Calculates all the points in a circle.
void do_circle(BITMAP *
d, void (*
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,
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