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29 * Knight's Tour - a brain game
31 * The original of this game was anonymous. It had an unbelievably bogus
32 * interface, you actually had to enter square coordinates! Redesign by
33 * Eric S. Raymond <esr@snark.thyrsus.com> July 22 1995. Mouse support
34 * added September 20th 1995.
36 * $Id: knight.c,v 1.36 2013/02/16 19:53:08 tom Exp $
39 #include <test.priv.h>
45 /* where to start the instructions */
53 /* notification line */
56 /* virtual color values */
61 #define CX(x) (2 + 4 * (x))
62 #define CY(y) (1 + 2 * (y))
63 #define cellmove(y, x) wmove(boardwin, CY(y), CX(x))
64 #define CXINV(x) (((x) - 1) / 4)
65 #define CYINV(y) (((y) - 2) / 2)
71 static WINDOW *boardwin; /* the board window */
72 static WINDOW *helpwin; /* the help window */
73 static WINDOW *msgwin; /* the message window */
74 static cell history[BDEPTH * BWIDTH + 1]; /* choice history */
75 static chtype minus = '-'; /* possible-move character */
77 static chtype plus = '+'; /* cursor hot-spot character */
78 static chtype trail = '#'; /* trail character */
79 static int movecount; /* count of moves so far */
80 static int trialcount; /* count of trials so far */
81 static short board[BDEPTH][BWIDTH]; /* the squares */
101 setlocale(LC_ALL, "");
103 srand((unsigned) getpid());
105 cbreak(); /* immediate char return */
106 noecho(); /* no immediate echo */
107 boardwin = newwin(BDEPTH * 2 + 1, BWIDTH * 4 + 1, BOARDY, BOARDX);
108 helpwin = newwin(0, 0, INSTRY, INSTRX);
109 msgwin = newwin(1, INSTRX - 1, NOTIFYY, 0);
110 scrollok(msgwin, TRUE);
111 keypad(boardwin, TRUE);
114 int bg = COLOR_BLACK;
117 #if HAVE_USE_DEFAULT_COLORS
118 if (use_default_colors() == OK)
122 (void) init_pair(TRAIL_COLOR, (short) COLOR_CYAN, (short) bg);
123 (void) init_pair(PLUS_COLOR, (short) COLOR_RED, (short) bg);
124 (void) init_pair(MINUS_COLOR, (short) COLOR_GREEN, (short) bg);
126 trail |= (chtype) COLOR_PAIR(TRAIL_COLOR);
127 plus |= (chtype) COLOR_PAIR(PLUS_COLOR);
128 minus |= (chtype) COLOR_PAIR(MINUS_COLOR);
130 #ifdef NCURSES_MOUSE_VERSION
131 (void) mousemask(BUTTON1_CLICKED, (mmask_t *) NULL);
132 #endif /* NCURSES_MOUSE_VERSION */
133 #if defined(PDCURSES)
134 mouse_set(BUTTON1_RELEASED);
142 /* game explanation -- initial help screen */
144 (void) waddstr(helpwin, "Knight's move is a solitaire puzzle. Your\n");
145 (void) waddstr(helpwin, "objective is to visit each square of the \n");
146 (void) waddstr(helpwin, "chessboard exactly once by making knight's\n");
147 (void) waddstr(helpwin, "moves (one square right or left followed \n");
148 (void) waddstr(helpwin, "by two squares up or down, or two squares \n");
149 (void) waddstr(helpwin, "right or left followed by one square up or\n");
150 (void) waddstr(helpwin, "down). You may start anywhere.\n\n");
152 (void) waddstr(helpwin, "Use arrow keys to move the cursor around.\n");
153 (void) waddstr(helpwin, "When you want to move your knight to the \n");
154 (void) waddstr(helpwin, "cursor location, press <space> or Enter.\n");
155 (void) waddstr(helpwin, "Illegal moves will be rejected with an \n");
156 (void) waddstr(helpwin, "audible beep.\n\n");
157 (void) waddstr(helpwin, "The program will detect if you solve the\n");
158 (void) waddstr(helpwin, "puzzle; also inform you when you run out\n");
159 (void) waddstr(helpwin, "of legal moves.\n\n");
161 MvWAddStr(helpwin, NOTIFYY - INSTRY, 0,
162 "Press `?' to go to keystroke help.");
167 /* keystroke help screen */
169 (void) waddstr(helpwin, "Possible moves are shown with `-'.\n\n");
171 (void) waddstr(helpwin, "You can move around with the arrow keys or\n");
172 (void) waddstr(helpwin, "with the rogue/hack movement keys. Other\n");
173 (void) waddstr(helpwin, "commands allow you to undo moves or redraw.\n");
174 (void) waddstr(helpwin, "Your mouse may work; try left-button to\n");
175 (void) waddstr(helpwin, "move to the square under the pointer.\n\n");
177 (void) waddstr(helpwin, "x,q -- exit y k u 7 8 9\n");
178 (void) waddstr(helpwin, "r -- redraw screen \\|/ \\|/ \n");
179 (void) waddstr(helpwin, "bksp -- undo move h-+-l 4-+-6\n");
180 (void) waddstr(helpwin, "a -- autojump /|\\ /|\\ \n");
181 (void) waddstr(helpwin, " b j n 1 2 3\n");
183 (void) waddstr(helpwin, "\nYou can place your knight on the selected\n");
184 (void) waddstr(helpwin, "square with spacebar, Enter, or the keypad\n");
185 (void) waddstr(helpwin, "center key. Use F/B to review the path.\n");
187 MvWAddStr(helpwin, NOTIFYY - INSTRY, 0,
188 "Press `?' to go to game explanation");
192 show_help(bool * keyhelp)
206 chksqr(int r1, int c1)
208 if ((r1 < 0) || (r1 > BDEPTH - 1))
210 if ((c1 < 0) || (c1 > BWIDTH - 1))
212 return ((!board[r1][c1]) ? TRUE : FALSE);
216 chkmoves(int rw, int col)
217 /* check to see if valid moves are available */
221 for (n = 0; n < SIZEOF(offsets); n++)
222 if (chksqr(rw + offsets[n].y, col + offsets[n].x))
232 MvAddStr(0, 20, "KNIGHT'S MOVE -- a logical solitaire");
234 move(BOARDY, BOARDX);
235 waddch(boardwin, ACS_ULCORNER);
236 for (j = 0; j < 7; j++) {
237 waddch(boardwin, ACS_HLINE);
238 waddch(boardwin, ACS_HLINE);
239 waddch(boardwin, ACS_HLINE);
240 waddch(boardwin, ACS_TTEE);
242 waddch(boardwin, ACS_HLINE);
243 waddch(boardwin, ACS_HLINE);
244 waddch(boardwin, ACS_HLINE);
245 waddch(boardwin, ACS_URCORNER);
247 for (i = 1; i < BDEPTH; i++) {
248 move(BOARDY + i * 2 - 1, BOARDX);
249 waddch(boardwin, ACS_VLINE);
250 for (j = 0; j < BWIDTH; j++) {
251 waddch(boardwin, ' ');
252 waddch(boardwin, ' ');
253 waddch(boardwin, ' ');
254 waddch(boardwin, ACS_VLINE);
256 move(BOARDY + i * 2, BOARDX);
257 waddch(boardwin, ACS_LTEE);
258 for (j = 0; j < BWIDTH - 1; j++) {
259 waddch(boardwin, ACS_HLINE);
260 waddch(boardwin, ACS_HLINE);
261 waddch(boardwin, ACS_HLINE);
262 waddch(boardwin, ACS_PLUS);
264 waddch(boardwin, ACS_HLINE);
265 waddch(boardwin, ACS_HLINE);
266 waddch(boardwin, ACS_HLINE);
267 waddch(boardwin, ACS_RTEE);
270 move(BOARDY + i * 2 - 1, BOARDX);
271 waddch(boardwin, ACS_VLINE);
272 for (j = 0; j < BWIDTH; j++) {
273 waddch(boardwin, ' ');
274 waddch(boardwin, ' ');
275 waddch(boardwin, ' ');
276 waddch(boardwin, ACS_VLINE);
279 move(BOARDY + i * 2, BOARDX);
280 waddch(boardwin, ACS_LLCORNER);
281 for (j = 0; j < BWIDTH - 1; j++) {
282 waddch(boardwin, ACS_HLINE);
283 waddch(boardwin, ACS_HLINE);
284 waddch(boardwin, ACS_HLINE);
285 waddch(boardwin, ACS_BTEE);
287 waddch(boardwin, ACS_HLINE);
288 waddch(boardwin, ACS_HLINE);
289 waddch(boardwin, ACS_HLINE);
290 waddch(boardwin, ACS_LRCORNER);
294 mark_possibles(int prow, int pcol, chtype mark)
298 for (n = 0; n < SIZEOF(offsets); n++) {
299 if (chksqr(prow + offsets[n].y, pcol + offsets[n].x)) {
300 cellmove(prow + offsets[n].y, pcol + offsets[n].x);
301 waddch(boardwin, mark);
307 find_next_move(int *y, int *x)
318 oldy = history[movecount - 1].y;
319 oldx = history[movecount - 1].x;
320 for (j = 0; j < SIZEOF(offsets) * 2; j++) {
321 k = j % SIZEOF(offsets);
322 newy = oldy + offsets[k].y;
323 newx = oldx + offsets[k].x;
324 if (chksqr(newy, newx)) {
330 } else if (found >= 0) {
339 *y = oldy + offsets[next].y;
340 *x = oldx + offsets[next].x;
348 count_next_moves(int y, int x)
353 wprintw(msgwin, "\nMove %d", movecount);
354 for (j = 0; j < SIZEOF(offsets); j++) {
355 int newy = y + offsets[j].y;
356 int newx = x + offsets[j].x;
357 if (chksqr(newy, newx)) {
361 wprintw(msgwin, ", gives %d choices", count);
366 unmarkcell(int row, int column)
368 cellmove(row, column);
369 waddch(boardwin, '\b');
370 waddch(boardwin, ' ');
371 waddch(boardwin, minus);
372 waddch(boardwin, ' ');
376 markcell(chtype tchar, int row, int column)
378 cellmove(row, column);
379 waddch(boardwin, '\b');
380 waddch(boardwin, tchar);
381 waddch(boardwin, tchar);
382 waddch(boardwin, tchar);
386 drawmove(chtype tchar, int oldy, int oldx, int row, int column)
387 /* place the stars, update board & currents */
389 if (movecount <= 1) {
392 for (i = 0; i < BDEPTH; i++) {
393 for (j = 0; j < BWIDTH; j++) {
394 if (movecount == 0) {
398 if (winch(boardwin) == minus)
399 waddch(boardwin, movecount ? ' ' : minus);
404 markcell(tchar, oldy, oldx);
405 mark_possibles(oldy, oldx, ' ');
408 if (row >= 0 && column >= 0) {
409 markcell(trail, row, column);
410 mark_possibles(row, column, minus);
411 board[row][column] = TRUE;
414 wprintw(msgwin, "\nMove %d", movecount);
415 if (trialcount != movecount)
416 wprintw(msgwin, " (%d tries)", trialcount);
430 evalmove(int row, int column)
435 else if (board[row][column] == TRUE) {
436 waddstr(msgwin, "\nYou've already been there.");
439 int rdif = iabs(row - history[movecount - 1].y);
440 int cdif = iabs(column - history[movecount - 1].x);
442 if (!((rdif == 1) && (cdif == 2)) && !((rdif == 2) && (cdif == 1))) {
443 waddstr(msgwin, "\nThat's not a legal knight's move.");
456 for (i = 0; i < BDEPTH; i++)
457 for (j = 0; j < BWIDTH; j++)
458 if (board[i][j] != 0)
460 return (count == (BWIDTH * BDEPTH) ? -1 : count);
464 no_previous_move(void)
466 waddstr(msgwin, "\nNo previous move.");
474 bool keyhelp; /* TRUE if keystroke help is up */
476 int lastcol = 0; /* last location visited */
479 int review = 0; /* review history */
480 int rw = 0, col = 0; /* current row and column */
483 /* clear screen and draw board */
489 wnoutrefresh(stdscr);
490 wnoutrefresh(helpwin);
491 wnoutrefresh(msgwin);
492 wnoutrefresh(boardwin);
496 for (i = 0; i < BDEPTH; i++) {
497 for (j = 0; j < BWIDTH; j++) {
502 memset(history, 0, sizeof(history));
503 history[0].y = history[0].x = -1;
504 history[1].y = history[1].x = -1;
505 lastrow = lastcol = -2;
512 if (rw != lastrow || col != lastcol) {
513 if (lastrow >= 0 && lastcol >= 0) {
514 cellmove(lastrow, lastcol);
515 if (board[lastrow][lastcol])
516 waddch(boardwin, trail);
518 waddch(boardwin, oldch);
522 oldch = winch(boardwin);
528 waddch(boardwin, plus);
533 switch (wgetch(boardwin)) {
537 ny = rw + BDEPTH - 1;
550 nx = col + BWIDTH - 1;
561 ny = rw + BDEPTH - 1;
562 nx = col + BWIDTH - 1;
568 nx = col + BWIDTH - 1;
573 ny = rw + BDEPTH - 1;
585 #ifdef NCURSES_MOUSE_VERSION
590 if (myevent.y >= CY(0) && myevent.y <= CY(BDEPTH)
591 && myevent.x >= CX(0) && myevent.x <= CX(BWIDTH)) {
592 nx = CXINV(myevent.x);
593 ny = CYINV(myevent.y);
601 #endif /* NCURSES_MOUSE_VERSION */
606 test_y = MOUSE_Y_POS + 0;
607 test_x = MOUSE_X_POS + 1;
608 if (test_y >= CY(0) && test_y <= CY(BDEPTH)
609 && test_x >= CX(0) && test_x <= CX(BWIDTH)) {
612 wmove(helpwin, 0, 0);
618 #endif /* PDCURSES */
619 #endif /* KEY_MOUSE */
625 if (evalmove(rw, col)) {
627 history[movecount - 1].y,
628 history[movecount - 1].x,
630 history[movecount].y = (short) rw;
631 history[movecount].x = (short) col;
635 if (!chkmoves(rw, col)) {
636 if (completed() < 0) {
637 waddstr(msgwin, "\nYou won.");
640 "\nNo further moves are possible.");
652 if (movecount <= 0) {
654 } else if (movecount <= 1) {
655 ny = history[movecount].y;
656 nx = history[movecount].x;
657 if (nx < 0 || ny < 0) {
658 ny = (lastrow >= 0) ? lastrow : 0;
659 nx = (lastcol >= 0) ? lastcol : 0;
662 board[ny][nx] = FALSE;
664 drawmove(' ', ny, nx, -1, -1);
669 int oldy = history[movecount - 1].y;
670 int oldx = history[movecount - 1].x;
672 if (!board[rw][col]) {
674 waddch(boardwin, ' ');
677 board[oldy][oldx] = FALSE;
679 ny = history[movecount - 1].y;
680 nx = history[movecount - 1].x;
681 if (nx < 0 || ny < 0) {
685 drawmove(' ', oldy, oldx, ny, nx);
687 /* avoid problems if we just changed the current cell */
688 cellmove(lastrow, lastcol);
689 oldch = winch(boardwin);
696 if (find_next_move(&ny, &nx))
697 count_next_moves(ny, nx);
705 ny = history[movecount - review - 1].y;
706 nx = history[movecount - review - 1].x;
713 if (review < movecount - 2) {
715 ny = history[movecount - review - 1].y;
716 nx = history[movecount - review - 1].x;
725 clearok(curscr, TRUE);
726 wnoutrefresh(stdscr);
727 wnoutrefresh(boardwin);
728 wnoutrefresh(msgwin);
729 wnoutrefresh(helpwin);
751 if ((count = completed()) < 0)
752 wprintw(msgwin, "\nYou won. Care to try again? ");
754 wprintw(msgwin, "\n%d squares filled. Try again? ", count);
757 (tolower(wgetch(msgwin)) == 'y');
761 main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
768 ExitProgram(EXIT_SUCCESS);
771 /* knight.c ends here */