rdrs, rdr2, rdr2i, rdr2s - relative draw

C SPECIFICATION
     void rdr(dx, dy, dz)
     Coord dx, dy, dz;

     void rdri(dx, dy, dz)
     Icoord dx, dy, dz;

     void rdrs(dx, dy, dz)
     Scoord dx, dy, dz;

     void rdr2(dx, dy)
     Coord dx, dy;

     void rdr2i(dx, dy)
     Icoord dx, dy;

     void rdr2s(dx, dy)
     Scoord dx, dy;

     All of the above routines are functionally the same.  They differ only in
     the type declarations of their parameters and whether or not they assume
     a two- or three-dimensional space.

PARAMETERS
     dx   expects the distance from the x coordinate of the current graphics
          position to the x coordinate of the new point.

     dy   expects the distance from the y coordinate of the current graphics
          position to the y coordinate of the new point.

     dz   expects the distance from the z coordinate of the current graphics
          position to the z coordinate of the new point.

DESCRIPTION
     rdr is the relative version of draw.  It connects the current graphics
     position and a point, at the specified distance, with a line segment
     using the current linestyle, linewidth, color (if in depth-cue mode, the
     depth-cued color is used), and writemask.  The system updates the current
     graphics position to the new point.

     Do not place routines that invalidate the current graphics position
     within sequences of relative moves and draws.

SEE ALSO
     bgnline, endline, popmatrix, pushmatrix, rmv, translate, v
NOTE
     rdr should not be used in new development.  Rather, lines should be drawn
     using the high-performance v commands, surrounded by calls to bgnline and
     endline.  Matrix commands pushmatrix, translate, and popmatrix should be
     used to accomplish relative positioning.