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/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "boxdatareader.h"
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BoxDataReader::BoxDataReader(QIODevice *device) :
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QTextStream(device)
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{
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}
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void BoxDataReader::readFile(QIODevice *device)
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{
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QTextStream::setDevice(device);
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}
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QBoxSet *BoxDataReader::readBox()
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{
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//! [1]
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QString line = readLine();
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if (line.startsWith("#"))
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return 0;
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//! [1]
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//! [2]
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QStringList strList = line.split(" ", QString::SkipEmptyParts);
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//! [2]
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//! [3]
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sortedList.clear();
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for (int i = 1; i < strList.count(); i++)
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sortedList.append(strList.at(i).toDouble());
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qSort(sortedList.begin(), sortedList.end());
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//! [3]
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int count = sortedList.count();
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//! [4]
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QBoxSet *box = new QBoxSet(strList.first());
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box->setValue(QBoxSet::LowerExtreme, sortedList.first());
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box->setValue(QBoxSet::UpperExtreme, sortedList.last());
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box->setValue(QBoxSet::Median, findMedian(0, count));
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box->setValue(QBoxSet::LowerQuartile, findMedian(0, count / 2));
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box->setValue(QBoxSet::UpperQuartile, findMedian(count / 2 + (count % 2), count));
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//! [4]
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return box;
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}
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qreal BoxDataReader::findMedian(int begin, int end)
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{
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//! [5]
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int count = end - begin;
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if (count % 2) {
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return sortedList.at(count / 2 + begin);
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} else {
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qreal right = sortedList.at(count / 2 + begin);
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qreal left = sortedList.at(count / 2 - 1 + begin);
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return (right + left) / 2.0;
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}
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//! [5]
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}
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