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/****************************************************************************
**
** Copyright (C) 2012 Lorn Potter
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtSensors module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <UIKit/UIAccelerometer.h>
#include <CoreMotion/CMMotionManager.h>
#include <QPointer>
#include "iosaccelerometer.h"
#include "iosmotionmanager.h"
char const * const IOSAccelerometer::id("ios.accelerometer");
QT_BEGIN_NAMESPACE
IOSAccelerometer::IOSAccelerometer(QSensor *sensor)
: QSensorBackend(sensor)
, m_updateQueue([[NSOperationQueue alloc] init])
{
setReading<QAccelerometerReading>(&m_reading);
addDataRate(1, 100); // 100Hz
addOutputRange(-22.418, 22.418, 0.17651); // 2G
}
IOSAccelerometer::~IOSAccelerometer()
{
[m_updateQueue release];
}
void IOSAccelerometer::start()
{
CMMotionManager *motionManager = [QIOSMotionManager sharedManager];
// Convert from Hz to NSTimeInterval:
int hz = sensor()->dataRate();
motionManager.accelerometerUpdateInterval = (hz == 0) ? 0 : 1. / hz;
QPointer<QObject> self = this;
[motionManager startAccelerometerUpdatesToQueue:m_updateQueue withHandler:^(CMAccelerometerData *data, NSError *error) {
// NSOperationQueue is multi-threaded, so we process the data by queuing a callback to
// the main application queue. By the time the callback executes, IOSAccelerometer might
// have been deleted, so we need an extra QPointer check for that:
dispatch_async(dispatch_get_main_queue(), ^{
if (self) {
Q_UNUSED(error);
// Convert from NSTimeInterval to microseconds and G to m/s2, and flip axes:
CMAcceleration acc = data.acceleration;
const qreal G = 9.8066;
m_reading.setTimestamp(quint64(data.timestamp * 1000000));
m_reading.setX(qreal(acc.x) * G * -1);
m_reading.setY(qreal(acc.y) * G * -1);
m_reading.setZ(qreal(acc.z) * G * -1);
newReadingAvailable();
}
});
}];
}
void IOSAccelerometer::stop()
{
[[QIOSMotionManager sharedManager] stopAccelerometerUpdates];
}
QT_END_NAMESPACE
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