Source code
Revision control
Copy as Markdown
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "tictactoe.h"
#include <QMouseEvent>
#include <QPainter>
using namespace Qt::StringLiterals;
static inline QString defaultState() { return u"---------"_s; }
TicTacToe::TicTacToe(QWidget *parent)
: QWidget(parent), myState(defaultState())
{
}
QSize TicTacToe::minimumSizeHint() const
{
return {200, 200};
}
QSize TicTacToe::sizeHint() const
{
return {200, 200};
}
void TicTacToe::setState(const QString &newState)
{
turnNumber = 0;
myState = defaultState();
const int count = qMin(9, int(newState.length()));
for (int position = 0; position < count; ++position) {
const QChar mark = newState.at(position);
if (mark == Cross || mark == Nought) {
++turnNumber;
myState[position] = mark;
}
}
update();
}
QString TicTacToe::state() const
{
return myState;
}
void TicTacToe::clearBoard()
{
myState = defaultState();
turnNumber = 0;
update();
}
void TicTacToe::mousePressEvent(QMouseEvent *event)
{
if (turnNumber == 9) {
clearBoard();
return;
}
for (int position = 0; position < 9; ++position) {
const QRect &cell = cellRect(position);
if (cell.contains(event->position().toPoint())) {
if (myState.at(position) == Empty) {
myState[position] = turnNumber % 2 == 0
? Cross : 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) {
const QRect &cell = cellRect(position);
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)) {
const int y = cellRect(position).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)) {
const int x = cellRect(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 position) const
{
const int HMargin = width() / 30;
const int VMargin = height() / 30;
const int row = position / 3;
const int column = position % 3;
const QPoint pos{column * cellWidth() + HMargin,
row * cellHeight() + VMargin};
const QSize size{cellWidth() - 2 * HMargin,
cellHeight() - 2 * VMargin};
return {pos, size};
}