motion.ts

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`44eb5832` 2026-04-12 Pavel Safronov	1	import { CONFIG } from './config'
	2	import { vibrateShake } from './vibration'
`f1262fd9` 2026-04-12 Pavel Safronov	3	import { dbg, dbgError } from './debug'
`44eb5832` 2026-04-12 Pavel Safronov	4
	5	export interface MotionCallbacks {
	6	onShake: (intensity: number) => void
	7	onOrientation: (gravX: number, gravY: number) => void
	8	}
	9
	10	/** Request iOS 13+ permission for DeviceMotion/DeviceOrientation. */
	11	export async function requestMotionPermission(): Promise<void> {
	12	// DeviceMotionEvent
	13	if (
	14	typeof DeviceMotionEvent !== 'undefined' &&
	15	'requestPermission' in DeviceMotionEvent &&
	16	typeof (DeviceMotionEvent as unknown as { requestPermission: () => Promise<string> })
	17	.requestPermission === 'function'
	18	) {
`f1262fd9` 2026-04-12 Pavel Safronov	19	const result = await (
`44eb5832` 2026-04-12 Pavel Safronov	20	DeviceMotionEvent as unknown as { requestPermission: () => Promise<string> }
	21	).requestPermission()
`f1262fd9` 2026-04-12 Pavel Safronov	22	dbg('DeviceMotionEvent permission:', result)
	23	} else {
	24	dbg('DeviceMotionEvent: no permission API (Android or desktop)')
`44eb5832` 2026-04-12 Pavel Safronov	25	}
	26
	27	// DeviceOrientationEvent
	28	if (
	29	typeof DeviceOrientationEvent !== 'undefined' &&
	30	'requestPermission' in DeviceOrientationEvent &&
	31	typeof (DeviceOrientationEvent as unknown as { requestPermission: () => Promise<string> })
	32	.requestPermission === 'function'
	33	) {
`f1262fd9` 2026-04-12 Pavel Safronov	34	const result = await (
`44eb5832` 2026-04-12 Pavel Safronov	35	DeviceOrientationEvent as unknown as { requestPermission: () => Promise<string> }
	36	).requestPermission()
`f1262fd9` 2026-04-12 Pavel Safronov	37	dbg('DeviceOrientationEvent permission:', result)
`44eb5832` 2026-04-12 Pavel Safronov	38	}
	39	}
	40
	41	/** Attach DeviceMotion (shake) and DeviceOrientation (gravity tilt) listeners. */
	42	export function initMotion(callbacks: MotionCallbacks): () => void {
`f1262fd9` 2026-04-12 Pavel Safronov	43	dbg('initMotion: attaching listeners, secure?', location.protocol)
	44
	45	if (typeof DeviceMotionEvent === 'undefined') {
	46	dbgError('DeviceMotionEvent not available')
	47	}
	48	if (typeof DeviceOrientationEvent === 'undefined') {
	49	dbgError('DeviceOrientationEvent not available')
	50	}
	51
`44eb5832` 2026-04-12 Pavel Safronov	52	let prevX = 0
	53	let prevY = 0
	54	let prevZ = 0
	55	let lastCheckAt = 0
`f1262fd9` 2026-04-12 Pavel Safronov	56	let motionCount = 0
	57	let orientationCount = 0
`44eb5832` 2026-04-12 Pavel Safronov	58
	59	function onMotion(event: DeviceMotionEvent): void {
`f1262fd9` 2026-04-12 Pavel Safronov	60	motionCount++
	61	if (motionCount === 1) dbg('first devicemotion event')
`44eb5832` 2026-04-12 Pavel Safronov	62	const acc = event.accelerationIncludingGravity
	63	if (!acc) return
	64
	65	const now = Date.now()
	66	if (now - lastCheckAt < 80) return // limit check rate to ~12 Hz
	67	lastCheckAt = now
	68
	69	const ax = acc.x ?? 0
	70	const ay = acc.y ?? 0
	71	const az = acc.z ?? 0
	72
	73	const delta = Math.sqrt(
	74	(ax - prevX) 2 + (ay - prevY) 2 + (az - prevZ) ** 2
	75	)
	76
	77	if (delta > CONFIG.shakeAccelThreshold) {
	78	callbacks.onShake(delta)
	79	vibrateShake()
	80	}
	81
	82	prevX = ax
	83	prevY = ay
	84	prevZ = az
	85	}
	86
	87	function onOrientation(event: DeviceOrientationEvent): void {
`f1262fd9` 2026-04-12 Pavel Safronov	88	orientationCount++
	89	if (orientationCount === 1) dbg('first deviceorientation event')
`44eb5832` 2026-04-12 Pavel Safronov	90	if (event.beta === null \|\| event.gamma === null) return
	91
	92	// beta = front/back tilt, 0 = flat, 90 = vertical facing up
	93	// gamma = left/right tilt, -90…90
	94	const clamp = (v: number, min: number, max: number) =>
	95	Math.max(min, Math.min(max, v))
	96
	97	const beta = clamp(event.beta, -CONFIG.orientationMaxTilt, CONFIG.orientationMaxTilt)
	98	const gamma = clamp(event.gamma, -90, 90)
	99
	100	// Map to gravity vector components. Normalise so magnitude ≤ 1.
	101	const gx = Math.sin((gamma * Math.PI) / 180)
	102	const gy = Math.sin((beta * Math.PI) / 180)
	103
	104	callbacks.onOrientation(gx, gy)
	105	}
	106
	107	window.addEventListener('devicemotion', onMotion)
	108	window.addEventListener('deviceorientation', onOrientation)
	109
	110	return () => {
	111	window.removeEventListener('devicemotion', onMotion)
	112	window.removeEventListener('deviceorientation', onOrientation)
	113	}
	114	}