vga_drawline(3) [suse man page]

vga_drawline(3) 						Svgalib User Manual						   vga_drawline(3)

NAME

       vga_drawline - draw a line on the screen

SYNOPSIS

       #include <vga.h>

       int vga_drawline(int x1, int y1, int x2, int y2);

DESCRIPTION

       draws a line from (x1, y1) to (x2, y2) on the screen. If you exchange start and end of the line you should not expect the exactly identical
       set of pixel be covered by the line.

       This function is very inefficient as is does a bunch of vga_drawpixel(3) calls, you should consider using gl_line(3) which  is  very  effi-
       cient, or doing direct screen access instead or use vga_drawscansegment(3) to handle more than one pixel.

       The color drawn is set with vga_setcolor(3) or vga_setrgbcolor(3) resp.

       The function always returns 0 (on which you should probably not really rely).

SEE ALSO

       svgalib(7),  vgagl(7),  libvga.config(5),  gl_line(3)  vga_clear(3), vga_setcolor(3), vga_setrgbcolor(3), vga_getpixel(3), vga_drawline(3),
       vga_drawscanline(3), vga_drawscansegment(3), vga_getscansegment(3)

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
       original documentation is unknown.  This Page was modified by Don Secrest <secrest@uiuc.edu>

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally  this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						  21 August 1999						   vga_drawline(3)

vga_flip(3)							Svgalib User Manual						       vga_flip(3)

NAME

       vga_flip - toggle between text and graphics mode

SYNOPSIS

       #include <vga.h>

       int vga_flip(void);

DESCRIPTION

       switches  between  graphics  and  text mode without destroying the screen contents. This makes it possible for your application to use both
       text and graphics output.

       However, This is an old vgalib function. You should really only use it for debugging as it runs extremely unstable because svgalib now does
       its  own  virtual  console  management. If you want to perform a similar action, save the current screen contents with ordinary memory copy
       operation to the frame buffer or gl_getbox(3), set vga_setmode(TEXT), then call vga_setmode(3) to return to graphics operation and  restore
       the screen contents with memory or gl_putbox(3).

       One could also use vga_drawscansegment(3) and vga_getscansegment(3) calls.

       However, avoid any calls to vga_flip() in your applications.

       The function always returns 0, a fact on which you shouldn't rely.

       It  might  be  useful if you are debugging one of your svgalib applications though.  If your program reaches a breakpoint while in graphics
       mode, you can switch to text mode with the gdb command

       print vga_flip()

       and later restore the graphics screen contents with the same command.  It is useful to define the following alias in gdb:

       define flip <Return> print vga_flip() <Return> end <Return>

SEE ALSO

       svgalib(7), vgagl(7),  libvga.config(5),  vga_init(3),  vga_setflipchar(3),  vga_drawscanline(3),  vga_drawscansegment(3),  vga_getscanseg-
       ment(3), gl_getbox(3), gl_putbox(3)

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The exact source of the referenced function as well as of the
       original documentation is unknown.

       It is very likely that both are at least to some extent are due to Harm Hanemaayer <H.Hanemaayer@inter.nl.net>.

       Occasionally this might be wrong. I hereby asked to be excused by the original author and will happily accept any additions or  corrections
       to this first version of the svgalib manual.

Svgalib (>;= 1.2.11)						   27 July 1997 						       vga_flip(3)