/// Output a Wind Heading and velocity sentence with this format:
/// MWV,x.x,R,v.v,M,A
/// x.x = relative heading of the wind
/// R = relative
/// v.v = the wind velocity in MPH
/// M/N/K = mph, knots, kph
private void ParseWindSpeedAndVelocity(string talkerId, string[] words, string sentence)
{
if (words.Length != 6)
{
DebugLog.WriteLine("invalid MWV sentence: " + sentence);
return;
}
int relativeHeading;
double velocity;
try
{
int period = words[1].IndexOf('.');
if (period > 0)
{
relativeHeading = Int32.Parse(words[1].Substring(0, period));
}
else
{
relativeHeading = Int32.Parse(words[1]);
}
velocity = Double.Parse(words[3]);
}
catch (Exception e)
{
DebugLog.WriteLine("Could not parse: " + sentence + " e:" + e.ToString());
return;
}
// convert velocity to knots
switch (words[4])
{
case "M":
velocity *= 0.868976242;
break;
case "K":
velocity *= 0.539956803;
break;
case "N":
// velocity is already in knots
break;
default:
DebugLog.WriteLine("Invalid wind speed: " + sentence);
return;
}
DebugLog.WriteLine("Wind velocity update: h=" + relativeHeading + " v=" + velocity);
if (WindEvent != null)
{
var args = new NmeaWindEventArgs(relativeHeading, velocity);
WindEvent(this, args);
}
}
void m_nmeaInputPort_WindEvent(object sender, NmeaWindEventArgs args)
{
DisplayVariables.WindDirection.Value = args.RelativeHeading;
DisplayVariables.WindSpeed.Value = args.Velocity;
}