nuts / files / src / motion.ts
motion.ts
| 1 | import { CONFIG } from './config' |
| 2 | import { vibrateShake } from './vibration' |
| 3 | import { dbg, dbgError } from './debug' |
| 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 | ) { |
| 19 | const result = await ( |
| 20 | DeviceMotionEvent as unknown as { requestPermission: () => Promise<string> } |
| 21 | ).requestPermission() |
| 22 | dbg('DeviceMotionEvent permission:', result) |
| 23 | } else { |
| 24 | dbg('DeviceMotionEvent: no permission API (Android or desktop)') |
| 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 | ) { |
| 34 | const result = await ( |
| 35 | DeviceOrientationEvent as unknown as { requestPermission: () => Promise<string> } |
| 36 | ).requestPermission() |
| 37 | dbg('DeviceOrientationEvent permission:', result) |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | /** Attach DeviceMotion (shake) and DeviceOrientation (gravity tilt) listeners. */ |
| 42 | export function initMotion(callbacks: MotionCallbacks): () => void { |
| 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 | |
| 52 | let prevX = 0 |
| 53 | let prevY = 0 |
| 54 | let prevZ = 0 |
| 55 | let lastCheckAt = 0 |
| 56 | let motionCount = 0 |
| 57 | let orientationCount = 0 |
| 58 | |
| 59 | function onMotion(event: DeviceMotionEvent): void { |
| 60 | motionCount++ |
| 61 | if (motionCount === 1) dbg('first devicemotion event') |
| 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 { |
| 88 | orientationCount++ |
| 89 | if (orientationCount === 1) dbg('first deviceorientation event') |
| 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 | } |