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

NAME

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

SYNOPSIS

       #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));

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:

	  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);

SEE ALSO

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

Allegro 							   version 4.4.2						   do_arc(3alleg4)