Qt 4.6: window.cpp Example File (statemachine/rogue/window.cpp)

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# window.cpp Example File
statemachine/rogue/window.cpp

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     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the documentation of the Qt Toolkit.
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     ** contained in the Technology Preview License Agreement accompanying
     ** this package.
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     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
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     #include <QtGui>

     #include "window.h"
     #include "movementtransition.h"

     Window::Window()
     {
         pX = 5;
         pY = 5;

         QFontDatabase database;
         QFont font;
         if (database.families().contains("Monospace"))
             font = QFont("Monospace", 12);
         else {
             foreach (QString family, database.families()) {
                 if (database.isFixedPitch(family)) {
                     font = QFont(family, 12);
                     break;
                 }
             }
         }
         setFont(font);

         setupMap();
         buildMachine();
     }

     void Window::setStatus(const QString &status)
     {
         myStatus = status;
         repaint();
     }

     QString Window::status() const
     {
         return myStatus;
     }

     void Window::paintEvent(QPaintEvent * /* event */)
     {
         QFontMetrics metrics(font());
         QPainter painter(this);
         int fontHeight = metrics.height();
         int fontWidth = metrics.width('X');
         int yPos = fontHeight;
         int xPos;

         painter.fillRect(rect(), Qt::black);
         painter.setPen(Qt::white);

         painter.drawText(QPoint(0, yPos), status());

         for (int y = 0; y < HEIGHT; ++y) {
             yPos += fontHeight;
             xPos = 0;

             for (int x = 0; x < WIDTH; ++x) {
                 if (y == pY && x == pX) {
                     xPos += fontWidth;
                     continue;
                 }

                 painter.drawText(QPoint(xPos, yPos), map[x][y]);
                 xPos += fontWidth;
             }
         }
         painter.drawText(QPoint(pX * fontWidth, (pY + 2) * fontHeight), QChar('@'));
     }

     QSize Window::sizeHint() const
     {
         QFontMetrics metrics(font());

         return QSize(metrics.width('X') * WIDTH, metrics.height() * (HEIGHT + 1));
     }

     void Window::buildMachine()
     {
         machine = new QStateMachine;

         QState *inputState = new QState(machine);
         inputState->assignProperty(this, "status", "Move the rogue with 2, 4, 6, and 8");

         MovementTransition *transition = new MovementTransition(this);
         inputState->addTransition(transition);

         QState *quitState = new QState(machine);
         quitState->assignProperty(this, "status", "Really quit(y/n)?");

         QKeyEventTransition *yesTransition = new
             QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Y);
         yesTransition->setTargetState(new QFinalState(machine));
         quitState->addTransition(yesTransition);

         QKeyEventTransition *noTransition =
             new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_N);
         noTransition->setTargetState(inputState);
         quitState->addTransition(noTransition);

         QKeyEventTransition *quitTransition =
             new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Q);
         quitTransition->setTargetState(quitState);
         inputState->addTransition(quitTransition);

         machine->setInitialState(inputState);

         connect(machine, SIGNAL(finished()), qApp, SLOT(quit()));

         machine->start();
     }

     void Window::movePlayer(Direction direction)
     {
         switch (direction) {
             case Left:
                 if (map[pX - 1][pY] != '#')
                     --pX;
                 break;
             case Right:
                 if (map[pX + 1][pY] != '#')
                     ++pX;
                 break;
             case Up:
                 if (map[pX][pY - 1] != '#')
                     --pY;
                 break;
             case Down:
                 if (map[pX][pY + 1] != '#')
                     ++pY;
                 break;
         }
         repaint();
     }

     void Window::setupMap()
     {
         qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));

         for (int x = 0; x < WIDTH; ++x)
             for (int y = 0; y < HEIGHT; ++y) {
             if (x == 0 || x == WIDTH - 1 || y == 0 || y == HEIGHT - 1 || qrand() % 40 == 0)
                 map[x][y] = '#';
             else
                 map[x][y] = '.';
         }
     }