genish.js/js/mtof.js

gen~ in js

'use strict'

let gen  = require('./gen.js')

let proto = {
  name:'mtof',

  gen() {
    let out,
        inputs = gen.getInputs( this )

    if( isNaN( inputs[0] ) ) {
      gen.closures.add({ [ this.name ]: Math.exp })

      out = `( ${this.tuning} * gen.exp( .057762265 * (${inputs[0]} - 69) ) )`

    } else {
      out = this.tuning * Math.exp( .057762265 * ( inputs[0] - 69) )
    }
    
    return out
  }
}

module.exports = ( x, props ) => {
  let ugen = Object.create( proto ),
      defaults = { tuning:440 }
  
  if( props !== undefined ) Object.assign( props.defaults )

  Object.assign( ugen, defaults )
  ugen.inputs = [ x ]
  

  return ugen
}