function plotshape ( xlist, ylist, color )
%
%  PLOTSHAPE will draw the shape with vertices XLIST, YLIST.
%
%  COLOR can be the one letter abbreviation 'r', 'g', 'b', 'c', 'm', 'y', 'w', 'k',
%  or it can be the RGB list [ r, g, b ] with three values between 0 and 1.
%
  plot ( [ xlist, xlist(1)], [ ylist, ylist(1)], 'Color', color, 'LineWidth', 3 );

  return
end
