1 /* $OpenBSD: shapes.c,v 1.7 2003/06/03 03:01:41 millert Exp $ */
2 /* $NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1992, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Chris Torek and Darren F. Provine.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)shapes.c 8.1 (Berkeley) 5/31/93
36 */
37
38 /*
39 * Tetris shapes and related routines.
40 *
41 * Note that the first 7 are `well known'.
42 */
43
44 #include <unistd.h>
45 #include "tetris.h"
46
47 #define TL -B_COLS-1 /* top left */
48 #define TC -B_COLS /* top center */
49 #define TR -B_COLS+1 /* top right */
50 #define ML -1 /* middle left */
51 #define MR 1 /* middle right */
52 #define BL B_COLS-1 /* bottom left */
53 #define BC B_COLS /* bottom center */
54 #define BR B_COLS+1 /* bottom right */
55
56 const struct shape shapes[] = {
57 /* 0*/ { 7, 7, { TL, TC, MR } },
58 /* 1*/ { 8, 8, { TC, TR, ML } },
59 /* 2*/ { 9, 11, { ML, MR, BC } },
60 /* 3*/ { 3, 3, { TL, TC, ML } },
61 /* 4*/ { 12, 14, { ML, BL, MR } },
62 /* 5*/ { 15, 17, { ML, BR, MR } },
63 /* 6*/ { 18, 18, { ML, MR, 2 } }, /* sticks out */
64 /* 7*/ { 0, 0, { TC, ML, BL } },
65 /* 8*/ { 1, 1, { TC, MR, BR } },
66 /* 9*/ { 10, 2, { TC, MR, BC } },
67 /*10*/ { 11, 9, { TC, ML, MR } },
68 /*11*/ { 2, 10, { TC, ML, BC } },
69 /*12*/ { 13, 4, { TC, BC, BR } },
70 /*13*/ { 14, 12, { TR, ML, MR } },
71 /*14*/ { 4, 13, { TL, TC, BC } },
72 /*15*/ { 16, 5, { TR, TC, BC } },
73 /*16*/ { 17, 15, { TL, MR, ML } },
74 /*17*/ { 5, 16, { TC, BC, BL } },
75 /*18*/ { 6, 6, { TC, BC, 2*B_COLS } }/* sticks out */
76 };
77
78 /*
79 * Return true iff the given shape fits in the given position,
80 * taking the current board into account.
81 */
82 int
fits_in(shape,pos)83 fits_in(shape, pos)
84 const struct shape *shape;
85 int pos;
86 {
87 int *o = shape->off;
88
89 if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
90 board[pos + *o])
91 return 0;
92 return 1;
93 }
94
95 /*
96 * Write the given shape into the current board, turning it on
97 * if `onoff' is 1, and off if `onoff' is 0.
98 */
99 void
place(shape,pos,onoff)100 place(shape, pos, onoff)
101 const struct shape *shape;
102 int pos, onoff;
103 {
104 int *o = shape->off;
105
106 board[pos] = onoff;
107 board[pos + *o++] = onoff;
108 board[pos + *o++] = onoff;
109 board[pos + *o] = onoff;
110 }
111