boxdatareader.cpp Example File
boxplotchart/boxdatareader.cpp
#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;
}
}