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-rw-r--r--contrib/ncurses/test/knight.c565
1 files changed, 565 insertions, 0 deletions
diff --git a/contrib/ncurses/test/knight.c b/contrib/ncurses/test/knight.c
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+++ b/contrib/ncurses/test/knight.c
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+/*
+ * 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 1.14 1997/08/20 16:22:38 hjl Exp $
+ */
+
+#include <test.priv.h>
+
+#include <ctype.h>
+#include <signal.h>
+#include <string.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 short board[BDEPTH][BWIDTH]; /* the squares */
+static int rw,col; /* current row and column */
+static int lastrow,lastcol; /* last location visited */
+static cell history[BDEPTH*BWIDTH]; /* choice history */
+static int movecount; /* count of moves so far */
+static WINDOW *boardwin; /* the board window */
+static WINDOW *helpwin; /* the help window */
+static WINDOW *msgwin; /* the message window */
+static chtype trail = '#'; /* trail character */
+static chtype plus = '+'; /* cursor hot-spot character */
+static chtype minus = '-'; /* possible-move character */
+static chtype oldch;
+
+static void init(void);
+static void play(void);
+static void dosquares(void);
+static void drawmove(char, int, int, int, int);
+static bool evalmove(int, int);
+static bool chkmoves(void);
+static bool chksqr(int, int);
+static int iabs(int);
+
+int main(
+ int argc GCC_UNUSED,
+ char *argv[] GCC_UNUSED)
+{
+ init();
+
+ play();
+
+ endwin();
+ return EXIT_SUCCESS;
+}
+
+static void init (void)
+{
+ 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();
+#ifdef NCURSES_VERSION
+ if (use_default_colors() == OK)
+ bg = -1;
+#endif
+
+ (void) init_pair(TRAIL_COLOR, COLOR_CYAN, bg);
+ (void) init_pair(PLUS_COLOR, COLOR_RED, bg);
+ (void) init_pair(MINUS_COLOR, COLOR_GREEN, bg);
+
+ trail |= COLOR_PAIR(TRAIL_COLOR);
+ plus |= COLOR_PAIR(PLUS_COLOR);
+ minus |= COLOR_PAIR(MINUS_COLOR);
+ }
+
+#ifdef NCURSES_MOUSE_VERSION
+ (void) mousemask(BUTTON1_CLICKED, (mmask_t *)NULL);
+#endif /* NCURSES_MOUSE_VERSION*/
+
+ 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");
+
+ (void)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, "u -- undo move h-+-l 4-+-6\n");
+ (void)waddstr(helpwin, " /|\\ /|\\ \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. You can quit with `x' or `q'.\n");
+
+ (void)mvwaddstr(helpwin, NOTIFYY-INSTRY, 0,
+ "Press `?' to go to game explanation");
+}
+
+static void play (void)
+/* play the game */
+{
+ bool keyhelp; /* TRUE if keystroke help is up */
+ int c, ny = 0, nx = 0;
+ int i, j, count;
+
+ do {
+ /* clear screen and draw board */
+ werase(boardwin);
+ werase(helpwin);
+ werase(msgwin);
+ dosquares();
+ help1();
+ wnoutrefresh(stdscr);
+ wnoutrefresh(helpwin);
+ wnoutrefresh(msgwin);
+ wnoutrefresh(boardwin);
+ doupdate();
+
+ for (i = 0; i < BDEPTH; i++)
+ for (j = 0; j < BWIDTH; j++)
+ {
+ board[i][j] = FALSE;
+ cellmove(i, j);
+ waddch(boardwin, minus);
+ }
+ memset(history, '\0', sizeof(history));
+ history[0].y = history[0].x = -1;
+ lastrow = lastcol = -2;
+ movecount = 1;
+ keyhelp = FALSE;
+
+ 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);
+
+ c = wgetch(boardwin);
+
+ werase(msgwin);
+
+ switch (c)
+ {
+ 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 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 ' ':
+ 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++;
+
+ if (!chkmoves())
+ goto dropout;
+ }
+ else
+ beep();
+ break;
+
+ case KEY_REDO:
+ case '\f':
+ case 'r':
+ clearok(curscr, TRUE);
+ wnoutrefresh(stdscr);
+ wnoutrefresh(boardwin);
+ wnoutrefresh(msgwin);
+ wnoutrefresh(helpwin);
+ doupdate();
+ break;
+
+ case KEY_UNDO:
+ case KEY_BACKSPACE:
+ case '\b':
+ if (movecount == 1)
+ {
+ ny = lastrow;
+ nx = lastcol;
+ waddstr(msgwin, "\nNo previous move.");
+ beep();
+ }
+ else
+ {
+ int oldy = history[movecount-1].y;
+ int oldx = history[movecount-1].x;
+
+ board[oldy][oldx] = FALSE;
+ --movecount;
+ ny = history[movecount-1].y;
+ nx = history[movecount-1].x;
+ drawmove(' ', oldy, oldx, ny, nx);
+
+ /* avoid problems if we just changed the current cell */
+ cellmove(lastrow, lastcol);
+ oldch = winch(boardwin);
+ }
+ break;
+
+ case 'q':
+ case 'x':
+ goto dropout;
+
+ case '?':
+ werase(helpwin);
+ if (keyhelp)
+ {
+ help1();
+ keyhelp = FALSE;
+ }
+ else
+ {
+ help2();
+ keyhelp = TRUE;
+ }
+ wrefresh(helpwin);
+ break;
+
+ default:
+ beep();
+ break;
+ }
+
+ col = nx % BWIDTH;
+ rw = ny % BDEPTH;
+ }
+
+ dropout:
+ count = 0;
+ for (i = 0; i < BDEPTH; i++)
+ for (j = 0; j < BWIDTH; j++)
+ if (board[i][j] != 0)
+ count += 1;
+ if (count == (BWIDTH * BDEPTH))
+ wprintw(msgwin, "\nYou won. Care to try again? ");
+ else
+ wprintw(msgwin, "\n%d squares filled. Try again? ", count);
+ } while
+ (tolower(wgetch(msgwin)) == 'y');
+}
+
+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)
+{
+ if (chksqr(prow+2,pcol+1)){cellmove(prow+2,pcol+1);waddch(boardwin,mark);};
+ if (chksqr(prow+2,pcol-1)){cellmove(prow+2,pcol-1);waddch(boardwin,mark);};
+ if (chksqr(prow-2,pcol+1)){cellmove(prow-2,pcol+1);waddch(boardwin,mark);};
+ if (chksqr(prow-2,pcol-1)){cellmove(prow-2,pcol-1);waddch(boardwin,mark);};
+ if (chksqr(prow+1,pcol+2)){cellmove(prow+1,pcol+2);waddch(boardwin,mark);};
+ if (chksqr(prow+1,pcol-2)){cellmove(prow+1,pcol-2);waddch(boardwin,mark);};
+ if (chksqr(prow-1,pcol+2)){cellmove(prow-1,pcol+2);waddch(boardwin,mark);};
+ if (chksqr(prow-1,pcol-2)){cellmove(prow-1,pcol-2);waddch(boardwin,mark);};
+}
+
+static void drawmove(char 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++)
+ {
+ cellmove(i, j);
+ if (winch(boardwin) == minus)
+ waddch(boardwin, movecount ? ' ' : minus);
+ }
+ }
+ else
+ {
+ cellmove(oldy, oldx);
+ waddch(boardwin, '\b');
+ waddch(boardwin, tchar);
+ waddch(boardwin, tchar);
+ waddch(boardwin, tchar);
+ mark_possibles(oldy, oldx, ' ');
+ }
+
+ if (row != -1 && column != -1)
+ {
+ cellmove(row, column);
+ waddch(boardwin, '\b');
+ waddch(boardwin, trail);
+ waddch(boardwin, trail);
+ waddch(boardwin, trail);
+ mark_possibles(row, column, minus);
+ board[row][column] = TRUE;
+ }
+
+ wprintw(msgwin, "\nMove %d", movecount);
+}
+
+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 bool chkmoves (void)
+/* check to see if valid moves are available */
+{
+ if (chksqr(rw+2,col+1)) return(TRUE);
+ if (chksqr(rw+2,col-1)) return(TRUE);
+ if (chksqr(rw-2,col+1)) return(TRUE);
+ if (chksqr(rw-2,col-1)) return(TRUE);
+ if (chksqr(rw+1,col+2)) return(TRUE);
+ if (chksqr(rw+1,col-2)) return(TRUE);
+ if (chksqr(rw-1,col+2)) return(TRUE);
+ if (chksqr(rw-1,col-2)) return(TRUE);
+ return (FALSE);
+}
+
+static int iabs(int num)
+{
+ if (num < 0) return (-num);
+ else return (num);
+}
+
+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);
+}
+
+/* knight.c ends here */
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