## 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 <[email protected]>, 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.