- Qt 5.5
- Qt QML
- Writing QML Extensions with C++
- piechart.cpp Example File
- Qt 5.5.1 Reference Documentation

# piechart.cpp Example File

tutorials/extending-qml/chapter3-bindings/piechart.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    #include "piechart.h"
    #include <QPainter>

    PieChart::PieChart(QQuickItem *parent)
        : QQuickPaintedItem(parent)
    {
    }

    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)
    {
        if (color != m_color) {
            m_color = color;
            update();   // repaint with the new color
            emit colorChanged();
        }
    }

    void PieChart::paint(QPainter *painter)
    {
        QPen pen(m_color, 2);
        painter->setPen(pen);
        painter->setRenderHints(QPainter::Antialiasing, true);
        painter->drawPie(boundingRect().adjusted(1, 1, -1, -1), 90 * 16, 290 * 16);
    }

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