703 lines
15 KiB
C
703 lines
15 KiB
C
/*
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* Knight's Tour - a brain game
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*
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* The original of this game was anonymous. It had an unbelievably bogus
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* interface, you actually had to enter square coordinates! Redesign by
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* Eric S. Raymond <esr@snark.thyrsus.com> July 22 1995. Mouse support
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* added September 20th 1995.
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*
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* $Id: knight.c,v 1.20 2000/10/29 00:51:51 tom Exp $
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*/
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#include <test.priv.h>
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#include <ctype.h>
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#include <signal.h>
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#include <string.h>
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/* board size */
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#define BDEPTH 8
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#define BWIDTH 8
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/* where to start the instructions */
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#define INSTRY 2
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#define INSTRX 35
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/* corner of board */
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#define BOARDY 2
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#define BOARDX 0
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/* notification line */
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#define NOTIFYY 21
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/* virtual color values */
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#define TRAIL_COLOR 1
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#define PLUS_COLOR 2
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#define MINUS_COLOR 3
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#define CX(x) (2 + 4 * (x))
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#define CY(y) (1 + 2 * (y))
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#define cellmove(y, x) wmove(boardwin, CY(y), CX(x))
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#define CXINV(x) (((x) - 1) / 4)
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#define CYINV(y) (((y) - 2) / 2)
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typedef struct {
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short x, y;
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} cell;
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static WINDOW *boardwin; /* the board window */
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static WINDOW *helpwin; /* the help window */
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static WINDOW *msgwin; /* the message window */
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static cell history[BDEPTH * BWIDTH + 1]; /* choice history */
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static chtype minus = '-'; /* possible-move character */
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static chtype oldch;
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static chtype plus = '+'; /* cursor hot-spot character */
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static chtype trail = '#'; /* trail character */
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static int movecount; /* count of moves so far */
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static int trialcount; /* count of trials so far */
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static short board[BDEPTH][BWIDTH]; /* the squares */
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/* *INDENT-OFF* */
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static const struct {
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int y;
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int x;
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} offsets[] = {
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{ 2, 1 },
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{ 1, 2 },
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{ -1, 2 },
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{ -2, 1 },
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{ -2, -1 },
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{ -1, -2 },
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{ 1, -2 },
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{ 2, -1 },
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};
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/* *INDENT-ON* */
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static void
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init_program(void)
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{
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srand((unsigned) getpid());
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initscr();
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cbreak(); /* immediate char return */
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noecho(); /* no immediate echo */
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boardwin = newwin(BDEPTH * 2 + 1, BWIDTH * 4 + 1, BOARDY, BOARDX);
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helpwin = newwin(0, 0, INSTRY, INSTRX);
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msgwin = newwin(1, INSTRX - 1, NOTIFYY, 0);
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scrollok(msgwin, TRUE);
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keypad(boardwin, TRUE);
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if (has_colors()) {
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int bg = COLOR_BLACK;
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start_color();
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#if HAVE_USE_DEFAULT_COLORS
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if (use_default_colors() == OK)
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bg = -1;
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#endif
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(void) init_pair(TRAIL_COLOR, COLOR_CYAN, bg);
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(void) init_pair(PLUS_COLOR, COLOR_RED, bg);
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(void) init_pair(MINUS_COLOR, COLOR_GREEN, bg);
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trail |= COLOR_PAIR(TRAIL_COLOR);
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plus |= COLOR_PAIR(PLUS_COLOR);
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minus |= COLOR_PAIR(MINUS_COLOR);
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}
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#ifdef NCURSES_MOUSE_VERSION
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(void) mousemask(BUTTON1_CLICKED, (mmask_t *) NULL);
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#endif /* NCURSES_MOUSE_VERSION */
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oldch = minus;
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}
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static void
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help1(void)
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/* game explanation -- initial help screen */
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{
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(void) waddstr(helpwin, "Knight's move is a solitaire puzzle. Your\n");
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(void) waddstr(helpwin, "objective is to visit each square of the \n");
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(void) waddstr(helpwin, "chessboard exactly once by making knight's\n");
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(void) waddstr(helpwin, "moves (one square right or left followed \n");
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(void) waddstr(helpwin, "by two squares up or down, or two squares \n");
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(void) waddstr(helpwin, "right or left followed by one square up or\n");
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(void) waddstr(helpwin, "down). You may start anywhere.\n\n");
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(void) waddstr(helpwin, "Use arrow keys to move the cursor around.\n");
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(void) waddstr(helpwin, "When you want to move your knight to the \n");
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(void) waddstr(helpwin, "cursor location, press <space> or Enter.\n");
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(void) waddstr(helpwin, "Illegal moves will be rejected with an \n");
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(void) waddstr(helpwin, "audible beep.\n\n");
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(void) waddstr(helpwin, "The program will detect if you solve the\n");
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(void) waddstr(helpwin, "puzzle; also inform you when you run out\n");
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(void) waddstr(helpwin, "of legal moves.\n\n");
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(void) mvwaddstr(helpwin, NOTIFYY - INSTRY, 0,
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"Press `?' to go to keystroke help.");
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}
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static void
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help2(void)
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/* keystroke help screen */
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{
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(void) waddstr(helpwin, "Possible moves are shown with `-'.\n\n");
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(void) waddstr(helpwin, "You can move around with the arrow keys or\n");
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(void) waddstr(helpwin, "with the rogue/hack movement keys. Other\n");
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(void) waddstr(helpwin, "commands allow you to undo moves or redraw.\n");
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(void) waddstr(helpwin, "Your mouse may work; try left-button to\n");
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(void) waddstr(helpwin, "move to the square under the pointer.\n\n");
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(void) waddstr(helpwin, "x,q -- exit y k u 7 8 9\n");
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(void) waddstr(helpwin, "r -- redraw screen \\|/ \\|/ \n");
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(void) waddstr(helpwin, "bksp -- undo move h-+-l 4-+-6\n");
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(void) waddstr(helpwin, "a -- autojump /|\\ /|\\ \n");
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(void) waddstr(helpwin, " b j n 1 2 3\n");
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(void) waddstr(helpwin, "\nYou can place your knight on the selected\n");
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(void) waddstr(helpwin, "square with spacebar, Enter, or the keypad\n");
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(void) waddstr(helpwin, "center key. Use F/B to review the path.\n");
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(void) mvwaddstr(helpwin, NOTIFYY - INSTRY, 0,
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"Press `?' to go to game explanation");
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}
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static void
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show_help(bool * keyhelp)
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{
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werase(helpwin);
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if (*keyhelp) {
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help1();
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*keyhelp = FALSE;
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} else {
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help2();
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*keyhelp = TRUE;
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}
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wrefresh(helpwin);
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}
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static bool
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chksqr(int r1, int c1)
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{
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if ((r1 < 0) || (r1 > BDEPTH - 1))
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return (FALSE);
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if ((c1 < 0) || (c1 > BWIDTH - 1))
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return (FALSE);
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return ((!board[r1][c1]) ? TRUE : FALSE);
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}
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static bool
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chkmoves(int rw, int col)
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/* check to see if valid moves are available */
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{
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unsigned n;
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for (n = 0; n < SIZEOF(offsets); n++)
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if (chksqr(rw + offsets[n].y, col + offsets[n].x))
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return (TRUE);
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return (FALSE);
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}
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static void
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dosquares(void)
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{
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int i, j;
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mvaddstr(0, 20, "KNIGHT'S MOVE -- a logical solitaire");
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move(BOARDY, BOARDX);
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waddch(boardwin, ACS_ULCORNER);
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for (j = 0; j < 7; j++) {
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_TTEE);
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}
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_URCORNER);
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for (i = 1; i < BDEPTH; i++) {
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move(BOARDY + i * 2 - 1, BOARDX);
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waddch(boardwin, ACS_VLINE);
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for (j = 0; j < BWIDTH; j++) {
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waddch(boardwin, ' ');
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waddch(boardwin, ' ');
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waddch(boardwin, ' ');
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waddch(boardwin, ACS_VLINE);
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}
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move(BOARDY + i * 2, BOARDX);
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waddch(boardwin, ACS_LTEE);
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for (j = 0; j < BWIDTH - 1; j++) {
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_PLUS);
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}
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_RTEE);
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}
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move(BOARDY + i * 2 - 1, BOARDX);
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waddch(boardwin, ACS_VLINE);
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for (j = 0; j < BWIDTH; j++) {
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waddch(boardwin, ' ');
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waddch(boardwin, ' ');
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waddch(boardwin, ' ');
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waddch(boardwin, ACS_VLINE);
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}
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move(BOARDY + i * 2, BOARDX);
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waddch(boardwin, ACS_LLCORNER);
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for (j = 0; j < BWIDTH - 1; j++) {
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_BTEE);
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}
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_HLINE);
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waddch(boardwin, ACS_LRCORNER);
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}
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static void
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mark_possibles(int prow, int pcol, chtype mark)
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{
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unsigned n;
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for (n = 0; n < SIZEOF(offsets); n++) {
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if (chksqr(prow + offsets[n].y, pcol + offsets[n].x)) {
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cellmove(prow + offsets[n].y, pcol + offsets[n].x);
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waddch(boardwin, mark);
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}
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}
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}
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static void
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find_next_move(int *y, int *x)
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{
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unsigned j, k;
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int found = -1;
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int first = -1;
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int next = 0;
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int oldy, oldx;
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int newy, newx;
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if (movecount > 1) {
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oldy = history[movecount - 1].y;
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oldx = history[movecount - 1].x;
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for (j = 0; j < SIZEOF(offsets) * 2; j++) {
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k = j % SIZEOF(offsets);
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newy = oldy + offsets[k].y;
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newx = oldx + offsets[k].x;
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if (chksqr(newy, newx)) {
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if (first < 0)
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first = k;
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if (newy == *y
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&& newx == *x) {
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found = k;
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} else if (found >= 0) {
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next = k;
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break;
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}
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}
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}
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if (found < 0)
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next = first;
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if (next >= 0) {
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*y = oldy + offsets[next].y;
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*x = oldx + offsets[next].x;
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}
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} else {
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beep();
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}
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}
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static void
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unmarkcell(int row, int column)
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{
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cellmove(row, column);
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waddch(boardwin, '\b');
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waddch(boardwin, ' ');
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waddch(boardwin, minus);
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waddch(boardwin, ' ');
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}
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static void
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markcell(chtype tchar, int row, int column)
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{
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cellmove(row, column);
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waddch(boardwin, '\b');
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waddch(boardwin, tchar);
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waddch(boardwin, tchar);
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waddch(boardwin, tchar);
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}
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static void
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drawmove(chtype tchar, int oldy, int oldx, int row, int column)
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/* place the stars, update board & currents */
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{
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if (movecount <= 1) {
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int i, j;
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for (i = 0; i < BDEPTH; i++) {
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for (j = 0; j < BWIDTH; j++) {
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if (movecount == 0) {
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unmarkcell(i, j);
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} else {
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cellmove(i, j);
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if (winch(boardwin) == minus)
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waddch(boardwin, movecount ? ' ' : minus);
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}
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}
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}
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} else {
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markcell(tchar, oldy, oldx);
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mark_possibles(oldy, oldx, ' ');
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}
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if (row != -1 && column != -1) {
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markcell(trail, row, column);
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mark_possibles(row, column, minus);
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board[row][column] = TRUE;
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}
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wprintw(msgwin, "\nMove %d", movecount);
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if (trialcount != movecount)
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wprintw(msgwin, " (%d tries)", trialcount);
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wclrtoeol(msgwin);
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}
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static int
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iabs(int num)
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{
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if (num < 0)
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return (-num);
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else
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return (num);
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}
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static bool
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evalmove(int row, int column)
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/* evaluate move */
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{
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if (movecount == 1)
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return (TRUE);
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else if (board[row][column] == TRUE) {
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waddstr(msgwin, "\nYou've already been there.");
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return (FALSE);
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} else {
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int rdif = iabs(row - history[movecount - 1].y);
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int cdif = iabs(column - history[movecount - 1].x);
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if (!((rdif == 1) && (cdif == 2)) && !((rdif == 2) && (cdif == 1))) {
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waddstr(msgwin, "\nThat's not a legal knight's move.");
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return (FALSE);
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}
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}
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return (TRUE);
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}
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static int
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completed(void)
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{
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int i, j, count = 0;
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for (i = 0; i < BDEPTH; i++)
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for (j = 0; j < BWIDTH; j++)
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if (board[i][j] != 0)
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count += 1;
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return (count == (BWIDTH * BDEPTH) ? -1 : count);
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}
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static void
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no_previous_move(void)
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{
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waddstr(msgwin, "\nNo previous move.");
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beep();
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}
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static void
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play(void)
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/* play the game */
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{
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bool keyhelp; /* TRUE if keystroke help is up */
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int i, j, count;
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int lastcol = 0; /* last location visited */
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int lastrow = 0;
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int ny = 0, nx = 0;
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int review = 0; /* review history */
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int rw = 0, col = 0; /* current row and column */
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do {
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/* clear screen and draw board */
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werase(boardwin);
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werase(helpwin);
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werase(msgwin);
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dosquares();
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help1();
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wnoutrefresh(stdscr);
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wnoutrefresh(helpwin);
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wnoutrefresh(msgwin);
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wnoutrefresh(boardwin);
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doupdate();
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movecount = 0;
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for (i = 0; i < BDEPTH; i++) {
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for (j = 0; j < BWIDTH; j++) {
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board[i][j] = FALSE;
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unmarkcell(i, j);
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}
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}
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memset(history, 0, sizeof(history));
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history[0].y = history[0].x = -1;
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history[1].y = history[1].x = -1;
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lastrow = lastcol = -2;
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movecount = 1;
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trialcount = 1;
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keyhelp = FALSE;
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show_help(&keyhelp);
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for (;;) {
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if (rw != lastrow || col != lastcol) {
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if (lastrow >= 0 && lastcol >= 0) {
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cellmove(lastrow, lastcol);
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if (board[lastrow][lastcol])
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waddch(boardwin, trail);
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else
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waddch(boardwin, oldch);
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}
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cellmove(rw, col);
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oldch = winch(boardwin);
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lastrow = rw;
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lastcol = col;
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}
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cellmove(rw, col);
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waddch(boardwin, plus);
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cellmove(rw, col);
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wrefresh(msgwin);
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switch (wgetch(boardwin)) {
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case 'k':
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case '8':
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case KEY_UP:
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ny = rw + BDEPTH - 1;
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nx = col;
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break;
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case 'j':
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case '2':
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case KEY_DOWN:
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ny = rw + 1;
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nx = col;
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break;
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case 'h':
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case '4':
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case KEY_LEFT:
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ny = rw;
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nx = col + BWIDTH - 1;
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break;
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case 'l':
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case '6':
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case KEY_RIGHT:
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ny = rw;
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nx = col + 1;
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break;
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case 'y':
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case '7':
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case KEY_A1:
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ny = rw + BDEPTH - 1;
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nx = col + BWIDTH - 1;
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break;
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case 'b':
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case '1':
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case KEY_C1:
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ny = rw + 1;
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nx = col + BWIDTH - 1;
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break;
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case 'u':
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case '9':
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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 NCURSES_MOUSE_VERSION
|
|
case KEY_MOUSE:
|
|
{
|
|
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 */
|
|
|
|
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 = rw;
|
|
history[movecount].x = 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;
|
|
nx = lastcol;
|
|
}
|
|
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;
|
|
find_next_move(&ny, &nx);
|
|
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();
|
|
return EXIT_SUCCESS;
|
|
}
|
|
|
|
/* knight.c ends here */
|