321 lines
13 KiB
C#
321 lines
13 KiB
C#
using static SpaceGame.Api.Universe.Scenario.LoaderSupport;
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namespace SpaceGame.Api.Universe.Scenario;
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public sealed class SpatialBuilder(IBalanceService balance)
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{
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internal ScenarioSpatialLayout BuildLayout(IReadOnlyList<SystemRuntime> systems)
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{
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var systemGraphs = systems.ToDictionary(
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system => system.Definition.Id,
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BuildSystemSpatialGraph,
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StringComparer.Ordinal);
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var celestials = systemGraphs.Values.SelectMany(graph => graph.Celestials).ToList();
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var nodes = new List<ResourceNodeRuntime>();
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var nodeIdCounter = 0;
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foreach (var system in systems)
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{
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var systemGraph = systemGraphs[system.Definition.Id];
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foreach (var node in system.Definition.ResourceNodes)
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{
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var anchorCelestial = ResolveResourceNodeAnchor(systemGraph, node);
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nodes.Add(new ResourceNodeRuntime
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{
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Id = $"node-{++nodeIdCounter}",
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SystemId = system.Definition.Id,
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Position = ComputeResourceNodePosition(anchorCelestial, node, balance.YPlane),
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SourceKind = node.SourceKind,
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ItemId = node.ItemId,
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CelestialId = anchorCelestial?.Id,
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OrbitRadius = node.RadiusOffset,
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OrbitPhase = node.Angle,
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OrbitInclination = DegreesToRadians(node.InclinationDegrees),
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OreRemaining = node.OreAmount,
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MaxOre = node.OreAmount,
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});
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}
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}
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return new ScenarioSpatialLayout(systemGraphs, celestials, nodes);
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}
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private static SystemSpatialGraph BuildSystemSpatialGraph(SystemRuntime system)
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{
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var celestials = new List<CelestialRuntime>();
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var lagrangeNodesByPlanetIndex = new Dictionary<int, Dictionary<string, CelestialRuntime>>();
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for (var starIndex = 0; starIndex < system.Definition.Stars.Count; starIndex += 1)
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{
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AddCelestial(
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celestials,
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id: $"node-{system.Definition.Id}-star-{starIndex + 1}",
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systemId: system.Definition.Id,
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kind: SpatialNodeKind.Star,
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position: Vector3.Zero,
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localSpaceRadius: LocalSpaceRadius);
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}
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var primaryStarNodeId = $"node-{system.Definition.Id}-star-1";
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for (var planetIndex = 0; planetIndex < system.Definition.Planets.Count; planetIndex += 1)
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{
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var planet = system.Definition.Planets[planetIndex];
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var planetNodeId = $"node-{system.Definition.Id}-planet-{planetIndex + 1}";
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var planetPosition = ComputePlanetPosition(planet);
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var planetCelestial = AddCelestial(
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celestials,
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id: planetNodeId,
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systemId: system.Definition.Id,
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kind: SpatialNodeKind.Planet,
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position: planetPosition,
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localSpaceRadius: LocalSpaceRadius,
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parentNodeId: primaryStarNodeId);
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var lagrangeNodes = new Dictionary<string, CelestialRuntime>(StringComparer.Ordinal);
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foreach (var point in EnumeratePlanetLagrangePoints(planetPosition, planet))
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{
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var lagrangeCelestial = AddCelestial(
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celestials,
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id: $"node-{system.Definition.Id}-planet-{planetIndex + 1}-{point.Designation.ToLowerInvariant()}",
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systemId: system.Definition.Id,
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kind: SpatialNodeKind.LagrangePoint,
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position: point.Position,
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localSpaceRadius: LocalSpaceRadius,
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parentNodeId: planetCelestial.Id,
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orbitReferenceId: point.Designation);
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lagrangeNodes[point.Designation] = lagrangeCelestial;
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}
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lagrangeNodesByPlanetIndex[planetIndex] = lagrangeNodes;
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for (var moonIndex = 0; moonIndex < planet.Moons.Count; moonIndex += 1)
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{
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var moon = planet.Moons[moonIndex];
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var moonPosition = ComputeMoonPosition(planetPosition, moon);
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AddCelestial(
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celestials,
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id: $"node-{system.Definition.Id}-planet-{planetIndex + 1}-moon-{moonIndex + 1}",
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systemId: system.Definition.Id,
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kind: SpatialNodeKind.Moon,
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position: moonPosition,
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localSpaceRadius: LocalSpaceRadius,
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parentNodeId: planetCelestial.Id);
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}
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}
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return new SystemSpatialGraph(system.Definition.Id, celestials, lagrangeNodesByPlanetIndex);
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}
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private static CelestialRuntime AddCelestial(
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ICollection<CelestialRuntime> celestials,
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string id,
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string systemId,
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SpatialNodeKind kind,
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Vector3 position,
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float localSpaceRadius,
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string? parentNodeId = null,
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string? orbitReferenceId = null)
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{
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var celestial = new CelestialRuntime
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{
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Id = id,
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SystemId = systemId,
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Kind = kind,
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Position = position,
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LocalSpaceRadius = localSpaceRadius,
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ParentNodeId = parentNodeId,
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OrbitReferenceId = orbitReferenceId,
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};
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celestials.Add(celestial);
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return celestial;
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}
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private static IEnumerable<LagrangePointPlacement> EnumeratePlanetLagrangePoints(Vector3 planetPosition, PlanetDefinition planet)
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{
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var radial = NormalizeOrFallback(planetPosition, new Vector3(1f, 0f, 0f));
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var tangential = new Vector3(-radial.Z, 0f, radial.X);
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var orbitRadiusKm = MathF.Sqrt(planetPosition.X * planetPosition.X + planetPosition.Z * planetPosition.Z);
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var offset = ComputePlanetLocalLagrangeOffset(orbitRadiusKm, planet);
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var triangularAngle = MathF.PI / 3f;
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yield return new LagrangePointPlacement("L1", Add(planetPosition, Scale(radial, -offset)));
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yield return new LagrangePointPlacement("L2", Add(planetPosition, Scale(radial, offset)));
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yield return new LagrangePointPlacement("L3", Scale(radial, -orbitRadiusKm));
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yield return new LagrangePointPlacement(
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"L4",
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Add(
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Scale(radial, orbitRadiusKm * MathF.Cos(triangularAngle)),
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Scale(tangential, orbitRadiusKm * MathF.Sin(triangularAngle))));
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yield return new LagrangePointPlacement(
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"L5",
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Add(
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Scale(radial, orbitRadiusKm * MathF.Cos(triangularAngle)),
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Scale(tangential, -orbitRadiusKm * MathF.Sin(triangularAngle))));
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}
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private static float ComputePlanetLocalLagrangeOffset(float orbitRadiusKm, PlanetDefinition planet)
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{
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var planetMassProxy = EstimatePlanetMassRatio(planet);
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var hillLikeOffset = orbitRadiusKm * MathF.Cbrt(MathF.Max(planetMassProxy / 3f, 1e-9f));
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var minimumOffset = MathF.Max(planet.Size * 4f, 25000f);
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return MathF.Max(minimumOffset, hillLikeOffset);
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}
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private static float EstimatePlanetMassRatio(PlanetDefinition planet)
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{
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var earthRadiusRatio = MathF.Max(planet.Size / 6371f, 0.05f);
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var densityFactor = planet.PlanetType switch
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{
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"gas-giant" => 0.24f,
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"ice-giant" => 0.18f,
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"oceanic" => 0.95f,
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"ice" => 0.7f,
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_ => 1f,
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};
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var earthMasses = MathF.Pow(earthRadiusRatio, 3f) * densityFactor;
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return earthMasses / 332_946f;
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}
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internal static StationPlacement ResolveStationPlacement(
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InitialStationDefinition plan,
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SystemRuntime system,
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SystemSpatialGraph graph,
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IReadOnlyCollection<CelestialRuntime> existingCelestials)
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{
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if (plan.PlanetIndex is int planetIndex &&
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graph.LagrangeNodesByPlanetIndex.TryGetValue(planetIndex, out var lagrangeNodes))
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{
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var designation = ResolveLagrangeDesignation(plan.LagrangeSide);
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if (lagrangeNodes.TryGetValue(designation, out var lagrangeCelestial))
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{
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return new StationPlacement(lagrangeCelestial, lagrangeCelestial.Position);
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}
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}
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if (plan.Position is { Length: 3 })
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{
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var targetPosition = NormalizeScenarioPoint(system, plan.Position);
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var preferredCelestial = existingCelestials
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.Where(c => c.SystemId == system.Definition.Id && c.Kind == SpatialNodeKind.LagrangePoint)
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.OrderBy(c => c.Position.DistanceTo(targetPosition))
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.FirstOrDefault()
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?? existingCelestials
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.Where(c => c.SystemId == system.Definition.Id)
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.OrderBy(c => c.Position.DistanceTo(targetPosition))
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.First();
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return new StationPlacement(preferredCelestial, preferredCelestial.Position);
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}
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var fallbackCelestial = graph.Celestials
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.FirstOrDefault(c => c.Kind == SpatialNodeKind.LagrangePoint && string.IsNullOrEmpty(c.OccupyingStructureId))
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?? graph.Celestials.First(c => c.Kind == SpatialNodeKind.Planet);
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return new StationPlacement(fallbackCelestial, fallbackCelestial.Position);
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}
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private static string ResolveLagrangeDesignation(int? lagrangeSide) => lagrangeSide switch
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{
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< 0 => "L4",
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> 0 => "L5",
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_ => "L1",
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};
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private static CelestialRuntime? ResolveResourceNodeAnchor(SystemSpatialGraph graph, ResourceNodeDefinition definition)
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{
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if (!string.IsNullOrWhiteSpace(definition.AnchorReference))
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{
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var anchorId = definition.AnchorReference.ToLowerInvariant() switch
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{
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var reference when reference.StartsWith("star-", StringComparison.Ordinal)
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=> $"node-{graph.SystemId}-{reference}",
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var reference when reference.StartsWith("planet-", StringComparison.Ordinal)
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=> $"node-{graph.SystemId}-{reference}",
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_ => null,
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};
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if (anchorId is not null)
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{
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return graph.Celestials.FirstOrDefault(c => string.Equals(c.Id, anchorId, StringComparison.Ordinal));
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}
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}
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if (definition.AnchorPlanetIndex is not int planetIndex || planetIndex < 0)
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{
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return null;
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}
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if (definition.AnchorMoonIndex is int moonIndex && moonIndex >= 0)
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{
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var moonNodeId = $"node-{graph.SystemId}-planet-{planetIndex + 1}-moon-{moonIndex + 1}";
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return graph.Celestials.FirstOrDefault(c => c.Id == moonNodeId);
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}
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var planetNodeId = $"node-{graph.SystemId}-planet-{planetIndex + 1}";
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return graph.Celestials.FirstOrDefault(c => c.Id == planetNodeId);
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}
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private static Vector3 ComputeResourceNodePosition(CelestialRuntime? anchorCelestial, ResourceNodeDefinition definition, float yPlane)
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{
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var verticalOffset = MathF.Sin(DegreesToRadians(definition.InclinationDegrees)) * MathF.Min(definition.RadiusOffset * 0.04f, 25000f);
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var offset = new Vector3(
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MathF.Cos(definition.Angle) * definition.RadiusOffset,
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verticalOffset,
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MathF.Sin(definition.Angle) * definition.RadiusOffset);
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if (anchorCelestial is null)
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{
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return new Vector3(offset.X, yPlane + offset.Y, offset.Z);
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}
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return Add(anchorCelestial.Position, offset);
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}
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private static Vector3 ComputePlanetPosition(PlanetDefinition planet)
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{
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var angle = DegreesToRadians(planet.OrbitPhaseAtEpoch);
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var orbitRadiusKm = SimulationUnits.AuToKilometers(planet.OrbitRadius);
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return new Vector3(MathF.Cos(angle) * orbitRadiusKm, 0f, MathF.Sin(angle) * orbitRadiusKm);
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}
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private static Vector3 ComputeMoonPosition(Vector3 planetPosition, MoonDefinition moon)
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{
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var angle = DegreesToRadians(moon.OrbitPhaseAtEpoch);
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var local = new Vector3(MathF.Cos(angle) * moon.OrbitRadius, 0f, MathF.Sin(angle) * moon.OrbitRadius);
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return Add(planetPosition, local);
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}
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internal static ShipSpatialStateRuntime CreateInitialShipSpatialState(string systemId, Vector3 position, IReadOnlyCollection<CelestialRuntime> celestials)
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{
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var nearestCelestial = celestials
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.Where(c => c.SystemId == systemId)
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.OrderBy(c => c.Position.DistanceTo(position))
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.FirstOrDefault();
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return new ShipSpatialStateRuntime
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{
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CurrentSystemId = systemId,
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SpaceLayer = SpaceLayerKind.LocalSpace,
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CurrentCelestialId = nearestCelestial?.Id,
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LocalPosition = position,
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SystemPosition = position,
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MovementRegime = MovementRegimeKind.LocalFlight,
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};
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}
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}
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public sealed record ScenarioSpatialLayout(
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IReadOnlyDictionary<string, SystemSpatialGraph> SystemGraphs,
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List<CelestialRuntime> Celestials,
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List<ResourceNodeRuntime> Nodes);
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public sealed record SystemSpatialGraph(
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string SystemId,
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List<CelestialRuntime> Celestials,
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Dictionary<int, Dictionary<string, CelestialRuntime>> LagrangeNodesByPlanetIndex);
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internal sealed record LagrangePointPlacement(string Designation, Vector3 Position);
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internal sealed record StationPlacement(CelestialRuntime AnchorCelestial, Vector3 Position);
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