public static IEnumerable<TimeDoubleDataEntry> GenerateRandomData(
DateTime startTime,
TimeSpan timeRange,
long numOfPoints,
double maxValue,
double minValue,
double rippleFactor)
{
var points = new List<TimeDoubleDataEntry>();
var point = new TimeDoubleDataEntry(startTime, 0);
var stepSize = timeRange.TotalSeconds / numOfPoints;
for (long i = 0; i < numOfPoints; i++)
{
// distance +- 5 from previous point
var delta = Random.NextDouble() * rippleFactor;
// pos or neg?
if (Random.Next(0, 2) == 0)
delta = -delta;
var y = point.Y + delta;
if (y > maxValue)
y = maxValue;
else if (y < minValue)
y = minValue;
point = new TimeDoubleDataEntry(point.X.AddSeconds(stepSize), y);
points.Add(point);
}
return points;
}
/// <summary>
/// Gets a value for a given point in time.
/// </summary>
/// <param name="dateTime">The point in time.</param>
/// <param name="leftValue">The value in a series that lies directly left of the time.</param>
/// <param name="rightValue">The value in a series that lies directly right of the time.</param>
/// <returns>The value.</returns>
public double GetMiddleValue(DateTime dateTime, TimeDoubleDataEntry leftValue, TimeDoubleDataEntry rightValue)
{
return MathHelper.LinearInterpolation(
leftValue.X.Ticks,
leftValue.Y,
rightValue.X.Ticks,
rightValue.Y,
dateTime.Ticks);
}
private IEnumerable<TimeDoubleDataEntry> CreatePoints(TimeSpan timeRange, bool append)
{
var points = new List<TimeDoubleDataEntry>();
var point = append ? GetLastPointOrDefault() : GetFirstPointOrDefault();
if (double.IsNaN(point.Y))
point = new TimeDoubleDataEntry(point.X, Offset);
var numOfSteps = (long)(NumberOfPointsPerSecond * timeRange.TotalSeconds);
var stepSize = timeRange.TotalSeconds / numOfSteps;
for (long i = 0; i < numOfSteps; i++)
{
// Abstand +- 5 vom vorherigen Punkt
var delta = _random.NextDouble() * _yStepSize;
// Pos oder Neg?
if (_random.Next(0, 2) == 0)
delta = -delta;
var y = point.Y + delta;
if (y > MaxValue)
y = MaxValue;
else if (y < MinValue)
y = MinValue;
point = append
? new TimeDoubleDataEntry(point.X.AddSeconds(stepSize), y)
: new TimeDoubleDataEntry(point.X.AddSeconds(-stepSize), y);
points.Add(point);
}
return points;
}
