我正在为Windows Phone 7.1（Mango）编写一个小样本应用程序，并希望使用Combined Motion API来显示设备的运动。我需要编写模拟类，以便在使用不支持设备所有传感器的仿真器时测试我的应用程序。
我已经编写了一个简单的模拟类来模拟指南针（它只是模拟旋转设备）和模拟器中实际可用的加速度计。
现在我必须为Motion API编写一个新的模拟对象，但我希望我可以使用罗盘和加速度计的值来计算用于Motion对象的值。不幸的是，我发现没有任何样本可用于进行简单的转换。
有人知道进行此转换的代码示例吗？如果已经有了解决方案，那么我自己也不愿意这样做。
答案 0 :(得分：1)
进行Mockup工作的一个很好的起点是查看Motion API及其内部工作原理以及API核心使用的参数：
http://msdn.microsoft.com/en-us/library/hh202984%28VS.92%29.aspx
在继续之前，请记住Motion API是复杂的数学模型，它结合了不同手机传感器的输入。您可以通过组合加速度，位置和旋转来找到许多不同的模型来计算运动。您可以在本文中找到一个很好的描述：
http://www.instructables.com/id/Accelerometer-Gyro-Tutorial/
所以实际上，你必须使用上面文章中显示的方程式和函数，然后自己计算这些值。
除了简单的事情之外，这是其他所有事情，但可能就是这样。
我希望我能够帮助你:)让社区知道，如果你已经完成了。我认为一个codeplex项目很适合为windows phone motion API编写一种模拟实用程序。
答案 1 :(得分：1)
我现在再次遇到同样的问题，因为Windows Phone 8已经用完了，我还没有手机可以测试。
与WP7 Mock Microsoft.Devices.Sensors.Compass when using the emulator的答案非常相似，我创建了a wrapper class with the same methods as the Motion API。当支持实际的Motion API时，会使用它。否则，在调试模式下，将返回模拟数据，这会改变滚动，俯仰和偏航。
<强> MotionWrapper
/// <summary>
/// Provides Windows Phone applications information about the device’s orientation and motion.
/// </summary>
public class MotionWrapper //: SensorBase<MotionReading> // No public constructors, nice one.
{
private Motion motion;
public event EventHandler<SensorReadingEventArgs<MockMotionReading>> CurrentValueChanged;
#region Properties
/// <summary>
/// Gets or sets the preferred time between Microsoft.Devices.Sensors.SensorBase<TSensorReading>.CurrentValueChanged events.
/// </summary>
public virtual TimeSpan TimeBetweenUpdates
{
get
{
return motion.TimeBetweenUpdates;
}
set
{
motion.TimeBetweenUpdates = value;
}
}
/// <summary>
/// Gets or sets whether the device on which the application is running supports the sensors required by the Microsoft.Devices.Sensors.Motion class.
/// </summary>
public static bool IsSupported
{
get
{
#if(DEBUG)
return true;
#else
return Motion.IsSupported;
#endif
}
}
#endregion
#region Constructors
protected MotionWrapper()
{
}
protected MotionWrapper(Motion motion)
{
this.motion = motion;
this.motion.CurrentValueChanged += motion_CurrentValueChanged;
}
#endregion
/// <summary>
/// Get an instance of the MotionWrappper that supports the Motion API
/// </summary>
/// <returns></returns>
public static MotionWrapper Instance()
{
#if(DEBUG)
if (!Motion.IsSupported)
{
return new MockMotionWrapper();
}
#endif
return new MotionWrapper(new Motion());
}
/// <summary>
/// The value from the underlying Motion API has changed. Relay it on within a MockMotionReading.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void motion_CurrentValueChanged(object sender, SensorReadingEventArgs<MotionReading> e)
{
var f = new SensorReadingEventArgs<MockMotionReading>();
f.SensorReading = new MockMotionReading(e.SensorReading);
RaiseValueChangedEvent(sender, f);
}
protected void RaiseValueChangedEvent(object sender, SensorReadingEventArgs<MockMotionReading> e)
{
if (CurrentValueChanged != null)
{
CurrentValueChanged(this, e);
}
}
/// <summary>
/// Starts acquisition of data from the sensor.
/// </summary>
public virtual void Start()
{
motion.Start();
}
/// <summary>
/// Stops acquisition of data from the sensor.
/// </summary>
public virtual void Stop()
{
motion.Stop();
}
}
MockMotionWrapper
/// <summary>
/// Provides Windows Phone applications mock information about the device’s orientation and motion.
/// </summary>
public class MockMotionWrapper : MotionWrapper
{
/// <summary>
/// Use a timer to trigger simulated data updates.
/// </summary>
private DispatcherTimer timer;
private MockMotionReading lastCompassReading = new MockMotionReading(true);
#region Properties
/// <summary>
/// Gets or sets the preferred time between Microsoft.Devices.Sensors.SensorBase<TSensorReading>.CurrentValueChanged events.
/// </summary>
public override TimeSpan TimeBetweenUpdates
{
get
{
return timer.Interval;
}
set
{
timer.Interval = value;
}
}
#endregion
#region Constructors
public MockMotionWrapper()
{
timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(30);
timer.Tick += new EventHandler(timer_Tick);
}
#endregion
void timer_Tick(object sender, EventArgs e)
{
var reading = new Microsoft.Devices.Sensors.SensorReadingEventArgs<MockMotionReading>();
lastCompassReading = new MockMotionReading(lastCompassReading);
reading.SensorReading = lastCompassReading;
//if (lastCompassReading.HeadingAccuracy > 20)
//{
// RaiseValueChangedEvent(this, new CalibrationEventArgs());
//}
RaiseValueChangedEvent(this, reading);
}
/// <summary>
/// Starts acquisition of data from the sensor.
/// </summary>
public override void Start()
{
timer.Start();
}
/// <summary>
/// Stops acquisition of data from the sensor.
/// </summary>
public override void Stop()
{
timer.Stop();
}
}
MockMotionReading
//Microsoft.Devices.Sensors.MotionReading
/// <summary>
/// Contains information about the orientation and movement of the device.
/// </summary>
public struct MockMotionReading : Microsoft.Devices.Sensors.ISensorReading
{
public static bool RequiresCalibration = false;
#region Properties
/// <summary>
/// Gets the attitude (yaw, pitch, and roll) of the device, in radians.
/// </summary>
public MockAttitudeReading Attitude { get; internal set; }
/// <summary>
/// Gets the linear acceleration of the device, in gravitational units.
/// </summary>
public Vector3 DeviceAcceleration { get; internal set; }
/// <summary>
/// Gets the rotational velocity of the device, in radians per second.
/// </summary>
public Vector3 DeviceRotationRate { get; internal set; }
/// <summary>
/// Gets the gravity vector associated with the Microsoft.Devices.Sensors.MotionReading.
/// </summary>
public Vector3 Gravity { get; internal set; }
/// <summary>
/// Gets a timestamp indicating the time at which the accelerometer reading was
/// taken. This can be used to correlate readings across sensors and provide
/// additional input to algorithms that process raw sensor data.
/// </summary>
public DateTimeOffset Timestamp { get; internal set; }
#endregion
#region Constructors
/// <summary>
/// Initialize an instance from an actual MotionReading
/// </summary>
/// <param name="cr"></param>
public MockMotionReading(MotionReading cr)
: this()
{
this.Attitude = new MockAttitudeReading(cr.Attitude);
this.DeviceAcceleration = cr.DeviceAcceleration;
this.DeviceRotationRate = cr.DeviceRotationRate;
this.Gravity = cr.Gravity;
this.Timestamp = cr.Timestamp;
}
/// <summary>
/// Create an instance initialized with testing data
/// </summary>
/// <param name="test"></param>
public MockMotionReading(bool test)
: this()
{
float pitch = 0.01f;
float roll = 0.02f;
float yaw = 0.03f;
this.Attitude = new MockAttitudeReading()
{
Pitch = pitch,
Roll = roll,
Yaw = yaw,
RotationMatrix = Matrix.CreateFromYawPitchRoll(yaw, pitch, roll),
Quaternion = Quaternion.CreateFromYawPitchRoll(yaw, pitch, roll),
Timestamp = DateTimeOffset.Now
};
// TODO: pull data from the Accelerometer
this.Gravity = new Vector3(0, 0, 1f);
}
/// <summary>
/// Create a new mock instance based on the previous mock instance
/// </summary>
/// <param name="lastCompassReading"></param>
public MockMotionReading(MockMotionReading lastCompassReading)
: this()
{
// Adjust the pitch, roll, and yaw as required.
// -90 to 90 deg
float pitchDegrees = MathHelper.ToDegrees(lastCompassReading.Attitude.Pitch) - 0.5f;
//pitchDegrees = ((pitchDegrees + 90) % 180) - 90;
// -90 to 90 deg
float rollDegrees = MathHelper.ToDegrees(lastCompassReading.Attitude.Roll);
//rollDegrees = ((rollDegrees + 90) % 180) - 90;
// 0 to 360 deg
float yawDegrees = MathHelper.ToDegrees(lastCompassReading.Attitude.Yaw) + 0.5f;
//yawDegrees = yawDegrees % 360;
float pitch = MathHelper.ToRadians(pitchDegrees);
float roll = MathHelper.ToRadians(rollDegrees);
float yaw = MathHelper.ToRadians(yawDegrees);
this.Attitude = new MockAttitudeReading()
{
Pitch = pitch,
Roll = roll,
Yaw = yaw,
RotationMatrix = Matrix.CreateFromYawPitchRoll(yaw, pitch, roll),
Quaternion = Quaternion.CreateFromYawPitchRoll(yaw, pitch, roll),
Timestamp = DateTimeOffset.Now
};
this.DeviceAcceleration = lastCompassReading.DeviceAcceleration;
this.DeviceRotationRate = lastCompassReading.DeviceRotationRate;
this.Gravity = lastCompassReading.Gravity;
Timestamp = DateTime.Now;
}
#endregion
}
MockAttitudeReading
public struct MockAttitudeReading : ISensorReading
{
public MockAttitudeReading(AttitudeReading attitudeReading) : this()
{
Pitch = attitudeReading.Pitch;
Quaternion = attitudeReading.Quaternion;
Roll = attitudeReading.Roll;
RotationMatrix = attitudeReading.RotationMatrix;
Timestamp = attitudeReading.Timestamp;
Yaw = attitudeReading.Yaw;
}
/// <summary>
/// Gets the pitch of the attitude reading in radians.
/// </summary>
public float Pitch { get; set; }
/// <summary>
/// Gets the quaternion representation of the attitude reading.
/// </summary>
public Quaternion Quaternion { get; set; }
/// <summary>
/// Gets the roll of the attitude reading in radians.
/// </summary>
public float Roll { get; set; }
/// <summary>
/// Gets the matrix representation of the attitude reading.
/// </summary>
public Matrix RotationMatrix { get; set; }
/// <summary>
/// Gets a timestamp indicating the time at which the accelerometer reading was
/// taken. This can be used to correlate readings across sensors and provide
/// additional input to algorithms that process raw sensor data.
/// </summary>
public DateTimeOffset Timestamp { get; set; }
/// <summary>
/// Gets the yaw of the attitude reading in radians.
/// </summary>
public float Yaw { get; set; }
}