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.