How can I draw on Qlabel

[validator]

I want to draw a shape on Qlabel but I can not draw anything in below code
.How can I do it

void MyPainter::paintEvent(QPaintEvent *event)
{
	QPainter painter(ui.label);
	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.setPen(QPen(Qt::black, 15, Qt::SolidLine, Qt::RoundCap,
		Qt::MiterJoin));
	painter.setBrush(QBrush(Qt::blue, Qt::DiagCrossPattern));
	painter.drawPie(80, 80, 400, 240, 60 * 16, 270 * 16);
 
}

void MyPainter::paintEvent(QPaintEvent *event)
{
	QPainter painter(ui.label);
	painter.setRenderHint(QPainter::Antialiasing, true);
	painter.setPen(QPen(Qt::black, 15, Qt::SolidLine, Qt::RoundCap,
		Qt::MiterJoin));
	painter.setBrush(QBrush(Qt::blue, Qt::DiagCrossPattern));
	painter.drawPie(80, 80, 400, 240, 60 * 16, 270 * 16);

}

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