Qt 4.0: wigglywidget.cpp Example File (widgets/wiggly/wigglywidget.cpp)

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# wigglywidget.cpp Example File
widgets/wiggly/wigglywidget.cpp

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** and appearing in the file LICENSE.GPL included in the packaging of
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        #include <QtGui>

        #include "wigglywidget.h"

        WigglyWidget::WigglyWidget(QWidget *parent)
            : QWidget(parent)
        {
            setBackgroundRole(QPalette::Midlight);

            QFont newFont = font();
            newFont.setPointSize(newFont.pointSize() + 20);
            setFont(newFont);

            step = 0;
            timer.start(60, this);
        }

        void WigglyWidget::paintEvent(QPaintEvent * /* event */)
        {
            static const int sineTable[16] = {
                0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38
            };

            QFontMetrics metrics(font());
            int x = (width() - metrics.width(text)) / 2;
            int y = (height() + metrics.ascent() - metrics.descent()) / 2;
            QColor color;

            QPainter painter(this);
            for (int i = 0; i < text.size(); ++i) {
                int index = (step + i) % 16;
                color.setHsv((15 - index) * 16, 255, 191);
                painter.setPen(color);
                painter.drawText(x, y - ((sineTable[index] * metrics.height()) / 400),
                                 QString(text[i]));
                x += metrics.width(text[i]);
            }
        }

        void WigglyWidget::timerEvent(QTimerEvent *event)
        {
            if (event->timerId() == timer.timerId()) {
                ++step;
                update();
            } else {
                QWidget::timerEvent(event);
            }
        }