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painter.setRenderHint(QPainter::Antialiasing, true);
painter.setPen(QPen(QColor(0, 0, 255), 30, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
painter.drawPath(path);
painter.setPen(QPen(Qt::yellow, 20, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
painter.drawPath(path);
painter.setPen(QPen(Qt::red, 10, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
painter.drawPath(path);