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#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]