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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "boxplotdatareader.h"
#include <QBoxSet>
#include <algorithm>
BoxPlotDataReader::BoxPlotDataReader(QIODevice *device)
: m_textStream(device)
{
}
void BoxPlotDataReader::readFile(QIODevice *device)
{
m_textStream.setDevice(device);
}
bool BoxPlotDataReader::atEnd() const
{
return m_textStream.atEnd();
}
QBoxSet *BoxPlotDataReader::readBox()
{
//! [1]
QString line = m_textStream.readLine();
if (line.startsWith("#"))
return nullptr;
//! [1]
//! [2]
QStringList strList = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
//! [2]
//! [3]
m_sortedList.clear();
for (int i = 1; i < strList.count(); i++)
m_sortedList.append(strList.at(i).toDouble());
std::sort(m_sortedList.begin(), m_sortedList.end());
//! [3]
int count = m_sortedList.count();
//! [4]
auto box = new QBoxSet(strList.first());
box->setValue(QBoxSet::LowerExtreme, m_sortedList.first());
box->setValue(QBoxSet::UpperExtreme, m_sortedList.last());
box->setValue(QBoxSet::Median, findMedian(0, count));
box->setValue(QBoxSet::LowerQuartile, findMedian(0, count / 2));
box->setValue(QBoxSet::UpperQuartile, findMedian(count / 2 + (count % 2), count));
//! [4]
return box;
}
qreal BoxPlotDataReader::findMedian(int begin, int end)
{
//! [5]
int count = end - begin;
if (count % 2) {
return m_sortedList.at(count / 2 + begin);
} else {
qreal right = m_sortedList.at(count / 2 + begin);
qreal left = m_sortedList.at(count / 2 - 1 + begin);
return (right + left) / 2.0;
}
//! [5]
}
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