Calculates all the points in a circle.


void do_circle(BITMAP *bmp, int x, int y, int radius, int d, void (*proc)(BITMAP *bmp, int x, int y, int d));
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);

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