private void ReadingChanged(Accelerometer sender, AccelerometerReadingChangedEventArgs args)
{
var reading = args.Reading;
Vector current = new Vector(reading.AccelerationX, reading.AccelerationY, reading.AccelerationZ);
var delta = new Vector(current.X - _previousValue.X, current.Y - _previousValue.Y, current.Z - _previousValue.Z);
_previousValue = current;
if (delta.Length() > 1.0) {
Dispatcher.BeginInvoke(() => {
statusTextBlock.Text = "receiving data from accelerometer.";
// Show the numeric values
xTextBlock.Text = "X: " + reading.AccelerationX.ToString("0.00");
yTextBlock.Text = "Y: " + reading.AccelerationY.ToString("0.00");
zTextBlock.Text = "Z: " + reading.AccelerationZ.ToString("0.00");
// Show the values graphically
xLine.X2 = xLine.X1 + reading.AccelerationX * 100;
yLine.Y2 = yLine.Y1 - reading.AccelerationY * 100;
zLine.X2 = zLine.X1 - reading.AccelerationZ * 50;
zLine.Y2 = zLine.Y1 + reading.AccelerationZ * 50;
});
}
}
private void UpdateUI(SensorData.Vector reading)
{
ScenarioOutput_X.Text = String.Format("{0,5:0.00}", reading.X);
ScenarioOutput_Y.Text = String.Format("{0,5:0.00}", reading.Y);
ScenarioOutput_Z.Text = String.Format("{0,5:0.00}", reading.Z);
// Show the values graphically
xLine.X2 = xLine.X1 + reading.X * 100;
yLine.Y2 = yLine.Y1 - reading.Y * 100;
zLine.X2 = zLine.X1 - reading.Z * 50;
zLine.Y2 = zLine.Y1 + reading.Z * 50;
}
private void UpdateUI(SensorData.Vector reading)
{
statusTextBlock.Text = "Receiving data from accelerometer...";
// Show the numeric values
xTextBlock.Text = "X: " + reading.X.ToString("0.00");
yTextBlock.Text = "Y: " + reading.Y.ToString("0.00");
zTextBlock.Text = "Z: " + reading.Z.ToString("0.00");
// Show the values graphically
xLine.X2 = xLine.X1 + reading.X * 100;
yLine.Y2 = yLine.Y1 - reading.Y * 100;
zLine.X2 = zLine.X1 - reading.Z * 50;
zLine.Y2 = zLine.Y1 + reading.Z * 50;
}
public static IObservable<Vector> FindBigMovements(this IObservable<Vector> source)
{
// Use the Scan method to compare each element to the previous one
var deltas =
source.Scan(
new { last = new Vector(), delta = new Vector() },
(state, current) => {
var last = current;
var delta = new Vector(current.X - state.last.X, current.Y - state.last.Y, current.Z - state.last.Z);
return new { last, delta };
}
);
return deltas
.Where(d => d.delta.Length() > 1.0)
.Select(d => d.delta);
}
private static IEnumerable<Vector> EmulateAccelerometerReading()
{
// Create a random number generator
Random random = new Random();
// Loop indefinitely
for (double theta = 0; ; theta += .1) {
// Generate a Vector3 in which the values of each axes slowly drift between -1 and 1 and
Vector reading = new Vector((float)Math.Sin(theta), (float)Math.Cos(theta * 1.1), (float)Math.Sin(theta * .7));
// At random intervals, generate a random spike in the data
if (random.NextDouble() > .95) {
reading = new Vector((float)(random.NextDouble() * 3.0 - 1.5),
(float)(random.NextDouble() * 3.0 - 1.5),
(float)(random.NextDouble() * 3.0 - 1.5));
}
// return the vector and then sleep
yield return reading;
//Windows.System.Threading.Sleep(100);
Task.Delay(100).Wait();
}
}
