1*57275Sbostic /*- 2*57275Sbostic * Copyright (c) 1992 The Regents of the University of California. 3*57275Sbostic * All rights reserved. 4*57275Sbostic * 5*57275Sbostic * %sccs.include.redist.c% 6*57275Sbostic * 7*57275Sbostic * @(#)shapes.c 5.1 (Berkeley) 12/22/92 8*57275Sbostic */ 9*57275Sbostic 10*57275Sbostic /* 11*57275Sbostic * Tetris shapes and related routines. 12*57275Sbostic * 13*57275Sbostic * Note that the first 7 are `well known'. 14*57275Sbostic */ 15*57275Sbostic 16*57275Sbostic #include <sys/cdefs.h> 17*57275Sbostic #include "tetris.h" 18*57275Sbostic 19*57275Sbostic #define TL -B_COLS-1 /* top left */ 20*57275Sbostic #define TC -B_COLS /* top center */ 21*57275Sbostic #define TR -B_COLS+1 /* top right */ 22*57275Sbostic #define ML -1 /* middle left */ 23*57275Sbostic #define MR 1 /* middle right */ 24*57275Sbostic #define BL B_COLS-1 /* bottom left */ 25*57275Sbostic #define BC B_COLS /* bottom center */ 26*57275Sbostic #define BR B_COLS+1 /* bottom right */ 27*57275Sbostic 28*57275Sbostic struct shape shapes[] = { 29*57275Sbostic /* 0*/ 7, TL, TC, MR, 30*57275Sbostic /* 1*/ 8, TC, TR, ML, 31*57275Sbostic /* 2*/ 9, ML, MR, BC, 32*57275Sbostic /* 3*/ 3, TL, TC, ML, 33*57275Sbostic /* 4*/ 12, ML, BL, MR, 34*57275Sbostic /* 5*/ 15, ML, BR, MR, 35*57275Sbostic /* 6*/ 18, ML, MR, /* sticks out */ 2, 36*57275Sbostic /* 7*/ 0, TC, ML, BL, 37*57275Sbostic /* 8*/ 1, TC, MR, BR, 38*57275Sbostic /* 9*/ 10, TC, MR, BC, 39*57275Sbostic /*10*/ 11, TC, ML, MR, 40*57275Sbostic /*11*/ 2, TC, ML, BC, 41*57275Sbostic /*12*/ 13, TC, BC, BR, 42*57275Sbostic /*13*/ 14, TR, ML, MR, 43*57275Sbostic /*14*/ 4, TL, TC, BC, 44*57275Sbostic /*15*/ 16, TR, TC, BC, 45*57275Sbostic /*16*/ 17, TL, MR, ML, 46*57275Sbostic /*17*/ 5, TC, BC, BL, 47*57275Sbostic /*18*/ 6, TC, BC, /* sticks out */ 2*B_COLS, 48*57275Sbostic }; 49*57275Sbostic 50*57275Sbostic /* 51*57275Sbostic * Return true iff the given shape fits in the given position, 52*57275Sbostic * taking the current board into account. 53*57275Sbostic */ 54*57275Sbostic int 55*57275Sbostic fits_in(shape, pos) 56*57275Sbostic struct shape *shape; 57*57275Sbostic register int pos; 58*57275Sbostic { 59*57275Sbostic register int *o = shape->off; 60*57275Sbostic 61*57275Sbostic if (board[pos] || board[pos + *o++] || board[pos + *o++] || 62*57275Sbostic board[pos + *o]) 63*57275Sbostic return 0; 64*57275Sbostic return 1; 65*57275Sbostic } 66*57275Sbostic 67*57275Sbostic /* 68*57275Sbostic * Write the given shape into the current board, turning it on 69*57275Sbostic * if `onoff' is 1, and off if `onoff' is 0. 70*57275Sbostic */ 71*57275Sbostic void 72*57275Sbostic place(shape, pos, onoff) 73*57275Sbostic struct shape *shape; 74*57275Sbostic register int pos, onoff; 75*57275Sbostic { 76*57275Sbostic register int *o = shape->off; 77*57275Sbostic 78*57275Sbostic board[pos] = onoff; 79*57275Sbostic board[pos + *o++] = onoff; 80*57275Sbostic board[pos + *o++] = onoff; 81*57275Sbostic board[pos + *o] = onoff; 82*57275Sbostic } 83