gibberish-dsp/js/envelopes/ramp.js

Gibberish is designed to be an optimized API for audio synthesis using per-sample techniques.

const ugen = require( '../ugen.js' ),
      g = require( 'genish.js' )

module.exports = function( Gibberish ) {

  const Ramp = function( argumentProps ) {
    const ramp   = Object.create( ugen ),
          length = g.in( 'length' ),
          from   = g.in( 'from' ),
          to     = g.in( 'to' )

    const props = Object.assign({}, Ramp.defaults, argumentProps )

    const reset = g.bang()

    const phase = g.accum( g.div( 1, length ), reset, { shouldWrap:props.shouldLoop, shouldClamp:true }),
          diff = g.sub( to, from ),
          graph = g.add( from, g.mul( phase, diff ) )
        
    ramp.trigger = reset.trigger

    const out = Gibberish.factory( ramp, graph, ['envelopes','ramp'], props )


    return out
  }

  Ramp.defaults = { from:0, to:1, length:g.gen.samplerate, shouldLoop:false }

  return Ramp

}