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 _getgtextextent()       Get graphics text length in pixels

 #include   <graph.h>

 short _getgtextextent(text);
 unsigned char _far *text;      Text to be tested

    _getgtextextent() returns the length (in pixels) of the string text
    in the current screen font (as it would be displayed with _outgtext()).
    This is especially useful with variable width fonts.

    Returns:         The length of text in pixels; -1 if no font
                     was registered.

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

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

    This program prints out characters from the first .FON file it finds:

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

    unsigned char *tstring = "Here is the Text";

    void main()
    {
        struct videoconfig vstruc;
        struct _fontinfo finfo;
        short nfont, maxfonts, halfinx, halfiny;

        _setvideomode(_MAXRESMODE);
        _getvideoconfig(&vstruc);
        _registerfonts("*.FON");
        _clearscreen(_GCLEARSCREEN);

        halfinx = vstruc.numxpixels/2 - _getgtextextent(tstring)/2;
        halfiny = vstruc.numypixels/2 + _getgtextextent(tstring)/2;
        _moveto(halfinx, halfiny);

        _setfont("n1");     /* Display first font */
        _setgtextvector(1, 0);
        _outgtext(tstring);
        _setgtextvector(-1, 0);
        _outgtext(tstring);
        _getfontinfo(&finfo);
        getch();

        _unregisterfonts();
        _setvideomode(_DEFAULTMODE);
    }