public static double CalculateHohmannTransferDeltaV(SimpleOrbit orbit1, SimpleOrbit orbit2)
{
SimpleOrbit fastestPeriapsisOrbit, slowestPeriapsisOrbit, transferOrbit;
double deltaV = 0.0;
if (orbit1.ParentBody != orbit2.ParentBody)
{
throw new ArgumentException("Input orbits must have same parent body.");
}
if (orbit1.PeriapsisSpeed > orbit2.PeriapsisSpeed)
{
fastestPeriapsisOrbit = orbit1;
slowestPeriapsisOrbit = orbit2;
}
else
{
fastestPeriapsisOrbit = orbit2;
slowestPeriapsisOrbit = orbit1;
}
SimpleOrbitBuilder transferOrbitBuilder = new SimpleOrbitBuilder(orbit1.ParentBody);
transferOrbitBuilder.SetPeriapsis(fastestPeriapsisOrbit.Periapsis);
transferOrbitBuilder.SetApoapsis(slowestPeriapsisOrbit.Periapsis);
transferOrbit = transferOrbitBuilder.Build();
deltaV += Math.Abs(transferOrbit.PeriapsisSpeed - fastestPeriapsisOrbit.PeriapsisSpeed);
deltaV += Math.Abs(slowestPeriapsisOrbit.PeriapsisSpeed - transferOrbit.ApoapsisSpeed);
return(deltaV);
}
/// <summary>
/// Will set the GUI text fields based on the input orbit.
/// </summary>
/// <param name="orbit">An orbit that was calculated.</param>
private void ParseOrbit(SimpleOrbit orbit)
{
if (!lockApoapsis)
{
apoapsisText = useAltitideAspides ? orbit.ApoapsisAltitude.ToString() : orbit.Apoapsis.ToString();
}
if (!lockPeriapsis)
{
periapsisText = useAltitideAspides ? orbit.PeriapsisAltitude.ToString() : orbit.Periapsis.ToString();
}
if (!lockEccentricity)
{
eccentricityText = orbit.Eccentricity.ToString();
}
if (!lockSMA)
{
smaText = orbit.SemiMajorAxis.ToString();
}
if (!lockPeriod)
{
periodText = orbit.OrbitalPeriod.ToString();
}
}
private void RenderHohmannTransferArea()
{
// The Orbit 1 Save button.
GUILayout.BeginHorizontal();
if (currentOrbit == null)
{
GUI.enabled = false;
}
if (GUILayout.Button("Save as Orbit 1", GUILayout.Width(SaveOrbitButtonWidth)))
{
savedOrbit1 = currentOrbit;
}
GUI.enabled = true;
if (savedOrbit1 != null)
{
if (GUILayout.Button("C", GUILayout.Width(CharButtonWidth)))
{
savedOrbit1 = null;
}
GUILayout.Label(savedOrbit1.ToString(useAltitideAspides));
}
GUILayout.EndHorizontal();
// The Orbit 2 Save button.
GUILayout.BeginHorizontal();
if (currentOrbit == null)
{
GUI.enabled = false;
}
if (GUILayout.Button("Save as Orbit 2", GUILayout.Width(SaveOrbitButtonWidth)))
{
savedOrbit2 = currentOrbit;
}
GUI.enabled = true;
if (savedOrbit2 != null)
{
if (GUILayout.Button("C", GUILayout.Width(CharButtonWidth)))
{
savedOrbit2 = null;
}
GUILayout.Label(savedOrbit2.ToString(useAltitideAspides));
}
GUILayout.EndHorizontal();
// Calculate the delta-V of transfer if valid.
if (savedOrbit1 != null && savedOrbit2 != null)
{
if (savedOrbit1.ParentBody == savedOrbit2.ParentBody)
{
try
{
double hohmannTransferDeltaV = SimpleOrbit.CalculateHohmannTransferDeltaV(savedOrbit1, savedOrbit2);
GUILayout.Label("Transfer Δv: " + SOCUtilis.ParseOrbitElement(hohmannTransferDeltaV, SimpleOrbit.ScalerType.Speed));
}
catch (ArgumentException e)
{
GUILayout.Label("Error: " + e.Message);
}
}
else
{
GUILayout.Label("Parent bodies of saved orbits do not match.");
}
}
}
