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Simple.cs
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Simple.cs
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using System;
using AssertExtensions;
using MechJebLib.Primitives;
using Xunit;
using static System.Math;
using static MechJebLib.Utils.Statics;
namespace MechJebLibTest.Maneuvers
{
public class Simple
{
[Fact]
public void DeltaVToCircularizeTest()
{
const int NTRIALS = 50;
var random = new Random();
for (int i = 0; i < NTRIALS; i++)
{
var r = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
var v = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
double rscale = random.NextDouble() * 1.5e8 + 1;
double vscale = random.NextDouble() * 3e4 + 1;
r *= rscale;
v *= vscale;
double mu = rscale * vscale * vscale;
V3 dv = MechJebLib.Maneuvers.Simple.DeltaVToCircularize(mu, r, v);
MechJebLib.Core.Maths.EccFromStateVectors(mu, r, v + dv).ShouldEqual(0, 1e-15);
MechJebLib.Core.Maths.PeriapsisFromStateVectors(mu, r, v + dv).ShouldEqual(r.magnitude, 1e-7);
MechJebLib.Core.Maths.ApoapsisFromStateVectors(mu, r, v + dv).ShouldEqual(r.magnitude, 1e-7);
}
}
[Fact]
public void DeltaVToEllipticizeTest()
{
const int NTRIALS = 50;
var random = new Random();
for (int i = 0; i < NTRIALS; i++)
{
var r = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
var v = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
double newPeR = random.NextDouble() * r.magnitude;
double newApR = random.NextDouble() * 1e9 + r.magnitude;
double rscale = random.NextDouble() * 1.5e8 + 1;
double vscale = random.NextDouble() * 3e4 + 1;
r *= rscale;
v *= vscale;
newPeR *= rscale;
newApR *= rscale;
double mu = rscale * vscale * vscale;
V3 dv = MechJebLib.Maneuvers.Simple.DeltaVToEllipticize(mu, r, v, newPeR, newApR);
MechJebLib.Core.Maths.PeriapsisFromStateVectors(mu, r, v + dv).ShouldEqual(newPeR, 1e-4);
MechJebLib.Core.Maths.ApoapsisFromStateVectors(mu, r, v + dv).ShouldEqual(newApR, 1e-4);
}
}
[Fact]
public void DeltaVToChangeInclinationTest()
{
const int NTRIALS = 50;
var random = new Random();
for (int i = 0; i < NTRIALS; i++)
{
var r = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
var v = new V3(4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2, 4 * random.NextDouble() - 2);
double rscale = random.NextDouble() * 1.5e8 + 1;
double vscale = random.NextDouble() * 3e4 + 1;
r *= rscale;
v *= vscale;
double plusOrMinusOne = random.Next(0, 2) * 2 - 1;
double lat = MechJebLib.Core.Maths.LatitudeFromBCI(r);
double newInc = Abs(lat) + random.NextDouble() * (PI - 2 * Abs(lat));
newInc *= plusOrMinusOne;
V3 dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeInclination(r, v, newInc);
MechJebLib.Core.Maths.IncFromStateVectors(r, v + dv).ShouldEqual(Abs(newInc), 1e-4);
}
}
[Fact]
public void DeltaVToChangeInclinationTest1()
{
const double mu = 3.986004418e+14;
const double rearth = 6.371e+6;
const double r185 = rearth + 185e+3;
double v185 = MechJebLib.Core.Maths.CircularVelocity(mu, r185);
var r0 = new V3(r185, 0, 0);
var v0 = new V3(0, v185, 0);
V3 dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeInclination(r0, v0, 0);
Assert.Equal(V3.zero, dv);
dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeInclination(r0, v0, Deg2Rad(90));
Assert.Equal(0, (v0 + dv).x, 9);
Assert.Equal(0, (v0 + dv).y, 9);
Assert.Equal(v185, (v0 + dv).z, 9);
}
[Fact]
public void DeltaVToChangeFPATest1()
{
const double mu = 3.986004418e+14;
const double rearth = 6.371e+6;
const double r185 = rearth + 185e+3;
double v185 = MechJebLib.Core.Maths.CircularVelocity(mu, r185);
var r0 = new V3(r185, 0, 0);
var v0 = new V3(0, v185, 0);
V3 dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeFPA(r0, v0, 0);
Assert.Equal(V3.zero, dv);
dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeFPA(r0, v0, Deg2Rad(90));
Assert.Equal(v185, dv.x, 9);
Assert.Equal(-v185, dv.y, 9);
Assert.Equal(0, dv.z, 9);
dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeFPA(r0, v0, Deg2Rad(-90));
Assert.Equal(-v185, dv.x, 9);
Assert.Equal(-v185, dv.y, 9);
Assert.Equal(0, dv.z, 9);
r0 = new V3(r185, 0, 0);
v0 = new V3(v185 / Sqrt(2), v185 / Sqrt(2), 0);
dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeFPA(r0, v0, 0);
Assert.Equal(-v185 / Sqrt(2), dv.x, 9);
Assert.Equal(v185 - v185 / Sqrt(2), dv.y, 9);
Assert.Equal(0, dv.z, 9);
r0 = new V3(r185, 0, 0);
v0 = new V3(v185 / Sqrt(2), 0, v185 / Sqrt(2));
dv = MechJebLib.Maneuvers.Simple.DeltaVToChangeFPA(r0, v0, 0);
Assert.Equal(-v185 / Sqrt(2), dv.x, 9);
Assert.Equal(0, dv.y, 9);
Assert.Equal(v185 - v185 / Sqrt(2), dv.z, 9);
}
}
}