public async Task CalculateForce(int bodyIndex, int maxGravityContributors = 9)
{
try
{
// calculate force
Force netForce = new Force();
for (int j = 0; j < maxGravityContributors; j++)
{
if (bodyIndex != j)
{
netForce += Gravity.InteractionForce(Bodies[bodyIndex], Bodies[j]);
}
}
netForces[bodyIndex] = netForce;
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
public async Task Orbital_Simulation(int numberOfAsteroids = 100, int maxGravityContributors = 9)
{
Bodies = GetCelestialBodies(numberOfAsteroids);
if (maxGravityContributors > Bodies.Count)
{
maxGravityContributors = Bodies.Count;
}
while (!end)
{
try
{
netForces.Clear();
// calculate the force acting on each body
for (int i = 0; i < Bodies.Count; i++)
{
Force netForce = new Force();
for (int j = 0; j < maxGravityContributors; j++)
{
if (i == j)
{
continue;
}
netForce += Gravity.InteractionForce(Bodies[i], Bodies[j]);
}
netForces.Add(netForce);
}
// now positions can update based on net forces
for (int i = 0; i < Bodies.Count; i++)
{
Bodies[i].Iterate(timeStep, netForces[i]);
}
}
catch (Exception ex) { MessageBox.Show(ex.Message); }
}
}
public static List <CelestialBody> GetCelestialBodies(int numberOfAsteroids = 0)
{
List <CelestialBody> bodies = new List <CelestialBody>();
Random RNG = new Random();
double seedAngle = 2.0 * Math.PI * RNG.NextDouble();
double mass, periapsis, apoapsis;
// Sun
mass = 1.9891E30;
periapsis = 0.0;
apoapsis = 0.0;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Mercury
mass = 3.285E23;
periapsis = 46001200000.0;
apoapsis = 69816900000.0;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Venus
mass = 4.8675E24;
periapsis = 107477000000;
apoapsis = 108939000000;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Earth
mass = 5.97237E24;
periapsis = 147095000000;
apoapsis = 152100000000;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Mars
mass = 6.4171E23;
periapsis = 206700000000;
apoapsis = 249200000000;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Jupiter
mass = 1.8982E27;
periapsis = 740.52E9;
apoapsis = 816.62E9;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
//// Saturn
//mass = 5.6834E26;
//periapsis = 1.35255E12;
//apoapsis = 1.5145E12;
//seedAngle = 2.0 * Math.PI * RNG.NextDouble();
//bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
//// Uranus
//mass = 8.681E25;
//periapsis = 2.742E12;
//apoapsis = 3.008E12;
//seedAngle = 2.0 * Math.PI * RNG.NextDouble();
//bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
//// Neptune
//mass = 1.02413E26;
//periapsis = 4.46E12;
//apoapsis = 4.54E12;
//seedAngle = 2.0 * Math.PI * RNG.NextDouble();
//bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
// Asteroids
while (numberOfAsteroids-- > 0)
{
mass = 1E-20; // Asteroid mass can be considered negligible for now
periapsis = 4.04E11 + 4.49E10 * Math.Sqrt(-2.0 * Math.Log(RNG.NextDouble())) *
Math.Sin(2.0 * Math.PI * RNG.NextDouble());
apoapsis = periapsis;
seedAngle = 2.0 * Math.PI * RNG.NextDouble();
bodies.Add(new CelestialBody(mass, periapsis, apoapsis, seedAngle));
}
for (int i = 0; i < bodies.Count; i++)
{
for (int j = 0; j < bodies.Count; j++)
{
if (i != j)
{
if ((Gravity.InteractionForce(bodies[i], bodies[j]).Magnitude() / bodies[i].mass).value > 1E-12)
{
bodies[i].interactions.Add(new Gravity(bodies[i], bodies[j]));
}
}
}
}
return(bodies);
}
