source: ttyvaders/trunk/src/starfield.c @ 38

Last change on this file since 38 was 38, checked in by Sam Hocevar, 18 years ago
  • I think I fucked up the $Id tags on my previous commit.
File size: 2.0 KB
Line 
1/*
2 *   ttyvaders     Textmode shoot'em up
3 *   Copyright (c) 2002 Sam Hocevar <sam@zoy.org>
4 *                 All Rights Reserved
5 *
6 *   $Id: starfield.c,v 1.4 2002/12/22 18:44:12 sam Exp $
7 *
8 *   This program is free software; you can redistribute it and/or modify
9 *   it under the terms of the GNU General Public License as published by
10 *   the Free Software Foundation; either version 2 of the License, or
11 *   (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include <stdlib.h>
24
25#include "common.h"
26
27void init_starfield( game *g, starfield *s )
28{
29    int i;
30
31    for( i = 0; i < STARS; i++ )
32    {
33        s->x[i] = rand() % g->w;
34        s->y[i] = rand() % g->h;
35        s->z[i] = 1 + rand() % 3;
36        s->ch[i] = (rand() % 2) ? '.' : '\'';
37        s->c[i] = 6 + rand() % 2;
38    }
39}
40
41void draw_starfield( game *g, starfield *s )
42{
43    int i;
44
45    for( i = 0; i < STARS; i++ )
46    {
47        if( s->x[i] >= 0 )
48        {
49            gfx_color( s->c[i] );
50            gfx_goto( s->x[i], s->y[i] );
51            gfx_putchar( s->ch[i] );
52        }
53    }
54}
55
56void update_starfield( game *g, starfield *s )
57{
58    int i;
59
60    for( i = 0; i < STARS; i++ )
61    {
62        if( s->x[i] < 0 )
63        {
64            s->x[i] = rand() % g->w;
65            s->y[i] = 0;
66            s->z[i] = 1 + rand() % 2;
67            s->ch[i] = (rand() % 2) ? '.' : '\'';
68            s->c[i] = 6 + rand() % 2;
69        }
70        else if( s->y[i] < g->h-1 )
71        {
72            s->y[i] += s->z[i];
73        }
74        else
75        {
76            s->x[i] = -1;
77        }
78    }
79}
80
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