1 files changed, 0 insertions, 89 deletions
diff --git a/lib/leaves/physics.ts b/lib/leaves/physics.ts
deleted file mode 100644
index 9510311..0000000
--- a/lib/leaves/physics.ts
+++ /dev/null
@@ -1,89 +0,0 @@
-import type { Leaf, SceneDimensions, WindSystem } from '@hollowdark/lib/leaves/types'
-import { windForceAt } from '@hollowdark/lib/leaves/wind'
-
-const GRAVITY_PX_PER_S2 = 14
-const TERMINAL_VY_PX_PER_S = 35
-const WIND_FORCE_SCALE = 0.55
-const SWAY_AMPLITUDE_PX_PER_S = 16
-const HORIZONTAL_DRAG_PER_FRAME = 0.98
-const VERTICAL_DRAG_PER_FRAME = 0.995
-const SETTLED_HORIZONTAL_DRAG_PER_FRAME = 0.88
-const SETTLED_ROT_DAMPING_PER_FRAME = 0.92
-const SETTLE_LIFT_THRESHOLD = 30
-const OFFSCREEN_MARGIN_PX = 140
-
-/**
- * Step one leaf forward by `dt` seconds. Applies wind-derived acceleration,
- * gravity, drag, and rotation. Ground collision settles the leaf; strong
- * upward force from a nearby gust can lift it again.
- */
-export function stepLeaf(
-  leaf: Leaf,
-  dt: number,
-  timeS: number,
-  wind: WindSystem,
-  scene: SceneDimensions
-): Leaf {
-  const { fx, fy } = windForceAt(wind, leaf.x, leaf.y)
-
-  const sway = leaf.settled
-    ? 0
-    : SWAY_AMPLITUDE_PX_PER_S *
-      leaf.swayFrequency *
-      Math.cos(leaf.swayPhase + timeS * leaf.swayFrequency * Math.PI * 2)
-
-  let vx = leaf.vx + (fx * WIND_FORCE_SCALE + sway) * dt
-  let vy = leaf.vy + fy * WIND_FORCE_SCALE * dt
-
-  if (!leaf.settled) {
-    vy = Math.min(TERMINAL_VY_PX_PER_S, vy + GRAVITY_PX_PER_S2 * dt)
-  }
-
-  const frames = dt * 60
-  vx *= Math.pow(HORIZONTAL_DRAG_PER_FRAME, frames)
-  vy *= Math.pow(VERTICAL_DRAG_PER_FRAME, frames)
-
-  if (leaf.settled) {
-    vx *= Math.pow(SETTLED_HORIZONTAL_DRAG_PER_FRAME, frames)
-  }
-
-  const x = leaf.x + vx * dt
-  let y = leaf.y + (leaf.settled ? 0 : vy * dt)
-
-  let settled = leaf.settled
-  if (!settled && y >= scene.groundY) {
-    settled = true
-    y = scene.groundY
-    vy = Math.min(0, vy)
-  }
-
-  if (settled && vy < -SETTLE_LIFT_THRESHOLD) {
-    settled = false
-  }
-
-  let rotationSpeed = leaf.rotationSpeed
-  if (settled) {
-    rotationSpeed *= Math.pow(SETTLED_ROT_DAMPING_PER_FRAME, frames)
-  }
-  const rotation = leaf.rotation + rotationSpeed * dt
-
-  return {
-    ...leaf,
-    x,
-    y,
-    vx,
-    vy,
-    rotation,
-    rotationSpeed,
-    settled
-  }
-}
-
-/** A leaf has drifted far enough off-screen to drop from the array. */
-export function isLeafOffscreen(leaf: Leaf, scene: SceneDimensions): boolean {
-  return (
-    leaf.x < -OFFSCREEN_MARGIN_PX ||
-    leaf.x > scene.width + OFFSCREEN_MARGIN_PX ||
-    leaf.y > scene.height + OFFSCREEN_MARGIN_PX
-  )
-}