public void Move()
{
// Use Current Acceleration to Update Veclocity
double[] _oldVel = Velocity;
Velocity = LinearAlgebra.VectorAdd(_oldVel, Acceleration);
// Use Current Velocity to Update Position
double[] _oldPos = Position;
Position = LinearAlgebra.VectorAdd(_oldPos, Velocity);
}
public static double[] ComputeAcceleration(Body A, Body B)
{
// Compute Acceleration of Body A due to Body B
double G = 6.67e-11;
double k = G * B.mass;
double[] _dr = LinearAlgebra.VectorSubtract(A.Position, B.Position);
double[] _r = LinearAlgebra.VectorMultiply(
LinearAlgebra.VectorAbs(_dr), LinearAlgebra.VectorExp(_dr, -3));
return(LinearAlgebra.VectorScale(_r, k));
}
private double[] CenterOfMass()
{
// Compute [x,y,z] Center of Mass of System
double _totalMass = TotalMass();
double[] _centerOfMass = new double[] { 0.0, 0.0, 0.0 };
for (int i = 0; i < 3; i++)
{
// Each of the three components, [x,y,z]
for (int j = 0; j < bodies.Count; j++)
{
// Go through each body
_centerOfMass[i] += bodies[j].mass * bodies[j].Position[i];
}
}
_centerOfMass = LinearAlgebra.VectorScale(_centerOfMass, 1.0 / _totalMass);
return(_centerOfMass);
}
private void ComputeAccelerations()
{
// Clear all acceleration vectors for step
for (int i = 0; i < nBodies; i++)
{
bodies[i].Acceleration = new double[] { 0.0, 0.0, 0.0, }
}
;
// Compute Acceleration vectors action on each body
for (int i = 0; i < nBodies; i++)
{
for (int j = 0; j < nBodies; j++)
{
if (i == j)
{
continue;
} // Skip if body is the same
double[] _oldAcl = bodies[i].Acceleration;
double[] _newAcl = Physics.ComputeAcceleration(bodies[i], bodies[j]);
bodies[i].Acceleration = LinearAlgebra.VectorAdd(_oldAcl, _newAcl);
}
}
}
