do_line(3) Allegro manual do_line(3)NAMEdo_line - Calculates all the points along a line. Allegro game program‐
ming library.
SYNOPSIS
#include <allegro.h>
void do_line(BITMAP *bmp, int x1, y1, x2, y2, int d, void (*proc)(BIT‐
MAP *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 parame‐
ter, 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 ALSOdo_circle(3), do_ellipse(3), do_arc(3), line(3)Allegro version 4.4.2 do_line(3)