1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the QtSensors module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
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
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include <QDebug>
41
42#include "qshake2recognizer.h"
43#include <math.h>
44
45
46QT_BEGIN_NAMESPACE
47
48QShake2SensorGestureRecognizer::QShake2SensorGestureRecognizer(QObject *parent)
49 : QSensorGestureRecognizer(parent)
50 , active(0)
51 , shakeDirection(QShake2SensorGestureRecognizer::ShakeUndefined)
52 , shaking(0)
53 , shakeCount(0)
54 , lapsedTime(0)
55 , lastTimestamp(0),
56 timerActive(0)
57{
58 timerTimeout = 250;
59}
60
61QShake2SensorGestureRecognizer::~QShake2SensorGestureRecognizer()
62{
63}
64
65void QShake2SensorGestureRecognizer::create()
66{
67}
68
69bool QShake2SensorGestureRecognizer::start()
70{
71 if (QtSensorGestureSensorHandler::instance()->startSensor(sensor: QtSensorGestureSensorHandler::Accel)) {
72 active = true;
73 connect(sender: QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)),
74 receiver: this,SLOT(accelChanged(QAccelerometerReading*)));
75 } else {
76 active = false;
77 }
78 prevData.x = 0;
79 prevData.y = 0;
80 prevData.z = 0;
81 shakeCount = 0;
82 shaking = false;
83 shakeDirection = QShake2SensorGestureRecognizer::ShakeUndefined;
84
85 return active;
86}
87
88bool QShake2SensorGestureRecognizer::stop()
89{
90 QtSensorGestureSensorHandler::instance()->stopSensor(sensor: QtSensorGestureSensorHandler::Accel);
91 disconnect(sender: QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)),
92 receiver: this,SLOT(accelChanged(QAccelerometerReading*)));
93 active = false;
94 return active;
95}
96
97bool QShake2SensorGestureRecognizer::isActive()
98{
99 return active;
100}
101
102QString QShake2SensorGestureRecognizer::id() const
103{
104 return QString("QtSensors.shake2");
105}
106
107#define NUMBER_SHAKES 3
108#define THRESHOLD 25
109
110void QShake2SensorGestureRecognizer::accelChanged(QAccelerometerReading *reading)
111{
112 const qreal x = reading->x();
113 const qreal y = reading->y();
114 const qreal z = reading->z();
115
116 const quint64 timestamp = reading->timestamp();
117
118 currentData.x = x;
119 currentData.y = y;
120 currentData.z = z;
121
122 if (qAbs(t: prevData.x - currentData.x) < 1
123 && qAbs(t: prevData.y - currentData.y) < 1
124 && qAbs(t: prevData.z - currentData.z) < 1) {
125
126 prevData.x = currentData.x;
127 prevData.y = currentData.y;
128 prevData.z = currentData.z;
129 return;
130 }
131
132 bool wasShake;
133 wasShake = checkForShake(prevSensorData: prevData, currentSensorData: currentData, THRESHOLD);
134
135 if (!shaking && wasShake &&
136 shakeCount == NUMBER_SHAKES) {
137 shaking = true;
138 shakeCount = 0;
139 lapsedTime = 0;
140 timerActive = false;
141 switch (shakeDirection) {
142 case QShake2SensorGestureRecognizer::ShakeLeft:
143 Q_EMIT shakeLeft();
144 Q_EMIT detected("shakeLeft");
145 break;
146 case QShake2SensorGestureRecognizer::ShakeRight:
147 Q_EMIT shakeRight();
148 Q_EMIT detected("shakeRight");
149 break;
150 case QShake2SensorGestureRecognizer::ShakeUp:
151 Q_EMIT shakeUp();
152 Q_EMIT detected("shakeUp");
153 break;
154 case QShake2SensorGestureRecognizer::ShakeDown:
155 Q_EMIT shakeDown();
156 Q_EMIT detected("shakeDown");
157 break;
158 default:
159 break;
160 };
161
162 } else if (wasShake) {
163
164 if (shakeCount == 0 && shakeDirection == QShake2SensorGestureRecognizer::ShakeUndefined) {
165
166 const int xdiff = prevData.x - currentData.x;
167 const int ydiff = prevData.x - currentData.y;
168
169 const int max = qMax(a: qAbs(t: ydiff), b: qAbs(t: xdiff));
170 if (max == qAbs(t: xdiff)) {
171 if (isNegative(num: xdiff))
172 shakeDirection = QShake2SensorGestureRecognizer::ShakeLeft;
173 else
174 shakeDirection = QShake2SensorGestureRecognizer::ShakeRight;
175
176 } else if (max == qAbs(t: ydiff)) {
177 if (isNegative(num: ydiff))
178 shakeDirection = QShake2SensorGestureRecognizer::ShakeDown;
179 else
180 shakeDirection = QShake2SensorGestureRecognizer::ShakeUp;
181 }
182 }
183 shakeCount++;
184 if (shakeCount == NUMBER_SHAKES) {
185 timerActive = true;
186 }
187 }
188
189 if (timerActive && lastTimestamp > 0)
190 lapsedTime += (timestamp - lastTimestamp )/1000;
191
192 if (timerActive && lapsedTime >= timerTimeout) {
193 timeout();
194 }
195 prevData.x = currentData.x;
196 prevData.y = currentData.y;
197 prevData.z = currentData.z;
198 lastTimestamp = timestamp;
199}
200
201void QShake2SensorGestureRecognizer::timeout()
202{
203 shakeCount = 0;
204 shaking = false;
205 shakeDirection = QShake2SensorGestureRecognizer::ShakeUndefined;
206 timerActive = false;
207 lapsedTime = 0;
208 lastTimestamp = 0;
209}
210
211bool QShake2SensorGestureRecognizer::checkForShake(ShakeData prevSensorData, ShakeData currentSensorData, qreal threshold)
212{
213 const double deltaX = qAbs(t: prevSensorData.x - currentSensorData.x);
214 const double deltaY = qAbs(t: prevSensorData.y - currentSensorData.y);
215 const double deltaZ = qAbs(t: prevSensorData.z - currentSensorData.z);
216
217 return (deltaX > threshold
218 || deltaY > threshold
219 || deltaZ > threshold);
220}
221
222bool QShake2SensorGestureRecognizer::isNegative(qreal num)
223{
224 if (num < 0)
225 return true;
226 return false;
227}
228
229
230
231QT_END_NAMESPACE
232

source code of qtsensors/src/plugins/sensorgestures/qtsensors/qshake2recognizer.cpp