Refresh problem with QPaintEvent

[rawfool]

I've created a dummy updater(singleshot timer, to update after few seconds) to update to new values.
Now I don't know whr to call updateGraph() function. I've done something like this, but it's not updating the graphs.
Can you give some sample code to handle this pls.

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    this->setMinimumSize(800, 250);
    QTimer::singleShot(5000, this, SLOT(updateGraph()));
}
 
Dialog::~Dialog()
{
}
 
 
void Dialog::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);
    QPainter painter(this);
    addGraphs(&painter, 20, 30, 50);
}
 
void Dialog::addGraphs(QPainter *qp, int i, int j, int k)
{
    Nightcharts chart1;
    chart1.setShadows(false);
    chart1.setType(Nightcharts::Pie);
    chart1.setLegendType(Nightcharts::Vertical);
    chart1.setCords(50, 50, 80, 80);
    chart1.addPiece("Item1",QColor(200,10,50), i);
    chart1.addPiece("Item2",Qt::green, j);
    chart1.addPiece("Item3",Qt::cyan, k);
    chart1.draw(qp);
    chart1.drawLegend(qp);
 
    Nightcharts chart2;
    chart2.setShadows(false);
    chart2.setType(Nightcharts::Pie);
    chart2.setLegendType(Nightcharts::Vertical);
    chart2.setCords(300, 50, 80, 80);
    chart2.addPiece("Item2",Qt::green, j);
    chart2.addPiece("Item3",Qt::cyan,k);
    chart2.addPiece("Item4",Qt::yellow,i);
    chart2.draw(qp);
    chart2.drawLegend(qp);
 
    Nightcharts chart3;
    chart3.setShadows(false);
    chart3.setType(Nightcharts::Pie);
    chart3.setLegendType(Nightcharts::Vertical);
    chart3.setCords(550, 50, 80, 80);
    chart3.addPiece("Item1",QColor(200,10,50), k);
    chart3.addPiece("Item3",Qt::cyan, i);
    chart3.addPiece("Item4",Qt::yellow, j);
    chart3.draw(qp);
    chart3.drawLegend(qp);
}
 
void Dialog::updateGraph()
{
    qDebug("Updating after 5 seconds");
    QPainter painter(this);
    addGraphs(&painter, 50, 20, 30);
    this->update();
}

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{
    this->setMinimumSize(800, 250);
    QTimer::singleShot(5000, this, SLOT(updateGraph()));
}

Dialog::~Dialog()
{
}


void Dialog::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);
    QPainter painter(this);
    addGraphs(&painter, 20, 30, 50);
}

void Dialog::addGraphs(QPainter *qp, int i, int j, int k)
{
    Nightcharts chart1;
    chart1.setShadows(false);
    chart1.setType(Nightcharts::Pie);
    chart1.setLegendType(Nightcharts::Vertical);
    chart1.setCords(50, 50, 80, 80);
    chart1.addPiece("Item1",QColor(200,10,50), i);
    chart1.addPiece("Item2",Qt::green, j);
    chart1.addPiece("Item3",Qt::cyan, k);
    chart1.draw(qp);
    chart1.drawLegend(qp);

    Nightcharts chart2;
    chart2.setShadows(false);
    chart2.setType(Nightcharts::Pie);
    chart2.setLegendType(Nightcharts::Vertical);
    chart2.setCords(300, 50, 80, 80);
    chart2.addPiece("Item2",Qt::green, j);
    chart2.addPiece("Item3",Qt::cyan,k);
    chart2.addPiece("Item4",Qt::yellow,i);
    chart2.draw(qp);
    chart2.drawLegend(qp);

    Nightcharts chart3;
    chart3.setShadows(false);
    chart3.setType(Nightcharts::Pie);
    chart3.setLegendType(Nightcharts::Vertical);
    chart3.setCords(550, 50, 80, 80);
    chart3.addPiece("Item1",QColor(200,10,50), k);
    chart3.addPiece("Item3",Qt::cyan, i);
    chart3.addPiece("Item4",Qt::yellow, j);
    chart3.draw(qp);
    chart3.drawLegend(qp);
}

void Dialog::updateGraph()
{
    qDebug("Updating after 5 seconds");
    QPainter painter(this);
    addGraphs(&painter, 50, 20, 30);
    this->update();
}

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