NAME

       gl_bcircle - draw a filled or unfilled Bresenham circle

SYNOPSIS

       #include <vgagl.h>

       void gl_bcircle(int x, int y, int r, int c, int fill);

DESCRIPTION

       Draw a Bresenham circle of radius r in color c , centered at ( x ,  y ).

       Fill should be 0 for a hollow circle, or any other value for a solid color.

       This  function  differs  from gl_circle (3) and gl_fillcircle (3) in that it looks good in
       320  x  200  screen  modes.  The  modified  algorithm  was  provided  by  Chris   Atenasio
       <chris@svgalib.org>, and is based upon Bresenham's formula.

       Note  that  the "circle" is technically an ellipse, and is actually wider than it is tall.
       Therefore, r is equal to the circle's height, but is less than its width. This  distortion
       is necessary to accomodate the 8:5 aspect ratio (e.g., 320 x 200).

       I  don't  recommend  using this function in standard 4:3 screen modes (e.g., 640 x 480 and
       higher). Furthermore, care must be taken so that a circle drawn with this  function  isn't
       copied  to  a  screen  with  a  different  aspect  ratio.  Otherwise,  the  result  may be
       undesirable.

SEE ALSO

       svgalib(7), vgagl(7), svgalib.conf(5),  threedkit(7),  testgl(1),  plane(1),  wrapdemo(1),
       gl_circle(3),       gl_clearscreen(3),       gl_colorfont(3),       gl_disableclipping(3),
       gl_enableclipping(3),   gl_fillbox(3),    gl_fillcircle(3),    gl_hline(3),    gl_line(3),
       gl_setclippingwindow(3),  gl_setpalette(3), gl_setpalettecolor(3), gl_setpalettecolors(3),
       gl_setpixel(3), gl_setpixelrgb(3), gl_setrgbpalette(3), gl_setwritemode(3).

AUTHOR

       This manual page was written by Jay Link <jlink@svgalib.org>.