public NBodySystem()
{
_bodies = new Body[] {
new Body() // Sun
{
mass = Solarmass,
},
new Body() // Jupiter
{
x = 4.84143144246472090e+00,
y = -1.16032004402742839e+00,
z = -1.03622044471123109e-01,
vx = 1.66007664274403694e-03 * DaysPeryear,
vy = 7.69901118419740425e-03 * DaysPeryear,
vz = -6.90460016972063023e-05 * DaysPeryear,
mass = 9.54791938424326609e-04 * Solarmass,
},
new Body() // Saturn
{
x = 8.34336671824457987e+00,
y = 4.12479856412430479e+00,
z = -4.03523417114321381e-01,
vx = -2.76742510726862411e-03 * DaysPeryear,
vy = 4.99852801234917238e-03 * DaysPeryear,
vz = 2.30417297573763929e-05 * DaysPeryear,
mass = 2.85885980666130812e-04 * Solarmass,
},
new Body() // Uranus
{
x = 1.28943695621391310e+01,
y = -1.51111514016986312e+01,
z = -2.23307578892655734e-01,
vx = 2.96460137564761618e-03 * DaysPeryear,
vy = 2.37847173959480950e-03 * DaysPeryear,
vz = -2.96589568540237556e-05 * DaysPeryear,
mass = 4.36624404335156298e-05 * Solarmass,
},
new Body() // Neptune
{
x = 1.53796971148509165e+01,
y = -2.59193146099879641e+01,
z = 1.79258772950371181e-01,
vx = 2.68067772490389322e-03 * DaysPeryear,
vy = 1.62824170038242295e-03 * DaysPeryear,
vz = -9.51592254519715870e-05 * DaysPeryear,
mass = 5.15138902046611451e-05 * Solarmass,
},
};
_pairs = new Pair[_bodies.Length * (_bodies.Length - 1) / 2];
int pi = 0;
for (int i = 0; i < _bodies.Length - 1; i++)
{
for (int j = i + 1; j < _bodies.Length; j++)
{
_pairs[pi++] = new Pair()
{
bi = _bodies[i], bj = _bodies[j]
}
}
}
;
double px = 0.0, py = 0.0, pz = 0.0;
foreach (var b in _bodies)
{
px += b.vx * b.mass; py += b.vy * b.mass; pz += b.vz * b.mass;
}
var sol = _bodies[0];
sol.vx = -px / Solarmass; sol.vy = -py / Solarmass; sol.vz = -pz / Solarmass;
}
public NBodySystem()
{
_bodies = new Body[] {
new Body() { // Sun
mass = Solarmass,
},
new Body() { // Jupiter
x = 4.84143144246472090e+00,
y = -1.16032004402742839e+00,
z = -1.03622044471123109e-01,
vx = 1.66007664274403694e-03 * DaysPeryear,
vy = 7.69901118419740425e-03 * DaysPeryear,
vz = -6.90460016972063023e-05 * DaysPeryear,
mass = 9.54791938424326609e-04 * Solarmass,
},
new Body() { // Saturn
x = 8.34336671824457987e+00,
y = 4.12479856412430479e+00,
z = -4.03523417114321381e-01,
vx = -2.76742510726862411e-03 * DaysPeryear,
vy = 4.99852801234917238e-03 * DaysPeryear,
vz = 2.30417297573763929e-05 * DaysPeryear,
mass = 2.85885980666130812e-04 * Solarmass,
},
new Body() { // Uranus
x = 1.28943695621391310e+01,
y = -1.51111514016986312e+01,
z = -2.23307578892655734e-01,
vx = 2.96460137564761618e-03 * DaysPeryear,
vy = 2.37847173959480950e-03 * DaysPeryear,
vz = -2.96589568540237556e-05 * DaysPeryear,
mass = 4.36624404335156298e-05 * Solarmass,
},
new Body() { // Neptune
x = 1.53796971148509165e+01,
y = -2.59193146099879641e+01,
z = 1.79258772950371181e-01,
vx = 2.68067772490389322e-03 * DaysPeryear,
vy = 1.62824170038242295e-03 * DaysPeryear,
vz = -9.51592254519715870e-05 * DaysPeryear,
mass = 5.15138902046611451e-05 * Solarmass,
},
};
_pairs = new Pair[_bodies.Length * (_bodies.Length - 1) / 2];
int pi = 0;
for (int i = 0; i < _bodies.Length - 1; i++)
for (int j = i + 1; j < _bodies.Length; j++)
_pairs[pi++] = new Pair() { bi = _bodies[i], bj = _bodies[j] };
double px = 0.0, py = 0.0, pz = 0.0;
foreach (var b in _bodies)
{
px += b.vx * b.mass; py += b.vy * b.mass; pz += b.vz * b.mass;
}
var sol = _bodies[0];
sol.vx = -px / Solarmass; sol.vy = -py / Solarmass; sol.vz = -pz / Solarmass;
}