strudel/packages/motion

@strudel/motion

This package adds device motion sensing functionality to strudel Patterns.

Install

npm i @strudel/motion --save

Setup SSL for Local Development

DeviceMotionEvent only works with HTTPS, so you'll need to enable SSL for local development. Try installing an SSL plugin for Vite.

cd website
pnpm install -D @vitejs/plugin-basic-ssl

add the basicSsl plugin to the defineConfig block in strudel/website/astro.config.mjs

vite: {
  plugins: [basicSsl()],
  server: {
    host: '0.0.0.0', // Ensures it binds to all network interfaces
    // https: { 
    //   key: '../../key.pem', //
    //   cert: '../../cert.pem',
    // },
  },
},

generate an SSL certificate to avoid security warnings.

openssl req -new -newkey rsa:2048 -days 365 -nodes -x509 -keyout key.pem -out cert.pem

Usage

Motion	Long Names & Aliases	Description
Acceleration	accelerationX (accX), accelerationY (accY), accelerationZ (accZ)	X, Y, Z-axis acceleration values
Gravity	gravityX (gravX), gravityY (gravY), gravityZ (gravZ)	X, Y, Z-axis gravity values
Rotation	rotationAlpha (rotA, rotZ), rotationBeta (rotB, rotX), rotationGamma (rotG, rotY)	Rotation around alpha, beta, gamma axes and mapped to X, Y, Z
Orientation	orientationAlpha (oriA, oriZ), orientationBeta (oriB, oriX), orientationGamma (oriG, oriY)	Orientation alpha, beta, gamma values and mapped to X, Y, Z
Absolute Orientation	absoluteOrientationAlpha (absOriA, absOriZ), absoluteOrientationBeta (absOriB, absOriX), absoluteOrientationGamma (absOriG, absOriY)	Absolute orientation alpha, beta, gamma values and mapped to X, Y, Z

Example

enableMotion() //enable DeviceMotion 

let tempo = 200

$_: accX.segment(16).gain().log()

$:n("[0 1 3 1 5 4]/4")
  .scale("Bb:lydian")
  .sometimesBy(0.5,sub(note(12)))
  .lpf(gravityY.range(20,1000))
  .lpq(gravityZ.range(1,30))
  .lpenv(gravityX.range(2,2))
  .gain(oriX.range(0.2,0.8))
  .room(oriZ.range(0,0.5))
  .attack(oriY.range(0,0.3))
  .delay(rotG.range(0,1))
  .decay(rotA.range(0,1))
  .attack(rotB.range(0,0.1))
  .sound("sawtooth").cpm(tempo)