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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore>
#include "logfilepositionsource.h"
LogFilePositionSource::LogFilePositionSource(QObject *parent)
: QGeoPositionInfoSource(parent),
logFile(new QFile(this)),
timer(new QTimer(this))
{
connect(timer, SIGNAL(timeout()), this, SLOT(readNextPosition()));
logFile->setFileName(":/simplelog.txt");
if (!logFile->open(QIODevice::ReadOnly))
qWarning() << "Error: cannot open source file" << logFile->fileName();
}
QGeoPositionInfo LogFilePositionSource::lastKnownPosition(bool /*fromSatellitePositioningMethodsOnly*/) const
{
return lastPosition;
}
LogFilePositionSource::PositioningMethods LogFilePositionSource::supportedPositioningMethods() const
{
return AllPositioningMethods;
}
int LogFilePositionSource::minimumUpdateInterval() const
{
return 500;
}
void LogFilePositionSource::startUpdates()
{
int interval = updateInterval();
if (interval < minimumUpdateInterval())
interval = minimumUpdateInterval();
timer->start(interval);
}
void LogFilePositionSource::stopUpdates()
{
timer->stop();
}
void LogFilePositionSource::requestUpdate(int /*timeout*/)
{
// For simplicity, ignore timeout - assume that if data is not available
// now, no data will be added to the file later
if (logFile->canReadLine())
readNextPosition();
else
emit updateTimeout();
}
void LogFilePositionSource::readNextPosition()
{
QByteArray line = logFile->readLine().trimmed();
if (!line.isEmpty()) {
QList<QByteArray> data = line.split(' ');
double latitude;
double longitude;
bool hasLatitude = false;
bool hasLongitude = false;
QDateTime timestamp = QDateTime::fromString(QString(data.value(0)), Qt::ISODate);
latitude = data.value(1).toDouble(&hasLatitude);
longitude = data.value(2).toDouble(&hasLongitude);
if (hasLatitude && hasLongitude && timestamp.isValid()) {
QGeoCoordinate coordinate(latitude, longitude);
QGeoPositionInfo info(coordinate, timestamp);
if (info.isValid()) {
lastPosition = info;
emit positionUpdated(info);
}
}
}
}
QGeoPositionInfoSource::Error LogFilePositionSource::error() const
{
return QGeoPositionInfoSource::NoError;
}
|
