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knight.c
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/**************************************************************************** * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ****************************************************************************/ /* * Knight's Tour - a brain game * * The original of this game was anonymous. It had an unbelievably bogus * interface, you actually had to enter square coordinates! Redesign by * Eric S. Raymond <esr@snark.thyrsus.com> July 22 1995. Mouse support * added September 20th 1995. * * $Id: knight.c,v 1.36 2013/02/16 19:53:08 tom Exp $ */ #include <test.priv.h> /* board size */ #define BDEPTH 8 #define BWIDTH 8 /* where to start the instructions */ #define INSTRY 2 #define INSTRX 35 /* corner of board */ #define BOARDY 2 #define BOARDX 0 /* notification line */ #define NOTIFYY 21 /* virtual color values */ #define TRAIL_COLOR 1 #define PLUS_COLOR 2 #define MINUS_COLOR 3 #define CX(x) (2 + 4 * (x)) #define CY(y) (1 + 2 * (y)) #define cellmove(y, x) wmove(boardwin, CY(y), CX(x)) #define CXINV(x) (((x) - 1) / 4) #define CYINV(y) (((y) - 2) / 2) typedef struct { short x, y; } cell; static WINDOW *boardwin; /* the board window */ static WINDOW *helpwin; /* the help window */ static WINDOW *msgwin; /* the message window */ static cell history[BDEPTH * BWIDTH + 1]; /* choice history */ static chtype minus = '-'; /* possible-move character */ static chtype oldch; static chtype plus = '+'; /* cursor hot-spot character */ static chtype trail = '#'; /* trail character */ static int movecount; /* count of moves so far */ static int trialcount; /* count of trials so far */ static short board[BDEPTH][BWIDTH]; /* the squares */ /* *INDENT-OFF* */ static const struct { int y; int x; } offsets[] = { { 2, 1 }, { 1, 2 }, { -1, 2 }, { -2, 1 }, { -2, -1 }, { -1, -2 }, { 1, -2 }, { 2, -1 }, }; /* *INDENT-ON* */ static void init_program(void) { setlocale(LC_ALL, ""); srand((unsigned) getpid()); initscr(); cbreak(); /* immediate char return */ noecho(); /* no immediate echo */ boardwin = newwin(BDEPTH * 2 + 1, BWIDTH * 4 + 1, BOARDY, BOARDX); helpwin = newwin(0, 0, INSTRY, INSTRX); msgwin = newwin(1, INSTRX - 1, NOTIFYY, 0); scrollok(msgwin, TRUE); keypad(boardwin, TRUE); if (has_colors()) { int bg = COLOR_BLACK; start_color(); #if HAVE_USE_DEFAULT_COLORS if (use_default_colors() == OK) bg = -1; #endif (void) init_pair(TRAIL_COLOR, (short) COLOR_CYAN, (short) bg); (void) init_pair(PLUS_COLOR, (short) COLOR_RED, (short) bg); (void) init_pair(MINUS_COLOR, (short) COLOR_GREEN, (short) bg); trail |= (chtype) COLOR_PAIR(TRAIL_COLOR); plus |= (chtype) COLOR_PAIR(PLUS_COLOR); minus |= (chtype) COLOR_PAIR(MINUS_COLOR); } #ifdef NCURSES_MOUSE_VERSION (void) mousemask(BUTTON1_CLICKED, (mmask_t *) NULL); #endif /* NCURSES_MOUSE_VERSION */ #if defined(PDCURSES) mouse_set(BUTTON1_RELEASED); #endif oldch = minus; } static void help1(void) /* game explanation -- initial help screen */ { (void) waddstr(helpwin, "Knight's move is a solitaire puzzle. Your\n"); (void) waddstr(helpwin, "objective is to visit each square of the \n"); (void) waddstr(helpwin, "chessboard exactly once by making knight's\n"); (void) waddstr(helpwin, "moves (one square right or left followed \n"); (void) waddstr(helpwin, "by two squares up or down, or two squares \n"); (void) waddstr(helpwin, "right or left followed by one square up or\n"); (void) waddstr(helpwin, "down). You may start anywhere.\n\n"); (void) waddstr(helpwin, "Use arrow keys to move the cursor around.\n"); (void) waddstr(helpwin, "When you want to move your knight to the \n"); (void) waddstr(helpwin, "cursor location, press <space> or Enter.\n"); (void) waddstr(helpwin, "Illegal moves will be rejected with an \n"); (void) waddstr(helpwin, "audible beep.\n\n"); (void) waddstr(helpwin, "The program will detect if you solve the\n"); (void) waddstr(helpwin, "puzzle; also inform you when you run out\n"); (void) waddstr(helpwin, "of legal moves.\n\n"); MvWAddStr(helpwin, NOTIFYY - INSTRY, 0, "Press `?' to go to keystroke help."); } static void help2(void) /* keystroke help screen */ { (void) waddstr(helpwin, "Possible moves are shown with `-'.\n\n"); (void) waddstr(helpwin, "You can move around with the arrow keys or\n"); (void) waddstr(helpwin, "with the rogue/hack movement keys. Other\n"); (void) waddstr(helpwin, "commands allow you to undo moves or redraw.\n"); (void) waddstr(helpwin, "Your mouse may work; try left-button to\n"); (void) waddstr(helpwin, "move to the square under the pointer.\n\n"); (void) waddstr(helpwin, "x,q -- exit y k u 7 8 9\n"); (void) waddstr(helpwin, "r -- redraw screen \\|/ \\|/ \n"); (void) waddstr(helpwin, "bksp -- undo move h-+-l 4-+-6\n"); (void) waddstr(helpwin, "a -- autojump /|\\ /|\\ \n"); (void) waddstr(helpwin, " b j n 1 2 3\n"); (void) waddstr(helpwin, "\nYou can place your knight on the selected\n"); (void) waddstr(helpwin, "square with spacebar, Enter, or the keypad\n"); (void) waddstr(helpwin, "center key. Use F/B to review the path.\n"); MvWAddStr(helpwin, NOTIFYY - INSTRY, 0, "Press `?' to go to game explanation"); } static void show_help(bool * keyhelp) { werase(helpwin); if (*keyhelp) { help1(); *keyhelp = FALSE; } else { help2(); *keyhelp = TRUE; } wrefresh(helpwin); } static bool chksqr(int r1, int c1) { if ((r1 < 0) || (r1 > BDEPTH - 1)) return (FALSE); if ((c1 < 0) || (c1 > BWIDTH - 1)) return (FALSE); return ((!board[r1][c1]) ? TRUE : FALSE); } static bool chkmoves(int rw, int col) /* check to see if valid moves are available */ { unsigned n; for (n = 0; n < SIZEOF(offsets); n++) if (chksqr(rw + offsets[n].y, col + offsets[n].x)) return (TRUE); return (FALSE); } static void dosquares(void) { int i, j; MvAddStr(0, 20, "KNIGHT'S MOVE -- a logical solitaire"); move(BOARDY, BOARDX); waddch(boardwin, ACS_ULCORNER); for (j = 0; j < 7; j++) { waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_TTEE); } waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_URCORNER); for (i = 1; i < BDEPTH; i++) { move(BOARDY + i * 2 - 1, BOARDX); waddch(boardwin, ACS_VLINE); for (j = 0; j < BWIDTH; j++) { waddch(boardwin, ' '); waddch(boardwin, ' '); waddch(boardwin, ' '); waddch(boardwin, ACS_VLINE); } move(BOARDY + i * 2, BOARDX); waddch(boardwin, ACS_LTEE); for (j = 0; j < BWIDTH - 1; j++) { waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_PLUS); } waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_RTEE); } move(BOARDY + i * 2 - 1, BOARDX); waddch(boardwin, ACS_VLINE); for (j = 0; j < BWIDTH; j++) { waddch(boardwin, ' '); waddch(boardwin, ' '); waddch(boardwin, ' '); waddch(boardwin, ACS_VLINE); } move(BOARDY + i * 2, BOARDX); waddch(boardwin, ACS_LLCORNER); for (j = 0; j < BWIDTH - 1; j++) { waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_BTEE); } waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_HLINE); waddch(boardwin, ACS_LRCORNER); } static void mark_possibles(int prow, int pcol, chtype mark) { unsigned n; for (n = 0; n < SIZEOF(offsets); n++) { if (chksqr(prow + offsets[n].y, pcol + offsets[n].x)) { cellmove(prow + offsets[n].y, pcol + offsets[n].x); waddch(boardwin, mark); } } } static bool find_next_move(int *y, int *x) { unsigned j, k; int found = -1; int first = -1; int next = -1; int oldy, oldx; int newy, newx; bool result = FALSE; if (movecount > 1) { oldy = history[movecount - 1].y; oldx = history[movecount - 1].x; for (j = 0; j < SIZEOF(offsets) * 2; j++) { k = j % SIZEOF(offsets); newy = oldy + offsets[k].y; newx = oldx + offsets[k].x; if (chksqr(newy, newx)) { if (first < 0) first = (int) k; if (newy == *y && newx == *x) { found = (int) k; } else if (found >= 0) { next = (int) k; break; } } } if (found < 0) next = first; if (next >= 0) { *y = oldy + offsets[next].y; *x = oldx + offsets[next].x; } result = TRUE; } return result; } static void count_next_moves(int y, int x) { int count = 0; unsigned j; wprintw(msgwin, "\nMove %d", movecount); for (j = 0; j < SIZEOF(offsets); j++) { int newy = y + offsets[j].y; int newx = x + offsets[j].x; if (chksqr(newy, newx)) { ++count; } } wprintw(msgwin, ", gives %d choices", count); wclrtoeol(msgwin); } static void unmarkcell(int row, int column) { cellmove(row, column); waddch(boardwin, '\b'); waddch(boardwin, ' '); waddch(boardwin, minus); waddch(boardwin, ' '); } static void markcell(chtype tchar, int row, int column) { cellmove(row, column); waddch(boardwin, '\b'); waddch(boardwin, tchar); waddch(boardwin, tchar); waddch(boardwin, tchar); } static void drawmove(chtype tchar, int oldy, int oldx, int row, int column) /* place the stars, update board & currents */ { if (movecount <= 1) { int i, j; for (i = 0; i < BDEPTH; i++) { for (j = 0; j < BWIDTH; j++) { if (movecount == 0) { unmarkcell(i, j); } else { cellmove(i, j); if (winch(boardwin) == minus) waddch(boardwin, movecount ? ' ' : minus); } } } } else { markcell(tchar, oldy, oldx); mark_possibles(oldy, oldx, ' '); } if (row >= 0 && column >= 0) { markcell(trail, row, column); mark_possibles(row, column, minus); board[row][column] = TRUE; } wprintw(msgwin, "\nMove %d", movecount); if (trialcount != movecount) wprintw(msgwin, " (%d tries)", trialcount); wclrtoeol(msgwin); } static int iabs(int num) { if (num < 0) return (-num); else return (num); } static bool evalmove(int row, int column) /* evaluate move */ { if (movecount == 1) return (TRUE); else if (board[row][column] == TRUE) { waddstr(msgwin, "\nYou've already been there."); return (FALSE); } else { int rdif = iabs(row - history[movecount - 1].y); int cdif = iabs(column - history[movecount - 1].x); if (!((rdif == 1) && (cdif == 2)) && !((rdif == 2) && (cdif == 1))) { waddstr(msgwin, "\nThat's not a legal knight's move."); return (FALSE); } } return (TRUE); } static int completed(void) { int i, j, count = 0; for (i = 0; i < BDEPTH; i++) for (j = 0; j < BWIDTH; j++) if (board[i][j] != 0) count += 1; return (count == (BWIDTH * BDEPTH) ? -1 : count); } static void no_previous_move(void) { waddstr(msgwin, "\nNo previous move."); beep(); } static void play(void) /* play the game */ { bool keyhelp; /* TRUE if keystroke help is up */ int i, j, count; int lastcol = 0; /* last location visited */ int lastrow = 0; int ny = 0, nx = 0; int review = 0; /* review history */ int rw = 0, col = 0; /* current row and column */ do { /* clear screen and draw board */ werase(boardwin); werase(helpwin); werase(msgwin); dosquares(); help1(); wnoutrefresh(stdscr); wnoutrefresh(helpwin); wnoutrefresh(msgwin); wnoutrefresh(boardwin); doupdate(); movecount = 0; for (i = 0; i < BDEPTH; i++) { for (j = 0; j < BWIDTH; j++) { board[i][j] = FALSE; unmarkcell(i, j); } } memset(history, 0, sizeof(history)); history[0].y = history[0].x = -1; history[1].y = history[1].x = -1; lastrow = lastcol = -2; movecount = 1; trialcount = 1; keyhelp = FALSE; show_help(&keyhelp); for (;;) { if (rw != lastrow || col != lastcol) { if (lastrow >= 0 && lastcol >= 0) { cellmove(lastrow, lastcol); if (board[lastrow][lastcol]) waddch(boardwin, trail); else waddch(boardwin, oldch); } cellmove(rw, col); oldch = winch(boardwin); lastrow = rw; lastcol = col; } cellmove(rw, col); waddch(boardwin, plus); cellmove(rw, col); wrefresh(msgwin); switch (wgetch(boardwin)) { case 'k': case '8': case KEY_UP: ny = rw + BDEPTH - 1; nx = col; break; case 'j': case '2': case KEY_DOWN: ny = rw + 1; nx = col; break; case 'h': case '4': case KEY_LEFT: ny = rw; nx = col + BWIDTH - 1; break; case 'l': case '6': case KEY_RIGHT: ny = rw; nx = col + 1; break; case 'y': case '7': case KEY_A1: ny = rw + BDEPTH - 1; nx = col + BWIDTH - 1; break; case 'b': case '1': case KEY_C1: ny = rw + 1; nx = col + BWIDTH - 1; break; case 'u': case '9': case KEY_A3: ny = rw + BDEPTH - 1; nx = col + 1; break; case 'n': case '3': case KEY_C3: ny = rw + 1; nx = col + 1; break; #ifdef KEY_MOUSE case KEY_MOUSE: #ifdef NCURSES_MOUSE_VERSION { MEVENT myevent; getmouse(&myevent); if (myevent.y >= CY(0) && myevent.y <= CY(BDEPTH) && myevent.x >= CX(0) && myevent.x <= CX(BWIDTH)) { nx = CXINV(myevent.x); ny = CYINV(myevent.y); ungetch('\n'); break; } else { beep(); continue; } } #endif /* NCURSES_MOUSE_VERSION */ #ifdef PDCURSES { int test_y, test_x; request_mouse_pos(); test_y = MOUSE_Y_POS + 0; test_x = MOUSE_X_POS + 1; if (test_y >= CY(0) && test_y <= CY(BDEPTH) && test_x >= CX(0) && test_x <= CX(BWIDTH)) { ny = CYINV(test_y); nx = CXINV(test_x); wmove(helpwin, 0, 0); wrefresh(helpwin); ungetch('\n'); } break; } #endif /* PDCURSES */ #endif /* KEY_MOUSE */ case KEY_B2: case '\n': case ' ': review = 0; if (evalmove(rw, col)) { drawmove(trail, history[movecount - 1].y, history[movecount - 1].x, rw, col); history[movecount].y = (short) rw; history[movecount].x = (short) col; movecount++; trialcount++; if (!chkmoves(rw, col)) { if (completed() < 0) { waddstr(msgwin, "\nYou won."); } else { waddstr(msgwin, "\nNo further moves are possible."); } } } else { beep(); } break; case KEY_UNDO: case KEY_BACKSPACE: case '\b': review = 0; if (movecount <= 0) { no_previous_move(); } else if (movecount <= 1) { ny = history[movecount].y; nx = history[movecount].x; if (nx < 0 || ny < 0) { ny = (lastrow >= 0) ? lastrow : 0; nx = (lastcol >= 0) ? lastcol : 0; } movecount = 0; board[ny][nx] = FALSE; oldch = minus; drawmove(' ', ny, nx, -1, -1); movecount = 1; trialcount = 1; no_previous_move(); } else { int oldy = history[movecount - 1].y; int oldx = history[movecount - 1].x; if (!board[rw][col]) { cellmove(rw, col); waddch(boardwin, ' '); } board[oldy][oldx] = FALSE; --movecount; ny = history[movecount - 1].y; nx = history[movecount - 1].x; if (nx < 0 || ny < 0) { ny = oldy; nx = oldx; } drawmove(' ', oldy, oldx, ny, nx); /* avoid problems if we just changed the current cell */ cellmove(lastrow, lastcol); oldch = winch(boardwin); } break; case 'a': nx = col; ny = rw; if (find_next_move(&ny, &nx)) count_next_moves(ny, nx); else beep(); break; case 'F': if (review > 0) { review--; ny = history[movecount - review - 1].y; nx = history[movecount - review - 1].x; } else { beep(); } break; case 'B': if (review < movecount - 2) { review++; ny = history[movecount - review - 1].y; nx = history[movecount - review - 1].x; } else { beep(); } break; case KEY_REDO: case '\f': case 'r': clearok(curscr, TRUE); wnoutrefresh(stdscr); wnoutrefresh(boardwin); wnoutrefresh(msgwin); wnoutrefresh(helpwin); doupdate(); break; case 'q': case 'x': goto dropout; case '?': show_help(&keyhelp); break; default: beep(); break; } col = nx % BWIDTH; rw = ny % BDEPTH; } dropout: if ((count = completed()) < 0) wprintw(msgwin, "\nYou won. Care to try again? "); else wprintw(msgwin, "\n%d squares filled. Try again? ", count); wclrtoeol(msgwin); } while (tolower(wgetch(msgwin)) == 'y'); } int main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED) { init_program(); play(); endwin(); ExitProgram(EXIT_SUCCESS); } /* knight.c ends here */
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