Qt Reference Documentation

# piechart.cpp Example File

declarative/tutorials/extending/chapter2-methods/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;
     }

     void PieChart::setColor(const QColor &color)
     {
         m_color = color;
     }

     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();

         emit chartCleared();
     }