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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#import <CoreLocation/CLHeading.h>
#import <CoreLocation/CLLocationManagerDelegate.h>
#include <QtCore/qglobal.h>
#include "ioscompass.h"
char const * const IOSCompass::id("ios.compass");
QT_BEGIN_NAMESPACE
@interface locationDelegate : NSObject <CLLocationManagerDelegate>
{
IOSCompass *m_iosCompass;
}
@end
@implementation locationDelegate
- (id)initWithQIOSCompass:(IOSCompass*)iosCompass
{
self = [super init];
if (self) {
m_iosCompass = iosCompass;
}
return self;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
Q_UNUSED(manager);
// Convert NSDate to microseconds:
quint64 timestamp = quint64(newHeading.timestamp.timeIntervalSinceReferenceDate * 1e6);
double accuracy = newHeading.headingAccuracy;
// Accuracy is the maximum number of degrees the reading can be off. The QtSensors scale
// goes from 1 to 0, with 1 being the best (0 degrees off), and 0 worst (360 degrees off):
qreal calibrationLevel = (accuracy < 0) ? 0 : qMax(0., 1 - (accuracy / 360));
qreal heading = qreal(newHeading.magneticHeading);
m_iosCompass->headingChanged(heading, timestamp, calibrationLevel);
}
- (BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager *)manager
{
Q_UNUSED(manager);
return YES;
}
@end
IOSCompass::IOSCompass(QSensor *sensor)
: QSensorBackend(sensor)
, m_locationManager(0)
{
setReading<QCompassReading>(&m_reading);
addDataRate(1, 70);
addOutputRange(0, 359, 1);
}
IOSCompass::~IOSCompass()
{
[m_locationManager release];
}
void IOSCompass::start()
{
if (!m_locationManager) {
m_locationManager = [[CLLocationManager alloc] init];
m_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
m_locationManager.headingFilter = kCLHeadingFilterNone;
m_locationManager.delegate = [[locationDelegate alloc] initWithQIOSCompass:this];
}
[m_locationManager startUpdatingHeading];
}
void IOSCompass::headingChanged(qreal heading, quint64 timestamp, qreal calibrationLevel)
{
m_reading.setAzimuth(heading);
m_reading.setTimestamp(timestamp);
m_reading.setCalibrationLevel(calibrationLevel);
newReadingAvailable();
}
void IOSCompass::stop()
{
[m_locationManager stopUpdatingHeading];
}
QT_END_NAMESPACE
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