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/* $NetBSD: shapes.c,v 1.2 1995/04/22 07:42:44 cgd Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek and Darren F. Provine.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)shapes.c 8.1 (Berkeley) 5/31/93
*/
/*
* Tetris shapes and related routines.
*
* Note that the first 7 are `well known'.
*/
#include <unistd.h>
#include "tetris.h"
#define TL -B_COLS-1 /* top left */
#define TC -B_COLS /* top center */
#define TR -B_COLS+1 /* top right */
#define ML -1 /* middle left */
#define MR 1 /* middle right */
#define BL B_COLS-1 /* bottom left */
#define BC B_COLS /* bottom center */
#define BR B_COLS+1 /* bottom right */
struct shape shapes[] = {
/* 0*/ 7, TL, TC, MR,
/* 1*/ 8, TC, TR, ML,
/* 2*/ 9, ML, MR, BC,
/* 3*/ 3, TL, TC, ML,
/* 4*/ 12, ML, BL, MR,
/* 5*/ 15, ML, BR, MR,
/* 6*/ 18, ML, MR, /* sticks out */ 2,
/* 7*/ 0, TC, ML, BL,
/* 8*/ 1, TC, MR, BR,
/* 9*/ 10, TC, MR, BC,
/*10*/ 11, TC, ML, MR,
/*11*/ 2, TC, ML, BC,
/*12*/ 13, TC, BC, BR,
/*13*/ 14, TR, ML, MR,
/*14*/ 4, TL, TC, BC,
/*15*/ 16, TR, TC, BC,
/*16*/ 17, TL, MR, ML,
/*17*/ 5, TC, BC, BL,
/*18*/ 6, TC, BC, /* sticks out */ 2*B_COLS,
};
/*
* Return true iff the given shape fits in the given position,
* taking the current board into account.
*/
int
fits_in(shape, pos)
struct shape *shape;
register int pos;
{
register int *o = shape->off;
if (board[pos] || board[pos + *o++] || board[pos + *o++] ||
board[pos + *o])
return 0;
return 1;
}
/*
* Write the given shape into the current board, turning it on
* if `onoff' is 1, and off if `onoff' is 0.
*/
void
place(shape, pos, onoff)
struct shape *shape;
register int pos, onoff;
{
register int *o = shape->off;
board[pos] = onoff;
board[pos + *o++] = onoff;
board[pos + *o++] = onoff;
board[pos + *o] = onoff;
}
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