#include <QtGui>#include "tictactoe.h"TicTacToe::TicTacToe(QWidget *parent)    : QWidget(parent){    clearBoard();    if (qApp->isSessionRestored())        restoreState();    setWindowTitle(tr("Tic-Tac-Toe"));}QSize TicTacToe::sizeHint() const{    return QSize(200, 200);}void TicTacToe::clearBoard(){    for (int row = 0; row < 3; ++row) {        for (int column = 0; column < 3; ++column) {            board[row][column] = Empty;        }    }    turnNumber = 0;}void TicTacToe::restoreState(){    QFile file(sessionFileName());    if (file.open(QIODevice::ReadOnly)) {        QTextStream in(&file);        for (int row = 0; row < 3; ++row) {            for (int column = 0; column < 3; ++column) {                in >> board[row][column];                if (board[row][column] != Empty)                    ++turnNumber;            }        }    }    update();}QString TicTacToe::sessionFileName() const{    return QDir::homePath() + "/.tictactoe_" + qApp->sessionId() + "_"           + qApp->sessionKey();}QString TicTacToe::saveState() const{    QFile file(sessionFileName());    if (file.open(QIODevice::WriteOnly)) {        QTextStream out(&file);        for (int row = 0; row < 3; ++row) {            for (int column = 0; column < 3; ++column)                out << board[row][column];        }    }    return file.fileName();}bool TicTacToe::gameInProgress() const{    return turnNumber > 0 && turnNumber < 9;}void TicTacToe::paintEvent(QPaintEvent * /* event */){    QPainter painter(this);    painter.setRenderHint(QPainter::Antialiasing, true);    painter.setPen(QPen(Qt::red, 1));    painter.drawLine(cellWidth(), 0, cellWidth(), height());    painter.drawLine(2 * cellWidth(), 0, 2 * cellWidth(), height());    painter.drawLine(0, cellHeight(), width(), cellHeight());    painter.drawLine(0, 2 * cellHeight(), width(), 2 * cellHeight());    painter.setPen(QPen(Qt::blue, 2));    for (int row = 0; row < 3; ++row) {        for (int column = 0; column < 3; ++column) {            QRect r = cellRect(row, column);            if (board[row][column] == Cross) {                painter.drawLine(r.topLeft(), r.bottomRight());                painter.drawLine(r.topRight(), r.bottomLeft());            } else if (board[row][column] == Nought) {                painter.drawEllipse(r);            }        }    }    painter.setPen(QPen(Qt::green, 3));    for (int row = 0; row < 3; ++row) {        if (threeInARow(row, 0, row, 2)) {            int y = cellRect(row, 0).center().y();            painter.drawLine(0, y, width(), y);            turnNumber = 9;        }    }    for (int column = 0; column < 3; ++column) {        if (threeInARow(0, column, 2, column)) {            int x = cellRect(0, column).center().x();            painter.drawLine(x, 0, x, height());            turnNumber = 9;        }    }    if (threeInARow(0, 0, 2, 2)) {        painter.drawLine(0, 0, width(), height());        turnNumber = 9;    }    if (threeInARow(0, 2, 2, 0)) {        painter.drawLine(0, height(), width(), 0);        turnNumber = 9;    }}void TicTacToe::mousePressEvent(QMouseEvent *event){    if (turnNumber == 9) {        clearBoard();        update();    } else {        for (int row = 0; row < 3; ++row) {            for (int column = 0; column < 3; ++column) {                QRect r = cellRect(row, column);                if (r.contains(event->pos())) {                    if (board[row][column] == Empty) {                        if (turnNumber % 2 == 0) {                            board[row][column] = Cross;                        } else {                            board[row][column] = Nought;                        }                        ++turnNumber;                        update();                    }                    break;                }            }        }    }}QRect TicTacToe::cellRect(int row, int column) const{    const int HMargin = width() / 30;    const int VMargin = height() / 30;    return QRect(column * cellWidth() + HMargin,                 row * cellHeight() + VMargin,                 cellWidth() - 2 * HMargin,                 cellHeight() - 2 * VMargin);}bool TicTacToe::threeInARow(int row1, int column1, int row3,                            int column3) const{    int row2 = (row1 + row3) / 2;    int column2 = (column1 + column3) / 2;    return board[row1][column1] != Empty           && board[row2][column2] == board[row1][column1]           && board[row3][column3] == board[row1][column1];}