private static void TestCurve(Vector2 start, Vector2 end)
{
const float amplitude = 1;
const float waveLength = 1;
// Linear and non-linear curves should start at same position
float progress = 0;
Vector2 lerpValue = Vector2.Lerp(start, end, progress);
Vector2 sCurveValue = NonLinearity.SinusOffset(lerpValue, start, end, amplitude, waveLength);
Assert.AreEqual(sCurveValue.Y, lerpValue.Y);
// S-Curve should start out below the linear ascent
progress = 0.25f;
lerpValue = Vector2.Lerp(start, end, progress);
sCurveValue = NonLinearity.SinusOffset(lerpValue, start, end, amplitude, waveLength);
Assert.Less(sCurveValue.Y, lerpValue.Y);
// After catching up the S-Curve should now be above the linear interpolation
progress = 0.75f;
lerpValue = Vector2.Lerp(start, end, progress);
sCurveValue = NonLinearity.SinusOffset(lerpValue, start, end, amplitude, waveLength);
Assert.Greater(sCurveValue.Y, lerpValue.Y);
// Linear and non-linear curves should end at same position
progress = 1.0f;
lerpValue = Vector2.Lerp(start, end, progress);
sCurveValue = NonLinearity.SinusOffset(lerpValue, start, end, amplitude, waveLength);
Assert.AreEqual(sCurveValue.Y, lerpValue.Y);
}
public float GetSimulatedStaticPressure(float trueAltitude)
{
float truePressure = StaticPressureHelper.GetPressure(trueAltitude, SeaLevelStaticPresure);
// If we assume the pressure is rising linearly (although it is not) we would want to further distort the
// measured pressure by applying non-linearity to the readings.
Vector2 lowestPressurePlot = GetPressurePlot(StaticPressureHelper.MinAltitude);
Vector2 highestPressurePlot = GetPressurePlot(StaticPressureHelper.MaxAltitude);
var pressurePlot = new Vector2(trueAltitude, truePressure);
// float nonLinearPressure = NonLinearity.SinusOffset(pressurePlot, lowestPressurePlot, highestPressurePlot).Y;
float nonLinearPressure =
NonLinearity.SinusOffset(pressurePlot, lowestPressurePlot, highestPressurePlot, 5f, 100).Y;
// Noise amplitude is selected to give a few meters of variation, both positive and negative
const float pressurePerMeter = 11.989f;
const float noiseAmplitudeMeters = 0.5f;
const float noiseAmplitudePressure = noiseAmplitudeMeters * pressurePerMeter;
return(Noise.WhiteNoise(nonLinearPressure, noiseAmplitudePressure));
}