/****************************************************************************
 **
 ** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the example classes of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
 ** http://trolltech.com/products/qt/licenses/licensing/opensource/
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
 ** or contact the sales department at sales@trolltech.com.
 **
 ** In addition, as a special exception, Trolltech gives you certain
 ** additional rights. These rights are described in the Trolltech GPL
 ** Exception version 1.0, which can be found at
 ** http://www.trolltech.com/products/qt/gplexception/ and in the file
 ** GPL_EXCEPTION.txt in this package.
 **
 ** In addition, as a special exception, Trolltech, as the sole copyright
 ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
 ** plug-in the right for the Qt/Eclipse Integration to link to
 ** functionality provided by Qt Designer and its related libraries.
 **
 ** Trolltech reserves all rights not expressly granted herein.
 **
 ** Trolltech ASA (c) 2007
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/
 
 #include <QtGui>
 
 #include "tictactoe.h"
 
 TicTacToe::TicTacToe(QWidget *parent)
     : QWidget(parent)
 {
 }
 
 QSize TicTacToe::minimumSizeHint() const
 {
     return QSize(200, 200);
 }
 
 QSize TicTacToe::sizeHint() const
 {
     return QSize(200, 200);
 }
 
 void TicTacToe::setState(const QString &newState)
 {
     turnNumber = 0;
     myState = "---------";
     int position = 0;
     while (position < 9 && position < newState.length()) {
         QChar mark = newState.at(position);
         if (mark == Cross || mark == Nought) {
             ++turnNumber;
             myState.replace(position, 1, mark);
         }
         position++;
     }
     update();
 }
 
 QString TicTacToe::state() const
 {
     return myState;
 }
 
 void TicTacToe::clearBoard()
 {
     myState = "---------";
     turnNumber = 0;
     update();
 }
 
 void TicTacToe::mousePressEvent(QMouseEvent *event)
 {
     if (turnNumber == 9) {
         clearBoard();
         update();
     } else {
         for (int position = 0; position < 9; ++position) {
             QRect cell = cellRect(position / 3, position % 3);
             if (cell.contains(event->pos())) {
                 if (myState.at(position) == Empty) {
                     if (turnNumber % 2 == 0)
                         myState.replace(position, 1, Cross);
                     else
                         myState.replace(position, 1, Nought);
                     ++turnNumber;
                     update();
                 }
             }
         }
     }
 }
 
 void TicTacToe::paintEvent(QPaintEvent * /* event */)
 {
     QPainter painter(this);
     painter.setRenderHint(QPainter::Antialiasing);
 
     painter.setPen(QPen(Qt::darkGreen, 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::darkBlue, 2));
 
     for (int position = 0; position < 9; ++position) {
         QRect cell = cellRect(position / 3, position % 3);
 
         if (myState.at(position) == Cross) {
             painter.drawLine(cell.topLeft(), cell.bottomRight());
             painter.drawLine(cell.topRight(), cell.bottomLeft());
         } else if (myState.at(position) == Nought) {
             painter.drawEllipse(cell);
         }
     }
 
     painter.setPen(QPen(Qt::yellow, 3));
 
     for (int position = 0; position < 9; position = position + 3) {
         if (myState.at(position) != Empty
                 && myState.at(position + 1) == myState.at(position)
                 && myState.at(position + 2) == myState.at(position)) {
             int y = cellRect((position / 3), 0).center().y();
             painter.drawLine(0, y, width(), y);
             turnNumber = 9;
         }
     }
 
     for (int position = 0; position < 3; ++position) {
         if (myState.at(position) != Empty
                 && myState.at(position + 3) == myState.at(position)
                 && myState.at(position + 6) == myState.at(position)) {
             int x = cellRect(0, position).center().x();
             painter.drawLine(x, 0, x, height());
             turnNumber = 9;
         }
     }
     if (myState.at(0) != Empty && myState.at(4) == myState.at(0)
             && myState.at(8) == myState.at(0)) {
         painter.drawLine(0, 0, width(), height());
         turnNumber = 9;
     }
     if (myState.at(2) != Empty && myState.at(4) == myState.at(2)
             && myState.at(6) == myState.at(2)) {
         painter.drawLine(0, height(), width(), 0);
         turnNumber = 9;
     }
 }
 
 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);
 }