Linux开发实例程序

#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]; }