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2 | ** |
3 | ** Copyright (C) 2016 Lorn Potter |
4 | ** Contact: https://www.qt.io/licensing/ |
5 | ** |
6 | ** This file is part of the QtSensors module of the Qt Toolkit. |
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8 | ** $QT_BEGIN_LICENSE:LGPL$ |
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26 | ** Alternatively, this file may be used under the terms of the GNU |
27 | ** General Public License version 2.0 or (at your option) the GNU General |
28 | ** Public license version 3 or any later version approved by the KDE Free |
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38 | ****************************************************************************/ |
39 | #include <qmath.h> |
40 | |
41 | #include "qfreefallsensorgesturerecognizer.h" |
42 | |
43 | QT_BEGIN_NAMESPACE |
44 | |
45 | QFreefallSensorGestureRecognizer::QFreefallSensorGestureRecognizer(QObject *parent) |
46 | : QSensorGestureRecognizer(parent) |
47 | , active(0) |
48 | , detecting(0) |
49 | { |
50 | } |
51 | |
52 | QFreefallSensorGestureRecognizer::~QFreefallSensorGestureRecognizer() |
53 | { |
54 | } |
55 | |
56 | void QFreefallSensorGestureRecognizer::create() |
57 | { |
58 | } |
59 | |
60 | QString QFreefallSensorGestureRecognizer::id() const |
61 | { |
62 | return QString("QtSensors.freefall" ); |
63 | } |
64 | |
65 | bool QFreefallSensorGestureRecognizer::start() |
66 | { |
67 | if (QtSensorGestureSensorHandler::instance()->startSensor(sensor: QtSensorGestureSensorHandler::Accel)) { |
68 | active = true; |
69 | connect(sender: QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)), |
70 | receiver: this,SLOT(accelChanged(QAccelerometerReading*))); |
71 | } else { |
72 | active = false; |
73 | } |
74 | return active; |
75 | |
76 | } |
77 | |
78 | bool QFreefallSensorGestureRecognizer::stop() |
79 | { |
80 | QtSensorGestureSensorHandler::instance()->stopSensor(sensor: QtSensorGestureSensorHandler::Accel); |
81 | disconnect(sender: QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)), |
82 | receiver: this,SLOT(accelChanged(QAccelerometerReading*))); |
83 | active = false; |
84 | |
85 | return active; |
86 | } |
87 | |
88 | bool QFreefallSensorGestureRecognizer::isActive() |
89 | { |
90 | return active; |
91 | } |
92 | |
93 | #define FREEFALL_THRESHOLD 1.0 |
94 | #define LANDED_THRESHOLD 20.0 |
95 | #define FREEFALL_MAX 4 |
96 | |
97 | void QFreefallSensorGestureRecognizer::accelChanged(QAccelerometerReading *reading) |
98 | { |
99 | const qreal x = reading->x(); |
100 | const qreal y = reading->y(); |
101 | const qreal z = reading->z(); |
102 | qreal sum = qSqrt(v: x * x + y * y + z * z); |
103 | |
104 | if (qAbs(t: sum) < FREEFALL_THRESHOLD) { |
105 | detecting = true; |
106 | freefallList.append(t: sum); |
107 | } else { |
108 | if (detecting && qAbs(t: sum) > LANDED_THRESHOLD) { |
109 | Q_EMIT landed(); |
110 | Q_EMIT detected("landed" ); |
111 | freefallList.clear(); |
112 | } |
113 | } |
114 | |
115 | if (freefallList.count() > FREEFALL_MAX) { |
116 | Q_EMIT freefall(); |
117 | Q_EMIT detected("freefall" ); |
118 | } |
119 | } |
120 | |
121 | |
122 | QT_END_NAMESPACE |
123 | |
124 | |