do_line.3alleg

Langue: en

Version: version 4.2.2 (debian - 07/07/09)

Section: 3 (Bibliothèques de fonctions)

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(3alleg), do_ellipse(3alleg), do_arc(3alleg), line(3alleg)