minix/commands/simple/gomoku.c

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2005-04-21 16:53:53 +02:00
/* gomoku - 5 in a row game Author: ? */
/* This program plays a very old Japanese game called GO-MOKU,
perhaps better known as 5-in-line. The game is played on
a board with 19 x 19 squares, and the object of the game is
to get 5 stones in a row.
*/
#include <sys/types.h>
#include <curses.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
/* Size of the board */
#define SIZE 19
/* Importance of attack (1..16) */
#define AttackFactor 4
/* Value of having 0, 1,2,3,4 or 5 pieces in line */
int Weight[7] = {0, 0, 4, 20, 100, 500, 0};
#define Null 0
#define Horiz 1
#define DownLeft 2
#define DownRight 3
#define Vert 4
/* The two players */
#define Empty 0
#define Cross 1
#define Nought 2
char PieceChar[Nought + 1] = {' ', 'X', '0'};
int Board[SIZE + 1][SIZE + 1];/* The board */
int Player; /* The player whose move is next */
int TotalLines; /* The number of Empty lines left */
int GameWon; /* Set if one of the players has won */
int Line[4][SIZE + 1][SIZE + 1][Nought + 1];
/* Value of each square for each player */
int Value[SIZE + 1][SIZE + 1][Nought + 1];
int X, Y; /* Move coordinates */
char Command; /* Command from keyboard */
int AutoPlay = FALSE; /* The program plays against itself */
_PROTOTYPE(void Initialize, (void));
_PROTOTYPE(int Abort, (char *s));
_PROTOTYPE(void WriteLetters, (void));
_PROTOTYPE(void WriteLine, (int j, int *s));
_PROTOTYPE(void WriteBoard, (int N, int *Top, int *Middle, int *Bottom));
_PROTOTYPE(void SetUpScreen, (void));
_PROTOTYPE(void GotoSquare, (int x, int y));
_PROTOTYPE(void PrintMove, (int Piece, int X, int Y));
_PROTOTYPE(void ClearMove, (void));
_PROTOTYPE(void PrintMsg, (char *Str));
_PROTOTYPE(void ClearMsg, (void));
_PROTOTYPE(void WriteCommand, (char *S));
_PROTOTYPE(void ResetGame, (int FirstGame));
_PROTOTYPE(int OpponentColor, (int Player));
_PROTOTYPE(void BlinkRow, (int X, int Y, int Dx, int Dy, int Piece));
_PROTOTYPE(void BlinkWinner, (int Piece, int X, int Y, int WinningLine));
_PROTOTYPE(int Random, (int x));
_PROTOTYPE(void Add, (int *Num));
_PROTOTYPE(void Update, (int Lin[], int Valu[], int Opponent));
_PROTOTYPE(void MakeMove, (int X, int Y));
_PROTOTYPE(int GameOver, (void));
_PROTOTYPE(void FindMove, (int *X, int *Y));
_PROTOTYPE(char GetChar, (void));
_PROTOTYPE(void ReadCommand, (int X, int Y, char *Command));
_PROTOTYPE(void InterpretCommand, (int Command));
_PROTOTYPE(void PlayerMove, (void));
_PROTOTYPE(void ProgramMove, (void));
_PROTOTYPE(int main, (void));
/* Set terminal to raw mode. */
void Initialize()
{
srand(getpid() + 13); /* Initialize the random seed with our pid */
initscr();
raw();
noecho();
clear();
}
/* Reset terminal and exit from the program. */
int Abort(s)
char *s;
{
move(LINES - 1, 0);
refresh();
endwin();
exit(0);
}
/* Set up the screen ----------------------------------------------- */
/* Write the letters */
void WriteLetters()
{
int i;
addch(' ');
addch(' ');
for (i = 1; i <= SIZE; i++) printw(" %c", 'A' + i - 1);
addch('\n');
}
/* Write one line of the board */
void WriteLine(j, s)
int j;
int *s;
{
int i;
printw("%2d ", j);
addch(s[0]);
for (i = 2; i <= SIZE - 1; i++) {
addch(s[1]);
addch(s[2]);
}
addch(s[1]);
addch(s[3]);
printw(" %-2d\n", j);
}
/* Print the Empty board and the border */
void WriteBoard(N, Top, Middle, Bottom)
int N;
int *Top, *Middle, *Bottom;
{
int j;
move(1, 0);
WriteLetters();
WriteLine(N, Top);
for (j = N - 1; j >= 2; j--) WriteLine(j, Middle);
WriteLine(1, Bottom);
WriteLetters();
}
/* Sets up the screen with an Empty board */
void SetUpScreen()
{
int top[4], middle[4], bottom[4];
top[0] = ACS_ULCORNER;
top[1] = ACS_HLINE;
top[2] = ACS_TTEE;
top[3] = ACS_URCORNER;
middle[0] = ACS_LTEE;
middle[1] = ACS_HLINE;
middle[2] = ACS_PLUS;
middle[3] = ACS_RTEE;
bottom[0] = ACS_LLCORNER;
bottom[1] = ACS_HLINE;
bottom[2] = ACS_BTEE;
bottom[3] = ACS_LRCORNER;
WriteBoard(SIZE, top, middle, bottom);
}
/* Show moves ----------------------------------------------- */
void GotoSquare(x, y)
int x, y;
{
move(SIZE + 2 - y, 1 + x * 2);
}
/* Prints a move */
void PrintMove(Piece, X, Y)
int Piece;
int X, Y;
{
move(22, 49);
printw("%c %c %d", PieceChar[Piece], 'A' + X - 1, Y);
clrtoeol();
GotoSquare(X, Y);
addch(PieceChar[Piece]);
GotoSquare(X, Y);
refresh();
}
/* Clears the line where a move is displayed */
void ClearMove()
{
move(22, 49);
clrtoeol();
}
/* Message handling ---------------------------------------------- */
/* Prints a message */
void PrintMsg(Str)
char *Str;
{
mvprintw(23, 1, "%s", Str);
}
/* Clears the message about the winner */
void ClearMsg()
{
move(23, 1);
clrtoeol();
}
/* Highlights the first letter of S */
void WriteCommand(S)
char *S;
{
standout();
addch(*S);
standend();
printw("%s", S + 1);
}
/* Display the board ----------------------------------------------- */
/* Resets global variables to start a new game */
void ResetGame(FirstGame)
int FirstGame;
{
int I, J;
int C, D;
SetUpScreen();
if (FirstGame) {
move(1, 49);
addstr("G O M O K U");
move(3, 49);
WriteCommand("Newgame ");
WriteCommand("Quit ");
move(5, 49);
WriteCommand("Auto");
move(7, 49);
WriteCommand("Play");
move(9, 49);
WriteCommand("Hint");
move(14, 60);
WriteCommand("Left, ");
WriteCommand("Right, ");
move(16, 60);
WriteCommand("Up, ");
WriteCommand("Down");
move(18, 60);
standout();
addstr("SPACE");
move(20, 49);
WriteCommand(" NOTE: Use Num Lock & arrows");
standend();
mvaddstr(14, 49, "7 8 9");
mvaddch(15, 52, ACS_UARROW);
mvaddch(16, 49, '4');
addch(ACS_LARROW);
mvaddch(16, 54, ACS_RARROW);
addch('6');
mvaddch(17, 52, ACS_DARROW);
mvaddstr(18, 49, "1 2 3");
FirstGame = FALSE;
} else {
ClearMsg();
ClearMove();
}
/* Clear tables */
for (I = 1; I <= SIZE; I++) for (J = 1; J <= SIZE; J++) {
Board[I][J] = Empty;
for (C = Cross; C <= Nought; C++) {
Value[I][J][C] = 0;
for (D = 0; D <= 3; D++) Line[D][I][J][C] = 0;
}
}
/* Cross starts */
Player = Cross;
/* Total number of lines */
TotalLines = 2 * 2 * (SIZE * (SIZE - 4) + (SIZE - 4) * (SIZE - 4));
GameWon = FALSE;
}
int OpponentColor(Player)
int Player;
{
if (Player == Cross)
return Nought;
else
return Cross;
}
/* Blink the row of 5 stones */
void BlinkRow(X, Y, Dx, Dy, Piece)
int X, Y, Dx, Dy, Piece;
{
int I;
attron(A_BLINK);
for (I = 1; I <= 5; I++) {
GotoSquare(X, Y);
addch(PieceChar[Piece]);
X = X - Dx;
Y = Y - Dy;
}
attroff(A_BLINK);
}
/* Prints the 5 winning stones in blinking color */
void BlinkWinner(Piece, X, Y, WinningLine)
int Piece, X, Y, WinningLine;
{
/* Used to store the position of the winning move */
int XHold, YHold;
/* Change in X and Y */
int Dx, Dy;
/* Display winning move */
PrintMove(Piece, X, Y);
/* Preserve winning position */
XHold = X;
YHold = Y;
switch (WinningLine) {
case Horiz:
{
Dx = 1;
Dy = 0;
break;
}
case DownLeft:
{
Dx = 1;
Dy = 1;
break;
}
case Vert:
{
Dx = 0;
Dy = 1;
break;
}
case DownRight:
{
Dx = -1;
Dy = 1;
break;
}
}
/* Go to topmost, leftmost */
while (Board[X + Dx][Y + Dy] != Empty && Board[X + Dx][Y + Dy] == Piece) {
X = X + Dx;
Y = Y + Dy;
}
BlinkRow(X, Y, Dx, Dy, Piece);
/* Restore winning position */
X = XHold;
Y = YHold;
/* Go back to winning square */
GotoSquare(X, Y);
}
/* Functions for playing a game -------------------------------- */
int Random(x)
int x;
{
return((rand() / 19) % x);
}
/* Adds one to the number of pieces in a line */
void Add(Num)
int *Num;
{
/* Adds one to the number. */
*Num = *Num + 1;
/* If it is the first piece in the line, then the opponent cannot use
* it any more. */
if (*Num == 1) TotalLines = TotalLines - 1;
/* The game is won if there are 5 in line. */
if (*Num == 5) GameWon = TRUE;
}
/* Updates the value of a square for each player, taking into
account that player has placed an extra piece in the square.
The value of a square in a usable line is Weight[Lin[Player]+1]
where Lin[Player] is the number of pieces already placed
in the line */
void Update(Lin, Valu, Opponent)
int Lin[];
int Valu[];
int Opponent;
{
/* If the opponent has no pieces in the line, then simply update the
* value for player */
if (Lin[Opponent] == 0)
Valu[Player] += Weight[Lin[Player] + 1] - Weight[Lin[Player]];
else
/* If it is the first piece in the line, then the line is
* spoiled for the opponent */
if (Lin[Player] == 1) Valu[Opponent] -= Weight[Lin[Opponent] + 1];
}
/* Performs the move X,Y for player, and updates the global variables
(Board, Line, Value, Player, GameWon, TotalLines and the screen) */
void MakeMove(X, Y)
int X, Y;
{
int Opponent;
int X1, Y1;
int K, L, WinningLine;
WinningLine = Null;
Opponent = OpponentColor(Player);
GameWon = FALSE;
/* Each square of the board is part of 20 different lines. The adds
* one to the number of pieces in each of these lines. Then it
* updates the value for each of the 5 squares in each of the 20
* lines. Finally Board is updated, and the move is printed on the
* screen. */
/* Horizontal lines, from left to right */
for (K = 0; K <= 4; K++) {
X1 = X - K; /* Calculate starting point */
Y1 = Y;
if ((1 <= X1) && (X1 <= SIZE - 4)) { /* Check starting point */
Add(&Line[0][X1][Y1][Player]); /* Add one to line */
if (GameWon && (WinningLine == Null)) /* Save winning line */
WinningLine = Horiz;
for (L = 0; L <= 4; L++) /* Update value for the
* 5 squares in the line */
Update(Line[0][X1][Y1], Value[X1 + L][Y1], Opponent);
}
}
for (K = 0; K <= 4; K++) { /* Diagonal lines, from lower left to
* upper right */
X1 = X - K;
Y1 = Y - K;
if ((1 <= X1) && (X1 <= SIZE - 4) &&
(1 <= Y1) && (Y1 <= SIZE - 4)) {
Add(&Line[1][X1][Y1][Player]);
if (GameWon && (WinningLine == Null)) /* Save winning line */
WinningLine = DownLeft;
for (L = 0; L <= 4; L++)
Update(Line[1][X1][Y1], Value[X1 + L][Y1 + L], Opponent);
}
} /* for */
for (K = 0; K <= 4; K++) { /* Diagonal lines, down right to upper left */
X1 = X + K;
Y1 = Y - K;
if ((5 <= X1) && (X1 <= SIZE) &&
(1 <= Y1) && (Y1 <= SIZE - 4)) {
Add(&Line[3][X1][Y1][Player]);
if (GameWon && (WinningLine == Null)) /* Save winning line */
WinningLine = DownRight;
for (L = 0; L <= 4; L++)
Update(Line[3][X1][Y1], Value[X1 - L][Y1 + L], Opponent);
}
} /* for */
for (K = 0; K <= 4; K++) { /* Vertical lines, from down to up */
X1 = X;
Y1 = Y - K;
if ((1 <= Y1) && (Y1 <= SIZE - 4)) {
Add(&Line[2][X1][Y1][Player]);
if (GameWon && (WinningLine == Null)) /* Save winning line */
WinningLine = Vert;
for (L = 0; L <= 4; L++)
Update(Line[2][X1][Y1], Value[X1][Y1 + L], Opponent);
}
}
Board[X][Y] = Player; /* Place piece in board */
if (GameWon)
BlinkWinner(Player, X, Y, WinningLine);
else
PrintMove(Player, X, Y);/* Print move on screen */
Player = Opponent; /* The opponent is next to move */
}
int GameOver()
/* A game is over if one of the players have
won, or if there are no more Empty lines */
{
return(GameWon || (TotalLines <= 0));
}
/* Finds a move X,Y for player, simply by picking the one with the
highest value */
void FindMove(X, Y)
int *X, *Y;
{
int Opponent;
int I, J;
int Max, Valu;
Opponent = OpponentColor(Player);
Max = -10000;
/* If no square has a high value then pick the one in the middle */
*X = (SIZE + 1) / 2;
*Y = (SIZE + 1) / 2;
if (Board[*X][*Y] == Empty) Max = 4;
/* The evaluation for a square is simply the value of the square for
* the player (attack points) plus the value for the opponent
* (defense points). Attack is more important than defense, since it
* is better to get 5 in line yourself than to prevent the op- ponent
* from getting it. */
/* For all Empty squares */
for (I = 1; I <= SIZE; I++) for (J = 1; J <= SIZE; J++)
if (Board[I][J] == Empty) {
/* Calculate evaluation */
Valu = Value[I][J][Player] * (16 + AttackFactor) / 16 + Value[I][J][Opponent] + Random(4);
/* Pick move with highest value */
if (Valu > Max) {
*X = I;
*Y = J;
Max = Valu;
}
}
}
char GetChar()
/* Get a character from the keyboard */
{
int c;
c = getch();
if (c < 0) abort();
if (c == '\033') { /* arrow key */
if ((c = getch()) == '[') {
c = getch();
switch (c) {
case 'A': c = 'U'; break;
case 'B': c = 'D'; break;
case 'C': c = 'R'; break;
case 'D': c = 'L'; break;
default:
c = '?';
break;
}
}
else
c = '?';
}
if (islower(c))
return toupper(c);
else
return c;
}
/* Reads in a valid command character */
void ReadCommand(X, Y, Command)
int X, Y;
char *Command;
{
int ValidCommand;
do {
ValidCommand = TRUE;
GotoSquare(X, Y); /* Goto square */
refresh();
*Command = GetChar(); /* Read from keyboard */
switch (*Command) {
case '\n': /* '\n', '\r' or space means place a */
case '\r':
case ' ':
*Command = 'E';
break; /* stone at the cursor position */
case 'L':
case 'R':
case 'U':
case 'D':
case '7':
case '9':
case '1':
case '3':
case 'N':
case 'Q':
case 'A':
case 'P':
case 'H':
break;
case '8': *Command = 'U'; break;
case '2': *Command = 'D'; break;
case '4': *Command = 'L'; break;
case '6': *Command = 'R'; break;
default:
{
if (GameOver())
*Command = 'P';
else
ValidCommand = FALSE;
break;
}
}
} while (!ValidCommand);
}
void InterpretCommand(Command)
char Command;
{
int Temp;
switch (Command) {
case 'N':{ /* Start new game */
ResetGame(FALSE); /* ResetGame but only redraw
* the board */
X = (SIZE + 1) / 2;
Y = X;
break;
}
case 'H':
FindMove(&X, &Y);
break; /* Give the user a hint */
case 'L':
X = (X + SIZE - 2) % SIZE + 1;
break; /* Left */
case 'R':
X = X % SIZE + 1;
break; /* Right */
case 'D':
Y = (Y + SIZE - 2) % SIZE + 1;
break; /* Down */
case 'U':
Y = Y % SIZE + 1;
break; /* Up */
case '7':{
if ((X == 1) || (Y == SIZE)) { /* Move diagonally *//* t
* owards upper left */
Temp = X;
X = Y;
Y = Temp;
} else {
X = X - 1;
Y = Y + 1;
}
break;
}
case '9':{ /* Move diagonally */
if (X == SIZE) {/* toward upper right */
X = (SIZE - Y) + 1;
Y = 1;
} else if (Y == SIZE) {
Y = (SIZE - X) + 1;
X = 1;
} else {
X = X + 1;
Y = Y + 1;
}
break;
}
case '1':{ /* Move diagonally */
if (Y == 1) { /* toward lower left */
Y = (SIZE - X) + 1;
X = SIZE;
} else if (X == 1) {
X = (SIZE - Y) + 1;
Y = SIZE;
} else {
X = X - 1;
Y = Y - 1;
}
break;
}
case '3':{ /* Move diagonally */
if ((X == SIZE) || (Y == 1)) { /* toward lower right */
Temp = X;
X = Y;
Y = Temp;
} else {
X = X + 1;
Y = Y - 1;
}
break;
}
case 'A':
AutoPlay = TRUE;
break; /* Auto play mode */
} /* case */
} /* InterpretCommand */
void PlayerMove()
/* Enter and make a move */
{
if (Board[X][Y] == Empty) {
MakeMove(X, Y);
if (GameWon) PrintMsg("Congratulations, You won!");
Command = 'P';
}
refresh();
} /* PlayerMove */
void ProgramMove()
/* Find and perform programs move */
{
do {
if (GameOver()) {
AutoPlay = FALSE;
if ((Command != 'Q') && (!GameWon)) PrintMsg("Tie game!");
} else {
FindMove(&X, &Y);
MakeMove(X, Y);
if (GameWon) PrintMsg("I won!");
}
refresh();
} while (AutoPlay);
}
int main()
{
Initialize();
ResetGame(TRUE); /* ResetGame and draw the entire screen */
refresh();
X = (SIZE + 1) / 2; /* Set starting position to */
Y = X; /* the middle of the board */
do {
ReadCommand(X, Y, &Command);
if (GameOver())
if (Command != 'Q') Command = 'N';
InterpretCommand(Command);
if (Command == 'E') PlayerMove();
if (Command == 'P' || Command == 'A') ProgramMove();
} while (Command != 'Q');
Abort("Good bye!");
return(0);
}