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 _setwritemode()         Set logical graphics write mode

 #include   <graph.h>

 short _setwritemode(action);
 short action           _GAND, _GOR, _GPRESET, _GPSET, or _GXOR.

    _setwritemode() sets the logical graphics write mode for such
    functions as _lineto(), _rectangle(), and _polygon(). The
    possibilities for the write mode are these:

              _GAND  _GOR  _GPRESET  _GPSET  _GXOR

    Returns:    previous write mode if successful; -1 otherwise.

   Portability:     MS-DOS only, true MDPA, CGA, EGA, MCGA, or VGA video
                    compatibles

   -------------------------------- Example ---------------------------------

     This program sets the write mode to PSET.

    #include <conio.h>
    #include <stdlib.h>
    #include <graph.h>
    #include <stdlib.h>

    void main()
    {
        struct xycoord rver[3];
        _setvideomode(_MAXCOLORMODE);
        _setwritemode(_GPSET);

        rver[0].xcoord = 10;
        rver[0].ycoord = 10;
        rver[1].xcoord = 10;
        rver[1].ycoord = 50;
        rver[2].xcoord = 50;
        rver[2].ycoord = 50;
        _polygon(_GBORDER, rver, 3);

        getch();
        _setvideomode(_DEFAULTMODE);
    }