Question about function Post: 31417

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LEARN ABOUT DEBIAN

gl_bcircle

gl_bcircle(3)							Svgalib User Manual						     gl_bcircle(3)

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_set-
       palette(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>.

Svgalib (>;= 1.4.1)						    4 Dec 1999							     gl_bcircle(3)

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