2 * Copyright (c) 2016 Samsung Electronics Co., Ltd All Rights Reserved
4 * Licensed under the Apache License, Version 2.0 (the License);
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an AS IS BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 namespace Tizen.Sensor
22 /// The Magnetometer class is used for registering callbacks for the magnetometer and getting the magnetometer data.
24 /// <since_tizen> 3 </since_tizen>
25 public sealed class Magnetometer : Sensor
27 private static string MagnetometerKey = "http://tizen.org/feature/sensor.magnetometer";
29 private event EventHandler<SensorAccuracyChangedEventArgs> _accuracyChanged;
31 /// Gets the X component of the magnetometer.
33 /// <since_tizen> 3 </since_tizen>
34 /// <value> X </value>
35 public float X { get; private set; } = float.MinValue;
38 /// Gets the Y component of the magnetometer.
40 /// <since_tizen> 3 </since_tizen>
41 /// <value> Y </value>
42 public float Y { get; private set; } = float.MinValue;
45 /// Gets the Z component of the magnetometer.
47 /// <since_tizen> 3 </since_tizen>
48 /// <value> Z </value>
49 public float Z { get; private set; } = float.MinValue;
52 /// Returns true or false based on whether magnetometer is supported by the device.
54 /// <since_tizen> 3 </since_tizen>
55 /// <value><c>true</c> if supported; otherwise <c>false</c>.</value>
56 public static bool IsSupported
60 Log.Info(Globals.LogTag, "Checking if the Magnetometer is supported");
61 return CheckIfSupported(SensorType.Magnetometer, MagnetometerKey);
66 /// Returns the number of magnetometers available on the device.
68 /// <since_tizen> 3 </since_tizen>
69 /// <value> The count of magnetometers. </value>
70 public static int Count
74 Log.Info(Globals.LogTag, "Getting the count of magnetometers");
80 /// Initializes a new instance of the <see cref="Tizen.Sensor.Magnetometer"/> class.
82 /// <since_tizen> 3 </since_tizen>
83 /// <feature>http://tizen.org/feature/sensor.magnetometer</feature>
84 /// <exception cref="ArgumentException">Thrown when an invalid argument is used.</exception>
85 /// <exception cref="NotSupportedException">Thrown when the sensor is not supported.</exception>
86 /// <exception cref="InvalidOperationException">Thrown when the operation is invalid for the current state.</exception>
87 /// <param name='index'>
88 /// Index. Default value for this is 0. Index refers to a particular magnetometer in case of multiple sensors.
90 public Magnetometer(uint index = 0) : base(index)
92 Log.Info(Globals.LogTag, "Creating Magnetometer object");
95 internal override SensorType GetSensorType()
97 return SensorType.Magnetometer;
101 /// An event handler for storing the callback functions for the event corresponding to the change in the magnetometer data.
103 /// <since_tizen> 3 </since_tizen>
105 public event EventHandler<MagnetometerDataUpdatedEventArgs> DataUpdated;
108 /// An event handler for accuracy changed events.
110 /// <since_tizen> 3 </since_tizen>
111 public event EventHandler<SensorAccuracyChangedEventArgs> AccuracyChanged
115 if (_accuracyChanged == null)
117 AccuracyListenStart();
119 _accuracyChanged += value;
123 _accuracyChanged -= value;
124 if (_accuracyChanged == null)
126 AccuracyListenStop();
131 private static int GetCount()
135 int error = Interop.SensorManager.GetSensorList(SensorType.Magnetometer, out list, out count);
136 if (error != (int)SensorError.None)
138 Log.Error(Globals.LogTag, "Error getting sensor list for magnetometer");
142 Interop.Libc.Free(list);
147 /// Read magnetometer data synchronously.
149 internal override void ReadData()
151 Interop.SensorEventStruct sensorData;
152 int error = Interop.SensorListener.ReadData(ListenerHandle, out sensorData);
153 if (error != (int)SensorError.None)
155 Log.Error(Globals.LogTag, "Error reading magnetometer data");
156 throw SensorErrorFactory.CheckAndThrowException(error, "Reading magnetometer data failed");
159 Timestamp = sensorData.timestamp;
160 X = sensorData.values[0];
161 Y = sensorData.values[1];
162 Z = sensorData.values[2];
165 private static Interop.SensorListener.SensorEventsCallback _callback;
167 internal override void EventListenStart()
169 _callback = (IntPtr sensorHandle, IntPtr eventPtr, uint events_count, IntPtr data) => {
170 updateBatchEvents(eventPtr, events_count);
171 Interop.SensorEventStruct sensorData = latestEvent();
173 Timestamp = sensorData.timestamp;
174 X = sensorData.values[0];
175 Y = sensorData.values[1];
176 Z = sensorData.values[2];
178 DataUpdated?.Invoke(this, new MagnetometerDataUpdatedEventArgs(sensorData.values));
181 int error = Interop.SensorListener.SetEventsCallback(ListenerHandle, _callback, IntPtr.Zero);
182 if (error != (int)SensorError.None)
184 Log.Error(Globals.LogTag, "Error setting event callback for magnetometer");
185 throw SensorErrorFactory.CheckAndThrowException(error, "Unable to set event callback for magnetometer");
189 internal override void EventListenStop()
191 int error = Interop.SensorListener.UnsetEventsCallback(ListenerHandle);
192 if (error != (int)SensorError.None)
194 Log.Error(Globals.LogTag, "Error unsetting event callback for magnetometer");
195 throw SensorErrorFactory.CheckAndThrowException(error, "Unable to unset event callback for magnetometer");
199 private static Interop.SensorListener.SensorAccuracyCallback _accuracyCallback;
201 private void AccuracyListenStart()
203 _accuracyCallback = (IntPtr sensorHandle, UInt64 timestamp, SensorDataAccuracy accuracy, IntPtr data) => {
204 Timestamp = timestamp;
205 _accuracyChanged?.Invoke(this, new SensorAccuracyChangedEventArgs(timestamp, accuracy));
208 int error = Interop.SensorListener.SetAccuracyCallback(ListenerHandle, _accuracyCallback, IntPtr.Zero);
209 if (error != (int)SensorError.None)
211 Log.Error(Globals.LogTag, "Error setting accuracy event callback for magnetometer");
212 throw SensorErrorFactory.CheckAndThrowException(error, "Unable to set accuracy event callback for magnetometer");
216 private void AccuracyListenStop()
218 int error = Interop.SensorListener.UnsetAccuracyCallback(ListenerHandle);
219 if (error != (int)SensorError.None)
221 Log.Error(Globals.LogTag, "Error unsetting accuracy event callback for magnetometer");
222 throw SensorErrorFactory.CheckAndThrowException(error, "Unable to unset accuracy event callback for magnetometer");