private void RwyComboBoxIndexChanged(object sender, EventArgs e)
{
if (rwyComboBox.Items.Count > 0)
{
var takeoffAirport = Airports[Icao];
int index = rwyComboBox.SelectedIndex;
int elevationFt = takeoffAirport.Rwys[index].Elevation;
int lengthFt = takeoffAirport.Rwys[index].LengthFt;
SetLength(lengthFt);
elevationTxtBox.Text = elevationFt.ToString();
var heading = takeoffAirport.Rwys[index].Heading;
rwyHeadingTxtBox.Text = heading.PadLeft(3, '0');
var oppositeId = RwyIdentConversion.RwyIdentOppositeDir(rwyComboBox.Text);
if (oppositeId == null)
{
SetSlope(0.0);
return;
}
var opposite = takeoffAirport.FindRwy(oppositeId);
var slope = opposite == null
? 0.0
: (opposite.Elevation - elevationFt) * 100.0 / lengthFt;
SetSlope(slope);
}
}
// Returns null if the runway or the opposite runway cannot be found.
public static double?GetSlopePercent(this IAirport a, string runway)
{
var rwy = a.FindRwy(runway);
if (rwy == null)
{
return(null);
}
var oppositeId = RwyIdentConversion.RwyIdentOppositeDir(runway);
if (oppositeId == null)
{
return(null);
}
var opposite = a.FindRwy(oppositeId);
if (opposite == null)
{
return(null);
}
return((opposite.ElevationFt - rwy.ElevationFt) * 100.0 / rwy.LengthFt);
}