/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui>
#include "helper.h"

//! [0]
Helper::Helper()
{
    QLinearGradient gradient(QPointF(50, -20), QPointF(80, 20));
    gradient.setColorAt(0.0, Qt::white);
    gradient.setColorAt(1.0, QColor(0xa6, 0xce, 0x39));

    background = QBrush(QColor(64, 32, 64));
    circleBrush = QBrush(gradient);
    circlePen = QPen(Qt::black);
    circlePen.setWidth(1);
    textPen = QPen(Qt::white);
    textFont.setPixelSize(50);
}
//! [0]

//! [1]
void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)
{
    painter->fillRect(event->rect(), background);
    painter->translate(100, 100);
//! [1]

//! [2]
    painter->save();
    painter->setBrush(circleBrush);
    painter->setPen(circlePen);
    painter->rotate(elapsed * 0.030);

    qreal r = elapsed/1000.0;
    int n = 30;
    for (int i = 0; i < n; ++i) {
        painter->rotate(30);
        qreal radius = 0 + 120.0*((i+r)/n);
        qreal circleRadius = 1 + ((i+r)/n)*20;
        painter->drawEllipse(QRectF(radius, -circleRadius,
                                    circleRadius*2, circleRadius*2));
    }
    painter->restore();
//! [2]

//! [3]
    painter->setPen(textPen);
    painter->setFont(textFont);
    painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, "Qt");
}
//! [3]
