/// <summary>
/// Using the inverse square law, with respect to gravity;
/// This calculates the intensity of gravity at the surface of the Celesital Object using
/// (G * M) / (R^2)
/// where:
/// G is the universal constant of Gravity;
/// M is the mass of the Celestial Object;
/// R is the radius of the Celestial Object;
/// </summary>
private void CalculateIntensityOfGravityAtSurface()
{
//Convert from Solar Mass to kg, if nessecary
ExponentionalValues mass = CheckMassUnits();
/// The gravitational constant of the universe: 6.674 x 10^-11 N *(m^2)/(kg^2)
/// (Newton sqaure meters per kilogram squared)
ExponentionalValues constantOfGravity = new ExponentionalValues(6.674f, -11, SIUnit.NewtonMetersSquaredPerKGSquared);
//Multiply the mass by universal constant of gravity (G*M)
ExponentionalValues GravityMassProduct = new ExponentionalValues(
constantOfGravity.value * mass.value,
constantOfGravity.exponent + mass.exponent,
SIUnit.cubicMetersPerSecSquaredPerKG);
//Evaluate: (radius)^2
//Convert from Kilometers to Meters, if nessecary
ExponentionalValues radius = CheckRadiusUnits();
radius.units = SIUnit.metersSquared;
radius.Squared();
//Evaluate: GravityMassProduct / radius
ExponentionalValues _surfaceGravity = new ExponentionalValues(
(GravityMassProduct.value / radius.value),
(GravityMassProduct.exponent - radius.exponent),
SIUnit.metersPerSecSquared
);
//Acceleration of gravity at the surface in m/s^2
_surfaceGravity.Normalize();
SurfaceGravity = _surfaceGravity;
}
public AstronomicalObject(string name, ExponentionalValues mass, ExponentionalValues radius)
{
Name = name;
Mass = mass;
Radius = radius;
CalculateIntensityOfGravityAtSurface();
}
/// <summary>
/// Convert from Kilometers to Meters
/// </summary>
/// <param name="radiusInKM"></param>
/// <returns></returns>
public static ExponentionalValues KilometersToMeters(ExponentionalValues radiusInKM)
{
float meters = radiusInKM.value * 1000;
int exponents = radiusInKM.exponent;
return(new ExponentionalValues(meters, exponents, SIUnit.m));
}
/// <summary>
/// Convert from Solar Mass to Kilograms
/// </summary>
/// <param name="massInSM"></param>
/// <returns></returns>
public static ExponentionalValues SolarMassToKG(ExponentionalValues massInSM)
{
float kg = massInSM.value * _solarToKG;
int exponents = massInSM.exponent + 30;
return(new ExponentionalValues(kg, exponents, SIUnit.kg));
}
public AstronomicalObject(string[] values)
{
Name = values[0];
Mass = new ExponentionalValues(
float.Parse(values[1]),
int.Parse(values[2]),
SIUnitConverter.StringToSIUnit(values[3])
);
Radius = new ExponentionalValues(
float.Parse(values[4]),
int.Parse(values[5]),
SIUnitConverter.StringToSIUnit(values[6])
);
CalculateIntensityOfGravityAtSurface();
}
/// <summary>
/// Display the corresponding information in the corresponding fields
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void loadedObjectsCombo_SelectedIndexChanged(object sender, EventArgs e)
{
//Get the selected Astronomical Object
_SelectedAstronomicalObject = _AstronomicalObjectData[loadedObjectsCombo.SelectedIndex];
nameTextBox.Text = _SelectedAstronomicalObject.Name;
//Mass
ExponentionalValues mass = _SelectedAstronomicalObject.Mass;
massTextBox.Text = mass.value.ToString();
massExponentTextBox.Text = mass.exponent.ToString();
massUnitsCombo.SelectedItem = (mass.units.Equals(SIUnit.kg)) ? "kilograms" : "Solar Masses";
//Radius
ExponentionalValues radius = _SelectedAstronomicalObject.Radius;
radiusTextBox.Text = radius.value.ToString();
radiusExponentTextBox.Text = radius.exponent.ToString();
radiusUnitsCombo.SelectedItem = (radius.units.Equals(SIUnit.m)) ? "meters" : "kilometers";
gravityOutputTextBox.Text = _SelectedAstronomicalObject.SurfaceGravityToString();
DisplayDistance(distanceTrackBar.Value);
}
