%N grvect %F $MIR/src/grvect.f
%D Draw line segments or dots
%B
      SUBROUTINE GRVECT (IDENT,MODE,ABSXY,POINTS,X,Y)

 GRPCKG: Draw a line or a set of dots. This routine can be used to
 draw a single line-segment, a continuous series of line segments, or
 one or more single dots (pixels).

 Arguments:

 IDENT (input, integer): the plot identifier, as returned by GROPEN.
 MODE (input, integer): if MODE=1, a series of line segments is drawn,
       starting at the current position, moving to X(1),Y(1), ... and
       ending at X(POINTS),Y(POINTS).
       If MODE=2, the first vector is blanked, so the line starts at
       X(1),Y(1).
       If MODE=3, a single dot is placed at each coordinate pair, with
       no connecting lines.
 ABSXY (input, logical): if TRUE, the coordinates are absolute device
       coordinates; if FALSE, they are world coordinates and the
       scaling transformation is applied.
 POINTS (input, integer): the number of coordinate pairs.
 X, Y (input, real arrays, dimensioned POINTS or greater): the
       X and Y coordinates of the points.
