- Qt 5.5
- Qt Widgets
- Rogue Example
- window.cpp Example File
- Qt 5.5.1 Reference Documentation

# window.cpp Example File

statemachine/rogue/window.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
    **
    ** "Redistribution and use in source and binary forms, with or without
    ** modification, are permitted provided that the following conditions are
    ** met:
    **   * Redistributions of source code must retain the above copyright
    **     notice, this list of conditions and the following disclaimer.
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    **     notice, this list of conditions and the following disclaimer in
    **     the documentation and/or other materials provided with the
    **     distribution.
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    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
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    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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    #include <QtWidgets>

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

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

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

                double x1 = static_cast<double>(pX);
                double y1 = static_cast<double>(pY);
                double x2 = static_cast<double>(x);
                double y2 = static_cast<double>(y);

                if (x2<x1) {
                    x2+=0.5;
                } else if (x2>x1) {
                     x2-=0.5;
                }

                if (y2<y1) {
                     y2+=0.5;
                } else if (y2>y1) {
                     y2-=0.5;
                }

                double dx = x2 - x1;
                double dy = y2 - y1;

                double length = qSqrt(dx*dx+dy*dy);

                dx /= length;
                dy /= length;

                double xi = x1;
                double yi = y1;

                while (length > 0) {
                    int cx = static_cast<int>(xi+0.5);
                    int cy = static_cast<int>(yi+0.5);

                    if (x2 == cx && y2 == cy)
                        break;

                    if (!(x1==cx && y1==cy)
                        && (map[cx][cy] == '#' || (length-10) > 0)) {
                        painter.setPen(QColor(60,60,60));
                        break;
                    }

                    xi += dx;
                    yi += dy;
                    --length;
                }

                painter.drawText(QPoint(xPos, yPos), map[x][y]);
                xPos += fontWidth;
            }
        }
        painter.setPen(Qt::white);
        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] = '.';
        }
    }