private void UpdateDistBrg()
{
Distance = LatLongCalc.Distance(StartLat, StartLon, EndLat, EndLon, 'N');
DispDistTextBox.Text = decimal.Round(Convert.ToDecimal(Distance), 2, MidpointRounding.AwayFromZero).ToString();
TrueBrg = LatLongCalc.Bearing(StartLat, StartLon, EndLat, EndLon);
DispBrgTextBox.Text = decimal.Round(Convert.ToDecimal(TrueBrg), 2, MidpointRounding.AwayFromZero).ToString();
}
private void UpdateStats()
{
if ((CenterLat != -1) && (CenterLon != -1))
{
if ((StartLat != -1) && (StartLon != -1))
{
StartBrg = LatLongCalc.Bearing(CenterLat, CenterLon, StartLat, StartLon);
if (StartBrg == 0)
{
StartBrg = 360;
}
StartRadialNUD.Value = Convert.ToInt32(StartBrg);
ArcRadius = LatLongCalc.Distance(CenterLat, CenterLon, StartLat, StartLon);
CalcDistanceTextBox.Text = ArcRadius.ToString("F3");
}
else
{
ArcRadius = -1;
StartBrg = -1;
StartRadialNUD.Value = 1;
CalcDistanceTextBox.Text = string.Empty;
}
if ((EndLat != -1) && (EndLon != -1))
{
EndBrg = LatLongCalc.Bearing(CenterLat, CenterLon, EndLat, EndLon);
if (EndBrg == 0)
{
EndBrg = 360;
}
EndRadialNUD.Value = Convert.ToInt32(EndBrg);
EndDistTextBox.Text = LatLongCalc.Distance(CenterLat, CenterLon, EndLat, EndLon).ToString("F3");
if (ArcRadius != -1)
{
ChordStats();
}
}
else
{
EndBrg = -1;
EndRadialNUD.Value = 1;
EndDistTextBox.Text = string.Empty;
}
}
else
{
ArcRadius = EndBrg = StartBrg - 1;
}
CheckArcButton();
}
private void CenterFromChord()
{
// The center is perpendicular to the midpoint of the start/end chord
// Since I'm always turning to the right, perpendicular is always +90
double Lat0 = (StartLat + EndLat) / 2.0;
double Lon0 = (StartLon + EndLon) / 2.0;
double Brg = (LatLongCalc.Bearing(StartLat, StartLon, EndLat, EndLon) + 90) % 360;
double[] Coords = LatLongCalc.Destination(Lat0, Lon0, RadiusFromChordArc(), Brg, 'N');
CenterLat = Coords[0]; CenterLon = Coords[1];
CenterLatitudeTextBox.Text = Conversions.Degrees2SCT(CenterLat, true);
CenterLongitudeTextBox.Text = Conversions.Degrees2SCT(CenterLon, false);
CenterFixTextBox.Text = "<calculated from chord>";
StartBrg = (LatLongCalc.Bearing(CenterLat, CenterLon, StartLat, StartLon) + 90) % 360;
StartRadialNUD.Value = (int)StartBrg;
EndBrg = (LatLongCalc.Bearing(CenterLat, CenterLon, EndLat, EndLon) + 90) % 360;
EndRadialNUD.Value = (int)EndBrg;
}
