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// Copyright (C) 2016 Lorn Potter
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <qmath.h>
#include "qfreefallsensorgesturerecognizer.h"
QT_BEGIN_NAMESPACE
QFreefallSensorGestureRecognizer::QFreefallSensorGestureRecognizer(QObject *parent)
: QSensorGestureRecognizer(parent)
, active(0)
, detecting(0)
{
}
QFreefallSensorGestureRecognizer::~QFreefallSensorGestureRecognizer()
{
}
void QFreefallSensorGestureRecognizer::create()
{
}
QString QFreefallSensorGestureRecognizer::id() const
{
return QString("QtSensors.freefall");
}
bool QFreefallSensorGestureRecognizer::start()
{
if (QtSensorGestureSensorHandler::instance()->startSensor(QtSensorGestureSensorHandler::Accel)) {
active = true;
connect(QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)),
this,SLOT(accelChanged(QAccelerometerReading*)));
} else {
active = false;
}
return active;
}
bool QFreefallSensorGestureRecognizer::stop()
{
QtSensorGestureSensorHandler::instance()->stopSensor(QtSensorGestureSensorHandler::Accel);
disconnect(QtSensorGestureSensorHandler::instance(),SIGNAL(accelReadingChanged(QAccelerometerReading*)),
this,SLOT(accelChanged(QAccelerometerReading*)));
active = false;
return active;
}
bool QFreefallSensorGestureRecognizer::isActive()
{
return active;
}
#define FREEFALL_THRESHOLD 1.0
#define LANDED_THRESHOLD 20.0
#define FREEFALL_MAX 4
void QFreefallSensorGestureRecognizer::accelChanged(QAccelerometerReading *reading)
{
const qreal x = reading->x();
const qreal y = reading->y();
const qreal z = reading->z();
qreal sum = qSqrt(x * x + y * y + z * z);
if (qAbs(sum) < FREEFALL_THRESHOLD) {
detecting = true;
freefallList.append(sum);
} else {
if (detecting && qAbs(sum) > LANDED_THRESHOLD) {
Q_EMIT landed();
Q_EMIT detected("landed");
freefallList.clear();
}
}
if (freefallList.count() > FREEFALL_MAX) {
Q_EMIT freefall();
Q_EMIT detected("freefall");
}
}
QT_END_NAMESPACE
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