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do_arc(3)			Allegro	manual			     do_arc(3)

NAME
       do_arc -	Calculates all the points in a circular	arc. Allegro game pro-
       gramming	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  ro-
       tate 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(3), do_ellipse(3), do_line(3),	arc(3)

Allegro				 version 4.4.3			     do_arc(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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