boxdatareader.cpp Example File

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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;
      }
  }