private DataGenerator CreateGenerator(SimulatorItem item)
{
switch (item.Id)
{
case ItemId.SawtoothWave:
case ItemId.SineWave:
case ItemId.SquareWave:
case ItemId.TriangleWave:
case ItemId.WhiteNoise:
{
NumericScale scale = ((NumericTag)item).Scale;
return(new WaveFormGenerator(GetWaveForm(item.Id), scale));
}
case ItemId.IncrementalCount:
{
NumericScale scale = ((NumericTag)item).Scale;
return(new CountGenerator(scale));
}
case ItemId.ModulatedPulse:
case ItemId.PeriodicPulse:
return(new DiscreteGenerator(item.Id == ItemId.PeriodicPulse));
case ItemId.TimeText:
return(new TextGenerator());
default:
throw new InvalidOperationException("Invalid tag id.");
}
}
public override int GetHashCode()
{
int result = ProviderType != null?ProviderType.GetHashCode() : 0;
result = 29 * result + (DataTypeName != null ? DataTypeName.GetHashCode() : 0);
result = 29 * result + NumericPrecision.GetHashCode();
result = 29 * result + NumericScale.GetHashCode();
result = 29 * result + ColumnSize.GetHashCode();
result = 29 * result + IsLong.GetHashCode();
return(result);
}
protected override object GetValueAtTime(DateTime time)
{
if (_periodic)
{
// Reference: https://en.wikipedia.org/wiki/Pulse_wave
NumericScale scale = new NumericScale(-1, 1);
var generator = new WaveFormGenerator(WaveForm.Sawtooth, scale);
// use a 25% duty cycle (25% of 2 = 0.5)
return(generator.GetValue(time, 20) >= 0.5f);
}
else
{
// Reference: https://en.wikipedia.org/wiki/Pulse-width_modulation
NumericScale scale = new NumericScale(0, 100);
var sawToothGenerator = new WaveFormGenerator(WaveForm.Sawtooth, scale);
var sineGenerator = new WaveFormGenerator(WaveForm.Sine, scale);
return(sawToothGenerator.GetValue(time) < sineGenerator.GetValue(time));
}
}
public WaveFormGenerator(WaveForm waveForm, NumericScale scale)
{
_waveForm = waveForm;
_scale = scale;
}
/// <summary>
/// Get datatype description
/// </summary>
/// <returns>datatype description</returns>
public string GetDataTypeDescription()
{
return(SqlCreator.GetSQLServerDataType(DataType, ColumnSize.ToString(), NumericPrecision.ToString(), NumericScale.ToString()));
}
public CountGenerator(NumericScale scale)
{
_scale = scale;
}