source: trunk/examples/declarative/tutorials/extending/chapter3-bindings/piechart.cpp

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#include "piechart.h"
#include <QPainter>
#include <QDebug>

PieChart::PieChart(QDeclarativeItem *parent)
    : QDeclarativeItem(parent)
{
    // need to disable this flag to draw inside a QDeclarativeItem
    setFlag(QGraphicsItem::ItemHasNoContents, false);
}

QString PieChart::name() const
{
    return m_name;
}

void PieChart::setName(const QString &name)
{
    m_name = name;
}

QColor PieChart::color() const
{
    return m_color;
}

//![0]
void PieChart::setColor(const QColor &color)
{
    if (color != m_color) {
        m_color = color;
        update();   // repaint with the new color
        emit colorChanged();
    }
}
//![0]

void PieChart::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
    QPen pen(m_color, 2);
    painter->setPen(pen);
    painter->setRenderHints(QPainter::Antialiasing, true);
    painter->drawPie(boundingRect(), 90 * 16, 290 * 16);
}

void PieChart::clearChart()
{
    setColor(QColor(Qt::transparent));
    update();
}