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

# window.cpp Example File

painting/concentriccircles/window.cpp

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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    #include "circlewidget.h"
    #include "window.h"

    #include <QtWidgets>

    Window::Window()
    {
        aliasedLabel = createLabel(tr("Aliased"));
        antialiasedLabel = createLabel(tr("Antialiased"));
        intLabel = createLabel(tr("Int"));
        floatLabel = createLabel(tr("Float"));

        QGridLayout *layout = new QGridLayout;
        layout->addWidget(aliasedLabel, 0, 1);
        layout->addWidget(antialiasedLabel, 0, 2);
        layout->addWidget(intLabel, 1, 0);
        layout->addWidget(floatLabel, 2, 0);

        QTimer *timer = new QTimer(this);

        for (int i = 0; i < 2; ++i) {
            for (int j = 0; j < 2; ++j) {
                circleWidgets[i][j] = new CircleWidget;
                circleWidgets[i][j]->setAntialiased(j != 0);
                circleWidgets[i][j]->setFloatBased(i != 0);

                connect(timer, SIGNAL(timeout()),
                        circleWidgets[i][j], SLOT(nextAnimationFrame()));

                layout->addWidget(circleWidgets[i][j], i + 1, j + 1);
            }
        }
        timer->start(100);
        setLayout(layout);

        setWindowTitle(tr("Concentric Circles"));
    }

    QLabel *Window::createLabel(const QString &text)
    {
        QLabel *label = new QLabel(text);
        label->setAlignment(Qt::AlignCenter);
        label->setMargin(2);
        label->setFrameStyle(QFrame::Box | QFrame::Sunken);
        return label;
    }