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29
30#include "boxdatareader.h"
31
32#include <algorithm>
33
34BoxDataReader::BoxDataReader(QIODevice *device) :
35 QTextStream(device)
36{
37}
38
39void BoxDataReader::readFile(QIODevice *device)
40{
41 QTextStream::setDevice(device);
42}
43
44QBoxSet *BoxDataReader::readBox()
45{
46 //! [1]
47 QString line = readLine();
48 if (line.startsWith(s: "#"))
49 return 0;
50 //! [1]
51
52 //! [2]
53 QStringList strList = line.split(sep: QLatin1Char(' '), behavior: Qt::SkipEmptyParts);
54 //! [2]
55
56 //! [3]
57 sortedList.clear();
58 for (int i = 1; i < strList.count(); i++)
59 sortedList.append(t: strList.at(i).toDouble());
60
61 std::sort(first: sortedList.begin(), last: sortedList.end());
62 //! [3]
63
64 int count = sortedList.count();
65
66 //! [4]
67 QBoxSet *box = new QBoxSet(strList.first());
68 box->setValue(index: QBoxSet::LowerExtreme, value: sortedList.first());
69 box->setValue(index: QBoxSet::UpperExtreme, value: sortedList.last());
70 box->setValue(index: QBoxSet::Median, value: findMedian(begin: 0, end: count));
71 box->setValue(index: QBoxSet::LowerQuartile, value: findMedian(begin: 0, end: count / 2));
72 box->setValue(index: QBoxSet::UpperQuartile, value: findMedian(begin: count / 2 + (count % 2), end: count));
73 //! [4]
74
75 return box;
76}
77
78qreal BoxDataReader::findMedian(int begin, int end)
79{
80 //! [5]
81 int count = end - begin;
82 if (count % 2) {
83 return sortedList.at(i: count / 2 + begin);
84 } else {
85 qreal right = sortedList.at(i: count / 2 + begin);
86 qreal left = sortedList.at(i: count / 2 - 1 + begin);
87 return (right + left) / 2.0;
88 }
89 //! [5]
90}
91

source code of qtcharts/examples/charts/boxplotchart/boxdatareader.cpp