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<title>Qt 4.2: tictactoe.cpp Example File (designer/taskmenuextension/tictactoe.cpp)</title>
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<pre> /****************************************************************************
**
** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
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#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;
for (int position = 0; position < 9; ++position) {
if (newState.at(position) != Empty)
++turnNumber;
}
myState = newState;
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);
}</pre>
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