/// <summary>
/// Selects a runway with most headwind component. Returns its ident.
/// </summary>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="InvalidOperationException">rwys is empty</exception>
public static string MaxHeadwind(this IEnumerable <IRwyData> rwys, double windHeading)
{
return(rwys
.Where(r => r.Heading.IsDouble())
.MaxBy(r => ConversionTools.HeadwindComponent(
double.Parse(r.Heading), windHeading, 1.0))
.RwyIdent);
}
/// <exception cref="InvalidUserInputException"></exception>
public LandingParameters Validate()
{
var e = elements;
double weightKg = 0.0;
double rwyLengthMeter = 0.0;
double elevationFt = 0.0;
double headwindKts = 0.0;
double slopePercent = 0.0;
double tempCelsius = 0.0;
double qnh = 0.0;
double appSpeedIncrease = 0.0;
int reverser = 0;
int surfaceCondition = 0;
int flapsIndex = 0;
int brakeIndex = 0;
try
{
weightKg = Convert.ToDouble(e.Weight.Text);
if (e.WtUnit.SelectedIndex == 1) //LB
{
weightKg *= Constants.LbKgRatio;
}
if (weightKg < 0)
{
throw new InvalidUserInputException("Landing weight is not valid.");
}
}
catch
{
throw new InvalidUserInputException("Landing weight is not valid.");
}
try
{
rwyLengthMeter = Convert.ToDouble(e.Length.Text);
if (e.LengthUnit.SelectedIndex == 1) // FT
{
rwyLengthMeter *= Constants.FtMeterRatio;
}
if (rwyLengthMeter < 0)
{
throw new InvalidUserInputException("Runway length is not valid.");
}
}
catch
{
throw new InvalidUserInputException("Runway length is not valid.");
}
try
{
elevationFt = Convert.ToDouble(e.Elevation.Text);
if (elevationFt < -2000.0 || elevationFt > 20000.0)
{
throw new InvalidUserInputException("Runway elevation is not valid.");
}
}
catch
{
throw new InvalidUserInputException("Runway elevation is not valid.");
}
try
{
headwindKts = ConversionTools.HeadwindComponent(
Convert.ToDouble(e.RwyHeading.Text),
Convert.ToDouble(e.WindDirection.Text),
Convert.ToDouble(e.WindSpeed.Text));
}
catch
{
throw new InvalidUserInputException("Wind entry is not valid.");
}
try
{
slopePercent = Convert.ToDouble(e.Slope.Text);
}
catch
{
throw new InvalidUserInputException("Runway slope is not valid.");
}
try
{
tempCelsius = Convert.ToDouble(e.Oat.Text);
if (e.TempUnit.SelectedIndex == 1) // deg F
{
tempCelsius = ConversionTools.ToCelsius(tempCelsius);
}
}
catch
{
throw new InvalidUserInputException("OAT is not valid.");
}
try
{
qnh = Convert.ToDouble(e.Pressure.Text);
if (e.PressureUnit.SelectedIndex == 1)
{
qnh *= 1013.0 / 29.92;
}
if (qnh <900.0 | qnh> 1100.0)
{
throw new InvalidUserInputException("Altimeter setting is not valid.");
}
}
catch
{
throw new InvalidUserInputException("Altimeter setting is not valid.");
}
try
{
appSpeedIncrease = double.Parse(e.AppSpeedIncrease.Text);
}
catch
{
throw new InvalidUserInputException("APP speed increase is not valid.");
}
try
{
reverser = e.Reverser.SelectedIndex;
}
catch
{
throw new InvalidUserInputException("Reverser selection is not valid.");
}
try
{
surfaceCondition = e.SurfCond.SelectedIndex;
}
catch
{
throw new InvalidUserInputException("Surface condition is not valid.");
}
flapsIndex = e.Flaps.SelectedIndex;
brakeIndex = e.Brake.SelectedIndex;
return(new LandingParameters(
weightKg,
rwyLengthMeter,
elevationFt,
headwindKts,
slopePercent,
tempCelsius,
qnh,
appSpeedIncrease,
reverser,
surfaceCondition,
flapsIndex,
brakeIndex));
}