gl_printf(3) Svgalib User Manual gl_printf(3)
NAME
gl_printf - write formatted output in graphic mode
SYNOPSIS
#include <vgagl.h>
int gl_printf(int x, int y, const char *fmt, ...);
DESCRIPTION
gl_printf writes, like printf(3) a formatted string to position (x, y) using the currently selected font. If one or both of x and y is neg-
ative, the text printing continues at the last position. The special characters ,
,
, a, and v have the usual effects.
Printing wraps at the screen borders. Nevertheless, behaviour is undefined if not a single characters fits on the screen or if the initial
position is outside the screen.
The kind of text draw operation is set with gl_setwritemode(3).
BEWARE! Prior to the of use of gl_printf(3) you must set a font.
A good default initialization sequence is:
gl_setfont(8, 8, gl_font8x8);
gl_setwritemode(FONT_COMPRESSED + WRITEMODE_OVERWRITE);
gl_setfontcolors(0, vga_white());
RETURN VALUE
The number of characters printed.
BUGS
For compatibility reasons this function is not contained in a.out libraries.
SEE ALSO
printf(3), svgalib(7), vgagl(7), gl_colorfont(3), gl_expandfont(3), gl_font8x8(3), gl_setfont(3), gl_setfontcolors(3), gl_setwritemode(3),
gl_write(3), gl_writechar(3), printftest(6).
AUTHOR
This function and manual page was written by Trek <trek00@freenet.hut.fi> <trek@mediaservice.net>.
Svgalib 1.3.0 22 Feb 1997 gl_printf(3)
