donutchart.cpp - mozsearch

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses

#include "charts.h"

#include <QtCharts/QChart>

#include <QtCharts/QPieSeries>

class DonutChart: public Chart

public:

    QString name() { return QObject::tr("DonutChart"); }

    QString category()  { return QObject::tr("PieSeries"); }

    QString subCategory() { return QString(); }

    QChart *createChart(const DataTable &table)

        QChart *chart = new QChart();

        chart->setTitle("Donut chart");

        for (int i = 0, j = table.count(); i < table.count(); i++, j--) {

            QPieSeries *series = new QPieSeries(chart);

            for (auto data : table[i]) {

                QPieSlice *slice = series->append(data.second, data.first.y());

                if (data == table[i].first())

                    slice->setLabelVisible();

            series->setPieSize(j / (qreal) table.count());

            if (j > 1)

                series->setHoleSize((j - 1) / (qreal) table.count() + 0.1);

            series->setHorizontalPosition(0.5);

            series->setVerticalPosition(0.5);

            chart->addSeries(series);

        return chart;

};

DECLARE_CHART(DonutChart)