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

.sp
.B void do_line(BITMAP *bmp, int x1, y1, x2, y2, int d, 
.B void (*proc)(BITMAP *bmp, int x, int y, int d));
.SH DESCRIPTION
Calculates all the points along a line from point (x1, y1) to (x2, y2), 
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:

.nf
   void draw_dust_particle(BITMAP *bmp, int x, int y, int d)
   {
      ...
   }
   
      do_line(screen, 0, 0, SCREEN_W-1, SCREEN_H-2,
              dust_strength, draw_dust_particle);
.fi

.SH SEE ALSO
.BR do_circle (3alleg4),
.BR do_ellipse (3alleg4),
.BR do_arc (3alleg4),
.BR line (3alleg4)