SirStone
fd22535f5b
arctan2(dy, dx) gives east-based math bearing; Tank Royale uses north=0°, CW+. Swapping to arctan2(dx, dy) gives the correct game-space bearing. Symptom: radar commanded 45°/tick away from a target directly ahead. Adds test_radar_lock.nim as regression test (20-tick lock, ±15° tolerance). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
43 lines
1.4 KiB
Nim
43 lines
1.4 KiB
Nim
## Regression test: radar lock must hold on a stationary target.
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## Run: nim c -r tests/test_radar_lock.nim
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import std/[math, strformat]
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import "../enemy_tracker"
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template check(cond: bool, msg: string) =
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if not cond:
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quit("FAIL: " & msg, 1)
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# Bot at arena center; stationary enemy due north (same x, higher y).
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# Tank Royale: y increases northward.
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# True bearing to enemy = 0° (north = 0° in game coords).
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let botX = 400.0
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let botY = 300.0
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let enemyX = 400.0 # same x → dx = 0
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let enemyY = 500.0 # north of bot → dy > 0
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let trueBearing = 0.0 # north
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# Radar starts pointing at the enemy (radarDirection = 0°, due north).
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var radarDir = 0.0
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var tracker = initEnemyTracker()
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# Prime with contact at the known position
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tracker.update(enemyX, enemyY, 0.0, 0.0, 100.0)
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echo "Tick | radarDir | trueBearing | bearingErr"
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for tick in 1 .. 20:
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let rate = tracker.getRadarTurnRate(botX, botY, 0.0, radarDir)
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radarDir = (radarDir + rate + 360.0) mod 360.0
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# Simulate a successful scan every tick (enemy is stationary)
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tracker.update(enemyX, enemyY, 0.0, 0.0, 100.0)
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# Bearing error: signed difference, wrapped to [-180, 180]
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let err = ((radarDir - trueBearing) + 540.0) mod 360.0 - 180.0
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echo &" {tick:2d} | {radarDir:8.3f}° | {trueBearing:8.3f}° | {err:+.3f}°"
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check abs(err) <= 15.0, &"tick {tick}: radar {radarDir:.1f}° drifted > 15° from target {trueBearing:.1f}°"
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echo "All radar lock tests passed"
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