SirStone
c94ba1f2fe
- Decay-GF: exponential decay on GF histogram (0.998/tick, ~350-tick half-life) - Adapts faster to mid-battle strategy changes than standard GF - Battle-tested vs WaveSurfer, Crazy, RandomMover
97 lines
2.8 KiB
Nim
97 lines
2.8 KiB
Nim
## Recency-weighted GF gun: exponential decay on histogram bins.
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## decay=0.998/tick gives ~350-tick half-life — adapts to mid-battle strategy shifts.
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## Everything else identical to guess_factor.nim.
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import std/math
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import gun_harness/gun_interface
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const
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GFBins = 31
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GFPrior = 0.1
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DecayRate = 0.998 # ponytail: single global decay, tune if adaptation too slow/fast
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type
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DWave = object
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fireX, fireY: float
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fireBearing: float
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DecayGFGun* = object
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bins: array[GFBins, float]
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waves: seq[DWave]
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cachedTick: int
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cachedWaveStored: bool
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proc initDecayGFGun*(): DecayGFGun =
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result.cachedTick = -1
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let center = (GFBins - 1) div 2
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for i in 0..<GFBins:
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let d = abs(i - center)
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result.bins[i] = GFPrior + 0.5 / float(1 + d)
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proc gfToIndex(gf: float): int {.inline.} =
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clamp(int(round((gf + 1.0) * 0.5 * float(GFBins - 1))), 0, GFBins - 1)
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proc indexToGF(idx: int): float {.inline.} =
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float(idx) / float(GFBins - 1) * 2.0 - 1.0
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proc peakBin(g: DecayGFGun): int =
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var best = 0
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for i in 1..<GFBins:
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if g.bins[i] > g.bins[best]:
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best = i
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best
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proc predict*(g: var DecayGFGun, state: WorldState, bulletSpeed: float): GunPrediction =
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if bulletSpeed <= 0.0:
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return GunPrediction(x: state.enemyX, y: state.enemyY)
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let dx = state.enemyX - state.selfX
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let dy = state.enemyY - state.selfY
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let dist = sqrt(dx*dx + dy*dy)
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let bearing = arctan2(dy, dx)
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let mea = arcsin(clamp(8.0 / bulletSpeed, -1.0, 1.0))
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if state.tick != g.cachedTick:
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# Decay all bins once per tick
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for i in 0..<GFBins:
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g.bins[i] *= DecayRate
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g.cachedTick = state.tick
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g.cachedWaveStored = false
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if not g.cachedWaveStored:
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g.waves.add DWave(fireX: state.selfX, fireY: state.selfY, fireBearing: bearing)
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g.cachedWaveStored = true
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let peak = g.peakBin()
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let peakGF = indexToGF(peak)
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let gfAngle = bearing + peakGF * mea
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let px = state.selfX + cos(gfAngle) * dist
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let py = state.selfY + sin(gfAngle) * dist
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GunPrediction(
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x: clamp(px, BotRadius, state.arenaWidth - BotRadius),
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y: clamp(py, BotRadius, state.arenaHeight - BotRadius),
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)
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proc onResult*(g: var DecayGFGun, e: FeedbackEvent) =
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if g.waves.len == 0: return
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let w = g.waves[0]
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g.waves.delete(0)
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let speed = bulletSpeed(e.bulletPower)
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let mea = arcsin(clamp(8.0 / speed, -1.0, 1.0))
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let actualDx = e.actualX - w.fireX
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let actualDy = e.actualY - w.fireY
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let actualBearing = arctan2(actualDy, actualDx)
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var bearingDelta = actualBearing - w.fireBearing
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while bearingDelta > PI: bearingDelta -= 2.0*PI
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while bearingDelta < -PI: bearingDelta += 2.0*PI
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let gf = if mea > 1e-10: clamp(bearingDelta / mea, -1.0, 1.0) else: 0.0
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let centerIdx = gfToIndex(gf)
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for i in 0..<GFBins:
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let d = abs(i - centerIdx)
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g.bins[i] += 1.0 / float(1 + d)
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