54 lines
1.8 KiB
C#
54 lines
1.8 KiB
C#
using System;
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using System.Collections;
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using System.Collections.Generic;
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using Unity.Mathematics;
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using static Unity.Mathematics.math;
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using float2 = Unity.Mathematics.float2;
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public class OrbitalEntity : Entity
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{
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private Guid _orbitData;
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private static Dictionary<Guid, float2> _orbitPositions = new Dictionary<Guid, float2>();
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public OrbitalEntity(GameContext context, Gear hull, IEnumerable<Gear> items, IEnumerable<ItemInstance> cargo, Guid orbit) : base(context, hull, items, cargo)
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{
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_orbitData = orbit;
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}
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public static void ClearOrbits()
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{
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_orbitPositions.Clear();
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}
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// Determine orbital position recursively, caching parent positions to avoid repeated calculations
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private float2 GetOrbitPosition(Guid orbit)
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{
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// Root orbit is fixed at center
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if(orbit==Guid.Empty)
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return float2.zero;
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if (!_orbitPositions.ContainsKey(orbit))
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{
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var orbitData = Context.Cache.Get<OrbitData>(orbit);
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_orbitPositions[orbit] = GetOrbitPosition(orbitData.Parent) + (orbitData.Period < .01f ? float2.zero :
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OrbitData.Evaluate((float) (Context.Time / -orbitData.Period * Context.GlobalData.OrbitSpeedMultiplier + orbitData.Phase)) *
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orbitData.Distance);
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}
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var position = _orbitPositions[orbit];
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if (float.IsNaN(position.x))
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{
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Context.Log("Orbit position is NaN, something went very wrong!");
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return float2.zero;
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}
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return _orbitPositions[orbit];
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}
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public override void Update(float delta)
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{
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var newPosition = GetOrbitPosition(_orbitData);
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Velocity = (newPosition - Position) / delta;
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Position = newPosition;
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base.Update(delta);
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}
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}
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