blob: ec59a38f5bd5cf51e4a5ade3c1b95a736f648bf9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "boxdatareader.h"
#include <algorithm>
BoxDataReader::BoxDataReader(QIODevice *device) :
QTextStream(device)
{
}
void BoxDataReader::readFile(QIODevice *device)
{
QTextStream::setDevice(device);
}
QBoxSet *BoxDataReader::readBox()
{
//! [1]
QString line = readLine();
if (line.startsWith("#"))
return 0;
//! [1]
//! [2]
QStringList strList = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);
//! [2]
//! [3]
sortedList.clear();
for (int i = 1; i < strList.count(); i++)
sortedList.append(strList.at(i).toDouble());
std::sort(sortedList.begin(), sortedList.end());
//! [3]
int count = sortedList.count();
//! [4]
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));
//! [4]
return box;
}
qreal BoxDataReader::findMedian(int begin, int end)
{
//! [5]
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;
}
//! [5]
}
|
