do_line(3)                      Allegro manual                      do_line(3)



NAME
       do_line - Calculates all the points along a line. Allegro game
       programming library.

SYNOPSIS
       #include <allegro.h>


       void do_line(BITMAP *bmp, int x1, y1, x2, y2, int d, void
       (*proc)(BITMAP *bmp, int x, int y, int d));

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:

          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);


SEE ALSO
       do_circle(3), do_ellipse(3), do_arc(3), line(3)



Allegro                          version 4.2.3                      do_line(3)
