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EvasionTermTests: reach and evasion read each side of the envelope

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An asymmetric forward-only envelope pins the clockwise and counter-clockwise sides, the
mirrored direction, the two-sided average capped by the observed spread, and the track's
cross term.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Meta Vens 2026-10-07 03:37:31 +02:00
commit 2910a35dff
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tests/Aetheria.Shared.Tests/EvasionTermTests.cs
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@ -379,6 +379,33 @@ public sealed partial class RunStartTests
Assert.InRange((float) turned / EvDt, gemini.Envelope.Clockwise * .9f, gemini.Envelope.Clockwise * 1.1f);
}
// The reach and the evasion read each side of the envelope for themselves: a forward-only ship that turns clockwise
// fast and counter-clockwise slowly reaches further to its right than its left in the window, and its evasion
// across a line of sight is the average of what it reaches to either side, capped by the spread it is observed to
// make. A diagonal jink reads as unpredictable along the diagonal and not across it.
[Fact]
public void ReachAndEvasionReadEachSideOfTheEnvelope()
{
var forwardOnly = new ManoeuvreEnvelope(50, 0, 0, 0, 4, .5f);
var ahead = float2(0, 1);
var toRight = FireControl.Reach(forwardOnly, ahead, float2(1, 0), .75f);
var toLeft = FireControl.Reach(forwardOnly, ahead, float2(-1, 0), .75f);
Assert.True(toRight > 2 * toLeft && toLeft > 0f, $"right {toRight}, left {toLeft}");
var wild = default(ManoeuvreTrack);
for (var step = 0; step < 240; step++) wild.Observe(float2(step / 30 % 2 == 0 ? 500 : -500, 0), EvDt, .75f);
var evasion = FireControl.Evasion(forwardOnly, ahead, wild, float2(0, 1), .75f);
Assert.InRange(evasion, .5f * (toRight + toLeft) * .999f, .5f * (toRight + toLeft) * 1.001f);
var diagonal = default(ManoeuvreTrack);
for (var step = 0; step < 240; step++)
diagonal.Observe(float2(1, 1) * (step / 30 % 2 == 0 ? 40 : -40), EvDt, .75f);
var along = diagonal.LateralRms(normalize(float2(1, 1)));
var across = diagonal.LateralRms(normalize(float2(1, -1)));
Assert.InRange(along, diagonal.LateralRms(float2(1, 0)) * 1.414f * .97f, diagonal.LateralRms(float2(1, 0)) * 1.414f * 1.03f);
Assert.True(across < .05f * along, $"along {along}, across {across}");
}
// A station or any other non-Ship has no envelope; whatever it does, it does not evade.
[Fact]
public void NonShipsDoNotEvade()