function [ x2, y2 ] = triangle_shift ( x, y, xplus, yplus )
%
%  This function shifts a triangle by xplus, yplus.
%
%  X and Y are the coordinates of the vertices of the triangle.
%  XPLUS and YPLUS are the shift amounts.
%
%  X2 and Y2 are the coordinates of the shifted triangle.
%
  x2 = x + xplus;
  y2 = y + yplus;

  return
end
