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; }