source: trunk/examples/widgets/wiggly/wigglywidget.cpp@ 5

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information ([email protected])
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui>

#include "wigglywidget.h"

//! [0]
WigglyWidget::WigglyWidget(QWidget *parent)
    : QWidget(parent)
{
    setBackgroundRole(QPalette::Midlight);
    setAutoFillBackground(true);

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

    step = 0;
    timer.start(60, this);
}
//! [0]

//! [1]
void WigglyWidget::paintEvent(QPaintEvent * /* event */)
//! [1] //! [2]
{
    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;
//! [2]

//! [3]
    QPainter painter(this);
//! [3] //! [4]
    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]);
    }
}
//! [4]

//! [5]
void WigglyWidget::timerEvent(QTimerEvent *event)
//! [5] //! [6]
{
    if (event->timerId() == timer.timerId()) {
        ++step;
        update();
    } else {
        QWidget::timerEvent(event);
    }
//! [6]
}