do_arc(3alleg4)                  Allegro manual                  do_arc(3alleg4)

       do_arc - Calculates all the points in a circular arc. Allegro game
       programming library.

       #include <allegro.h>

       void do_arc(BITMAP *bmp, int x, int y, fixed a1, fixed a2, int r, int d,
       void (*proc)(BITMAP *bmp, int x, int y, int d));

       Calculates all the points in a circular arc 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(). The arc will be
       plotted in an anticlockwise direction starting from the angle a1 and
       ending when it reaches a2. These values are specified in 16.16 fixed
       point format, with 256 equal to a full circle, 64 a right angle, etc.
       Zero is to the right of the centre point, and larger values rotate
       anticlockwise from there. Example:

          void draw_explosion_ring(BITMAP *bmp, int x, int y, int d)
             do_arc(screen, SCREEN_W/2, SCREEN_H/2,
                 itofix(-21), itofix(43), 50, flame_color,

       do_circle(3alleg4), do_ellipse(3alleg4), do_line(3alleg4), arc(3alleg4)

Allegro                           version 4.4.3                  do_arc(3alleg4)