qt5base-lts/examples/statemachine/rogue/window.cpp

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#include <QtWidgets>

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

//![0]
Window::Window()
{
    pX = 5;
    pY = 5;
//![0]

    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);

//![1]
    setupMap();
    buildMachine();
}
//![1]

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));
}

//![2]
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);
//![2]

//![3]
    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);
//![3]

//![4]
    QKeyEventTransition *quitTransition =
        new QKeyEventTransition(this, QEvent::KeyPress, Qt::Key_Q);
    quitTransition->setTargetState(quitState);
    inputState->addTransition(quitTransition);
//![4]

//![5]
    machine->setInitialState(inputState);

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

    machine->start();
}
//![5]

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] = '.';
    }
}