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    41 

    42 #include <QtGui>

    43 #include "helper.h"

    44 

    45 //! [0]

    46 Helper::Helper()

    47 {

    48     QLinearGradient gradient(QPointF(50, -20), QPointF(80, 20));

    49     gradient.setColorAt(0.0, Qt::white);

    50     gradient.setColorAt(1.0, QColor(0xa6, 0xce, 0x39));

    51 

    52     background = QBrush(QColor(64, 32, 64));

    53     circleBrush = QBrush(gradient);

    54     circlePen = QPen(Qt::black);

    55     circlePen.setWidth(1);

    56     textPen = QPen(Qt::white);

    57     textFont.setPixelSize(50);

    58 }

    59 //! [0]

    60 

    61 //! [1]

    62 void Helper::paint(QPainter *painter, QPaintEvent *event, int elapsed)

    63 {

    64     painter->fillRect(event->rect(), background);

    65     painter->translate(100, 100);

    66 //! [1]

    67 

    68 //! [2]

    69     painter->save();

    70     painter->setBrush(circleBrush);

    71     painter->setPen(circlePen);

    72     painter->rotate(elapsed * 0.030);

    73 

    74     qreal r = elapsed/1000.0;

    75     int n = 30;

    76     for (int i = 0; i < n; ++i) {

    77         painter->rotate(30);

    78         qreal radius = 0 + 120.0*((i+r)/n);

    79         qreal circleRadius = 1 + ((i+r)/n)*20;

    80         painter->drawEllipse(QRectF(radius, -circleRadius,

    81                                     circleRadius*2, circleRadius*2));

    82     }

    83     painter->restore();

    84 //! [2]

    85 

    86 //! [3]

    87     painter->setPen(textPen);

    88     painter->setFont(textFont);

    89     painter->drawText(QRect(-50, -50, 100, 100), Qt::AlignCenter, "Qt");

    90 }

    91 //! [3]