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Qt4 How to draw inside a widget?

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Qt4, QtCreator

I am trying to draw inside Widget:

void Widget::on_pushButton_clicked()
    QPainter painter;


    QRectF rectangle(10.0, 20.0, 80.0, 60.0);
     int startAngle = 30 * 16;
     int spanAngle = 120 * 16;
     painter.drawArc(rectangle, startAngle, spanAngle);


But when I press button nothing happens.

How to do this right way?

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