036f75a0d8
Reads only the ship's velocity after the zone steps; reintroducing drag below top speed fails both cases (50 -> 18.39 in 10 s). Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
48 lines
2.3 KiB
C#
48 lines
2.3 KiB
C#
using System;
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using CultMath;
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using Xunit;
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using static CultMath.math;
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using float3 = CultMath.float3;
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using Random = CultMath.Random;
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// The consumer's side of aetheria-gravity:ruling:no-drag-below-top-speed: a ship launched below its hull's top speed and
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// left alone keeps that speed, at the global thrust tuning the game ships with (GameplaySettings.ThrustScale 0.1) as well as
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// at the fixtures' 1. Reads only the ship's velocity after the zone steps: not Drag, DragScale or any field of the fix.
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// Kills: drag reintroduced below top speed, or any deceleration whose size depends on ThrustScale.
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public sealed class CoastingTests
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{
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private const float PlayThrustScale = .1f; // GameplaySettings.ThrustScale's default, the value play runs at
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private static float CoastedSpeed(float thrustScale, float launchSpeed, float seconds)
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{
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using var cache = RestoredHullsTests.OpenCatalog();
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var hull = cache.GetByName<HullData>("Longinus");
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var settings = RestoredHullsTests.Settings();
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settings.ThrustScale = thrustScale;
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var items = new ItemManager(1u, cache, new ProvenanceLedger(), settings, _ => { });
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items.Random = new Random(1u);
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var random = new Random(1);
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var pack = new LoadoutGenerator(ref random, items, null, null, null, .5f).GenerateShipLoadout(candidate => candidate == hull);
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Assert.NotNull(pack);
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var zone = new Zone(items, new PlanetSettings(), new ZonePack(), new GalaxyZone { Name = "Test", Owner = null }, null);
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var ship = (Ship) EntitySerializer.Unpack(items, zone, pack);
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zone.Admit(ship, piloted: false);
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ship.Position = float3.zero;
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zone.Update(0f);
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ship.MovementDirection = float2(0, 0);
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ship.Velocity = float2(0, launchSpeed);
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for (var i = 0; i < (int) (seconds * 60); i++) zone.Update(1f / 60f);
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return length(ship.Velocity);
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}
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[Theory]
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[InlineData(PlayThrustScale)]
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[InlineData(1f)]
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public void AShipLaunchedBelowTopSpeedKeepsItsSpeed(float thrustScale)
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{
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const float launch = 50f; // Longinus's top speed is 100
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var speed = CoastedSpeed(thrustScale, launch, 10f);
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Assert.True(speed >= launch - .01f, $"ThrustScale {thrustScale}: launched at {launch}, coasting 10 s left it at {speed}");
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}
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}
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