#include <graphics.h>
void settextstyle(int font, int direction, int charsize);
 

settextstyle sets the text font, the direction in which text is
displayed, and the size of the characters. A call to settextstyle affects
all text output by outtext and outtextxy.
The parameters font, direction, and charsize passed to settextstyle are
described in the following:
font: One 8x8 bit-mapped font and several "stroked" fonts are available.
The 8x8 bit-mapped font is the default. The enumeration font_names, which
is defined in graphics.h, provides names for these different font
settings:
Name    Value  ==== Description of settextstyle ==== 
<code c>
DEFAULT_FONT  0  8x8 bit-mapped font
TRIPLEX_FONT  1  Stroked triplex font
SMALL_FONT    2  Stroked small font
SANS_SERIF_FONT     3  Stroked sans-serif font
GOTHIC_FONT   4  Stroked gothic font
SCRIPT_FONT   5  Stroked script font
SIMPLEX_FONT  6  Stroked triplex script font
TRIPLEX_SCR_FONT  7  Stroked triplex script font
COMPLEX_FONT  8  Stroked complex font
EUROPEAN_FONT 9  Stroked European font
BOLD_FONT     10 Stroked bold font
The default bit-mapped font is built into the graphics system. Stroked
fonts are stored in *.CHR disk files, and only one at a time is kept in
memory. Therefore, when you select a stroked font (different from the
last selected stroked font), the corresponding *.CHR file must be loaded
from disk.
To avoid this loading when several stroked fonts are used, you can link
font files into your program. Do this by converting them into object
files with the BGIOBJ utility, then registering them through
registerbgifont.
direction: Font directions supported are horizontal text (left to right)
and vertical text (rotated 90 degrees counterclockwise). The default
direction is HORIZ_DIR. The size of each character can be magnified using
the charsize factor. If charsize is nonzero, it can affect bit-mapped or
stroked characters. A charsize value of 0 can be used only with stroked
fonts.
    * If charsize equals 1, outtext and outtextxy displays characters
from the 8x8 bit-mapped font in an 8x8 pixel rectangle onscreen.
    * If charsize equals 2, these output functions display characters
from the 8x8 bit-mapped font in a 16*16 pixel rectangle, and so on
(up to a limit of ten times the normal size).
    * When charsize equals 0, the output functions outtext and outtextxy
magnify the stroked font text using either the default character
magnification factor (4) or the user-defined character size given
by setusercharsize.
Always use textheight and textwidth to determine the actual dimensions of
the text.

/* settextstyle example */
 
#include <graphics.h>
#include <stdlib.h>
#include <stdio.h>
#include <conio.h>
 
/* the names of the text styles supported */
char *fname[] = { "DEFAULT font",  "TRIPLEX font",
"SMALL font",    "SANS SERIF_font",
"GOTHIC_font",   "SCRIPT font",
"SIMPLEX font",  "TRIPLEX SCRIPT font",
"COMPLEX font",  "EUROPEAN font",
"BOLD font"};
 
int main(void)
{
   /* request autodetection */
 
   int gdriver = DETECT, gmode, errorcode;
   int style, midx, midy;
   int size = 1;
 
   /* initialize graphics and local variables */
   initgraph(&gdriver, &gmode, "");
 
   /* read result of initialization */
   errorcode = graphresult();
   if (errorcode != grOk) {  /* an error occurred */
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1);   /* terminate with an error code */
 
   }
 
   midx = getmaxx() / 2;
   midy = getmaxy() / 2;
   settextjustify(CENTER_TEXT, CENTER_TEXT);
 
   /* loop through the available text styles */
   for (style=DEFAULT_FONT; style<=BOLD_FONT; style++) {
cleardevice();
if (style == TRIPLEX_FONT)
   size = 4;
/* select the text style */
settextstyle(style, HORIZ_DIR, size);
 
/* output a message */
outtextxy(midx, midy, fname[style]);
getch();
   }
   /* clean up */
 
   closegraph();
   return 0;
}

gettextsettings graphresults installuserfont settextjustify setusercharsize textheight textwidth

  no output of example at the moment
  do not hesitate and add it...