private void CalculateSatelitePosition(SatelliteSimData satellite, double time)
{
double meanAnomaly = satellite.ArgumentOfPeriapsis;
meanAnomaly += (2 * Math.PI) * time / satellite.Periode;
meanAnomaly %= Math.PI * 2;
//Calc aproximated true anomaly
double trueAnomaly = meanAnomaly;
trueAnomaly += 2 * satellite.Eccentricity * Math.Sin(meanAnomaly);
trueAnomaly += 5.0f / 4.0f *
(satellite.Eccentricity * satellite.Eccentricity * Math.Sin(2 * meanAnomaly));
double distance = satellite.SemiMajorAxis;
distance *= (1 - satellite.Eccentricity * satellite.Eccentricity) /
(1 + satellite.Eccentricity * Math.Cos(trueAnomaly));
//Convert polar coordinates to cartesian coordinates
satellite.Position.X = (float)(distance * Math.Sin(trueAnomaly));
satellite.Position.Y = 0;
satellite.Position.Z = (float)(distance * Math.Cos(trueAnomaly));
//Rotation for inclination and longitude of the acending node
satellite.Position = Vector3.Transform(
Matrix3.CreateRotationX(satellite.Inclenation) *
Matrix3.CreateRotationY(satellite.LongitudeOfAscendingNode), satellite.Position);
//Scale to the universe size
satellite.Position = Vector3.Transform(Matrix3.CreateScale((float)gameData.SimulationData.SimulationSizeScalar),
satellite.Position);
}
//
// simulation stuff
//
private void InitSimulationData(SimData simData)
{
simData.CurrentEarthRotation = 0;
simData.SimulationSpeed = 1000.0f;
simData.SimulationSizeScalar = 0.001f;
var satelites = new List <SatelliteSimData>();
var satDataStream = Utils.OpenEmbeddedResource("vissatellite.simdata.UCS_Satellite_Database_9-1-2017.txt");
var streamReader = new System.IO.StreamReader(satDataStream);
streamReader.ReadLine();
string line;
var rand = new Random();
while ((line = streamReader.ReadLine()) != null)
{
string[] elements = line.Split('\t');
var satelite = new SatelliteSimData();
satelite.IsVisible = true;
satelite.IsSelected = false;
satelite.Name = elements[0];
switch (elements[4])
{
case "Civil":
satelite.Users = SatelliteUsers.CIVIL;
break;
case "Military":
satelite.Users = SatelliteUsers.MILITARY;
break;
case "Government":
satelite.Users = SatelliteUsers.GOVERNMENT;
break;
case "Commercial":
satelite.Users = SatelliteUsers.COMMERCIAL;
break;
default:
satelite.Users = SatelliteUsers.MIXED;
break;
}
switch (elements[7])
{
case "LEO":
satelite.ClassOfOrbit = OrbitType.LEO;
break;
case "MEO":
satelite.ClassOfOrbit = OrbitType.MEO;
break;
case "GEO":
satelite.ClassOfOrbit = OrbitType.GEO;
break;
case "Elliptical":
satelite.ClassOfOrbit = OrbitType.ELLIPTICAL;
break;
}
//Read all the data we have
if (!elements[9].Equals(""))
{
satelite.LongitudeOfGeo = float.Parse(elements[9], CultureInfo.InvariantCulture);
}
satelite.Perigee = float.Parse(elements[10].Replace("\"", "").Replace(",", ""));
satelite.Apogee = float.Parse(elements[11].Replace("\"", "").Replace(",", ""));
satelite.Eccentricity = float.Parse(elements[12], CultureInfo.InvariantCulture);
satelite.Inclenation = float.Parse(elements[13], CultureInfo.InvariantCulture) * (float)Math.PI / 180;
satelite.Periode = float.Parse(elements[14].Replace("\"", ""), CultureInfo.InvariantCulture) * 60;
//Calculated what we need
satelite.SemiMajorAxis = (float)(satelite.Apogee + satelite.Perigee + simData.RealEarthDiameter) / 2;
//Generate random values for needed object elements that are not in the dataset
satelite.LongitudeOfAscendingNode = (float)(rand.NextDouble() * Math.PI * 2);
satelite.ArgumentOfPeriapsis = (float)(rand.NextDouble() * Math.PI * 2);
satelite.Position = new Vector3(0, 0, 0);
satelites.Add(satelite);
}
simData.Satellites = satelites.ToArray();
}
private ImageAssetData GetSatteliteTexture(SatelliteSimData satellite)
{
ImageAssetData texture = null;
switch (this.gameData.ColorCodeMode)
{
case ColorCodeMode.NONE:
texture = this.gameData.SatelliteTextureDefault;
break;
case ColorCodeMode.USERS:
switch (satellite.Users)
{
case SatelliteUsers.CIVIL:
texture = this.gameData.SatelliteTextures[1];
break;
case SatelliteUsers.MILITARY:
texture = this.gameData.SatelliteTextures[2];
break;
case SatelliteUsers.COMMERCIAL:
texture = this.gameData.SatelliteTextures[3];
break;
case SatelliteUsers.GOVERNMENT:
texture = this.gameData.SatelliteTextures[4];
break;
case SatelliteUsers.MIXED:
texture = this.gameData.SatelliteTextures[5];
break;
}
break;
case ColorCodeMode.ORBITTYPE:
switch (satellite.ClassOfOrbit)
{
case OrbitType.LEO:
texture = this.gameData.SatelliteTextures[1];
break;
case OrbitType.MEO:
texture = this.gameData.SatelliteTextures[2];
break;
case OrbitType.GEO:
texture = this.gameData.SatelliteTextures[3];
break;
case OrbitType.ELLIPTICAL:
texture = this.gameData.SatelliteTextures[4];
break;
}
break;
}
if (satellite.IsSelected)
{
texture = this.gameData.SatelliteTextureSelected;
}
return(texture);
}
