boxdatareader.cpp Example File

boxplotchart/boxdatareader.cpp
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#include "boxdatareader.h" BoxDataReader::BoxDataReader(QIODevice *device) : QTextStream(device) { } void BoxDataReader::readFile(QIODevice *device) { QTextStream::setDevice(device); } QBoxSet *BoxDataReader::readBox() { QString line = readLine(); if (line.startsWith("#")) return 0; QStringList strList = line.split(" ", QString::SkipEmptyParts); sortedList.clear(); for (int i = 1; i < strList.count(); i++) sortedList.append(strList.at(i).toDouble()); qSort(sortedList.begin(), sortedList.end()); int count = sortedList.count(); QBoxSet *box = new QBoxSet(strList.first()); box->setValue(QBoxSet::LowerExtreme, sortedList.first()); box->setValue(QBoxSet::UpperExtreme, 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)); return box; } qreal BoxDataReader::findMedian(int begin, int end) { int count = end - begin; if (count % 2) { return sortedList.at(count / 2 + begin); } else { qreal right = sortedList.at(count / 2 + begin); qreal left = sortedList.at(count / 2 - 1 + begin); return (right + left) / 2.0; } }