public IEnumerable <StarSystemBuilder> Generate(Random rng, SystemEvaluator evaluator, StarPositions starPositions)
{
var namer = new StarNamer(starPositions.Stars.Count, new Random());
var uninhabitedStars = starPositions.Stars.Where((x, i) => !starPositions.HomeSystems.Contains(i));
var homeStars = new HashSet <Vector2D>(starPositions.HomeSystems.Select(i => starPositions.Stars[i]));
var potentials = new Dictionary <Vector2D, double>();
var starts = new Dictionary <Vector2D, double>();
var climate = this.climateLevels[this.climateParameter.Value];
var potential = this.potentialLevels[this.potentialParameter.Value];
foreach (var home in homeStars)
{
potentials[home] = potential.HomesystemPotentialScore;
starts[home] = Math.Min(climate.HomesystemStartScore, potentials[home]);
}
var undistributed = new HashSet <Vector2D>(uninhabitedStars);
var weightSum = potential.Ranges.Sum(x => x.Weight);
foreach (var range in potential.Ranges)
{
var count = (int)Math.Round(range.Weight * undistributed.Count() / weightSum);
foreach (var star in spreadPoints(rng, undistributed, count))
{
potentials[star] = Methods.Lerp(rng.NextDouble(), range.Min, range.Max);
undistributed.Remove(star);
}
weightSum -= range.Weight;
}
undistributed = new HashSet <Vector2D>(uninhabitedStars);
weightSum = climate.Ranges.Sum(x => x.Weight);
foreach (var range in climate.Ranges)
{
var undistributedCandidates = new HashSet <Vector2D>(undistributed.Where(x => potentials[x] >= range.Min));
var count = Math.Min(
(int)Math.Round(range.Weight * undistributed.Count / weightSum),
undistributedCandidates.Count
);
foreach (var star in spreadPoints(rng, undistributedCandidates, count))
{
starts[star] = Methods.Lerp(rng.NextDouble(), range.Min, range.Max);
undistributed.Remove(star);
}
weightSum -= range.Weight;
}
//TODO(v0.8): Star size and trait distribution
foreach (var position in starPositions.Stars)
{
yield return(generateSystem(namer, position, rng, evaluator, starts[position], potentials[position], homeStars.Contains(position)));
}
}
private StarSystemBuilder generateSystem(StarNamer namer, Vector2D position, Random rng, SystemEvaluator evaluator, double startingScore, double potentialScore, bool isHomeSystem)
{
var starType = isHomeSystem ? this.homeStarType : starTypes[rng.Next(starTypes.Length)];
var starName = namer.NextName();
var fixedParts = new StarSystemBuilder(
starType.Hue,
(float)Methods.Lerp(rng.NextDouble(), starType.MinScale, starType.Maxscale),
starName, position,
new List <StarTraitType>(starType.Traits.Select(x => this.starTraits[x]))
);
var usedPositions = new HashSet <int>();
if (isHomeSystem)
{
fixedParts.AddPlanet(this.homeworldPosition, PlanetType.Rock, this.homeworldSize, this.homeworldTraits.Select(x => this.planetTraits[x]));
usedPositions.Add(this.homeworldPosition);
}
var systems = new List <StarSystemBuilder>();
for (int i = 0; i < SysGenRepeats; i++)
{
var system = new StarSystemBuilder(fixedParts);
systems.Add(system);
var planets = rng.Next(5);
var bodyPosition = 1;
for (int p = 0; p < planets; p++)
{
var type = bodyTypes()[rng.Next(3)];
var size = Math.Round(Methods.Lerp(rng.NextDouble(), 50, 200));
while (usedPositions.Contains(bodyPosition))
{
bodyPosition++;
}
system.AddPlanet(bodyPosition, type, size, randomTraits(rng, type, size));
bodyPosition++;
}
}
return(Methods.FindWorst(systems, x => Methods.MeanSquareError(
evaluator.StartingScore(x) - startingScore,
evaluator.PotentialScore(x) - potentialScore
)));
}
public IEnumerable <StarSystem> Generate(Random rng, StarPositions starPositions, IEnumerable <BodyTraitType> planetTraits)
{
int colorI = 0;
var namer = new StarNamer(starPositions.Stars.Length);
//UNDONE(later): Picks star types cyclicaly
//TODO(later): Randomize star type distribution
//TODO(later): Star size and radiation distribution
foreach (var position in starPositions.Stars)
{
var star = new StarData(starTypes[colorI++ % starTypes.Length].Hue, 1, namer.NextName(), position, new List <BodyTraitType>());
yield return(new StarSystem(
star,
new Planet[] {
new Planet(star, 1, PlanetType.Rock, 100, planetTraits.Take(1).ToList()),
new Planet(star, 2, PlanetType.Asteriod, 100, new List <BodyTraitType>()),
new Planet(star, 3, PlanetType.GasGiant, 100, new List <BodyTraitType>()),
}));
}
}
