source: ttyvaders/trunk/src/starfield.c @ 2990 Tweet

/*
 *  ttyvaders     Textmode shoot'em up
 *  Copyright (c) 2002 Sam Hocevar <sam@zoy.org>
 *                All Rights Reserved
 *
 *  $Id: starfield.c 2990 2008-10-18 21:42:24Z sam $
 *
 *  This program is free software. It comes without any warranty, to
 *  the extent permitted by applicable law. You can redistribute it
 *  and/or modify it under the terms of the Do What The Fuck You Want
 *  To Public License, Version 2, as published by Sam Hocevar. See
 *  http://sam.zoy.org/wtfpl/COPYING for more details.
 */

#include "config.h"

#include <stdlib.h>

#include "common.h"

starfield * create_starfield(game *g)
{
    int i;
    starfield *s;

    s = malloc(STARS * sizeof(starfield));
    if(s == NULL)
        exit(1);

    for(i = 0; i < STARS; i++)
    {
        s[i].x = caca_rand(0, g->w - 1);
        s[i].y = caca_rand(0, g->h - 1);
        s[i].z = caca_rand(1, 3);
        s[i].c = caca_rand(0, 1) ? CACA_COLOR_LIGHTGRAY : CACA_COLOR_DARKGRAY;
        s[i].ch = caca_rand(0, 1) ? '.' : '\'';
    }

    return s;
}

void draw_starfield(game *g, starfield *s)
{
    int i;

    for(i = 0; i < STARS; i++)
    {
        if(s[i].x >= 0)
        {
            caca_set_color(g->cv, s[i].c, CACA_COLOR_BLACK);
            caca_putchar(g->cv, s[i].x, s[i].y, s[i].ch);
        }
    }
}

void update_starfield(game *g, starfield *s)
{
    int i;

    for(i = 0; i < STARS; i++)
    {
        if(s[i].x < 0)
        {
            s[i].x = caca_rand(0, g->w - 1);
            s[i].y = 0;
            s[i].z = caca_rand(1, 2);
            s[i].c = caca_rand(0, 1) ? CACA_COLOR_LIGHTGRAY : CACA_COLOR_DARKGRAY;
            s[i].ch = caca_rand(0, 1) ? '.' : '\'';
        }
        else if(s[i].y < g->h-1)
        {
            s[i].y += s[i].z;
        }
        else
        {
            s[i].x = -1;
        }
    }
}

void free_starfield(game *g, starfield *s)
{
    free(s);
}