.\" Generated by the Allegro makedoc utility
.TH do_arc 3alleg4 "version 4.4.3" "Allegro" "Allegro manual"
.SH NAME
do_arc \- Calculates all the points in a circular arc. Allegro game programming library.\&
.SH SYNOPSIS
.B #include <allegro.h>

.sp
.B void do_arc(BITMAP *bmp, int x, int y, fixed a1, fixed a2, int r, int d,
.B void (*proc)(BITMAP *bmp, int x, int y, int d));
.SH DESCRIPTION
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:

.nf
   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,
          draw_explosion_ring);
.fi

.SH SEE ALSO
.BR do_circle (3alleg4),
.BR do_ellipse (3alleg4),
.BR do_line (3alleg4),
.BR arc (3alleg4)