do_circle (3) - Linux Manuals
do_circle: Calculates all the points in a circle. Allegro game programming library.
NAME
do_circle - Calculates all the points in a circle. Allegro game programming library.SYNOPSIS
#include <allegro.h>
void do_circle(BITMAP *bmp, int x, int y, int radius, int d, void (*proc)(BITMAP *bmp, int x, int y, int d));
DESCRIPTION
Calculates all the points in a circle around point (x, y) with radius r, calling the supplied function for each one. This will be passed a copy of the bmp parameter, the x and y position, and a copy of the d parameter, so it is suitable for use with putpixel(). Example:
void draw_explosion_ring(BITMAP *bmp, int x, int y, int d)
{
...
}
do_circle(screen, SCREEN_W/2, SCREEN_H/2,
SCREEN_H/16, flame_color,
draw_explosion_ring);