Class: Synthesizer::Modulation::Glide

Inherits:
Object
  • Object
show all
Defined in:
lib/synthesizer/modulation/glide.rb

Instance Method Summary collapse

Constructor Details

#initialize(time:) ⇒ Glide

Returns a new instance of Glide.

Parameters:

  • time (AudioStream::Rate | Float) —

    glide time sec (0.0~)



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# File 'lib/synthesizer/modulation/glide.rb', line 6

def initialize(time:)
  @time = AudioStream::Rate.sec(time)

  @base = 0.0
  @current = 0.0
  @target = 0.0
  @diff = 0.0
end

Instance Method Details

#balance_generator(note_perform, samplecount, depth) ⇒ Object 



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# File 'lib/synthesizer/modulation/glide.rb', line 64

def balance_generator(note_perform, samplecount, depth)
  gen = generator(note_perform, samplecount)

  -> {
    gen[] * depth
  }
end

#base=(base) ⇒ Object 



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# File 'lib/synthesizer/modulation/glide.rb', line 15

def base=(base)
  base = base.to_f

  @base = base
  @current = base
  @target = base
  @diff = 0.0
end

#generator(note_perform, samplecount) ⇒ Object 



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# File 'lib/synthesizer/modulation/glide.rb', line 29

def generator(note_perform, samplecount)
  soundinfo = note_perform.synth.soundinfo
  rate = @time.sample(soundinfo) / samplecount

  -> {
    ret = nil

    if !note_perform.released?
      # Note On
      if 0<rate && @target!=@current
        # Gliding
        x = @diff / rate
        if x.abs<(@target-@current).abs
          @current += x
        else
          @current = @target
        end

        ret = @current - @base
      else
        # Stay
        ret = @target - @base
      end
    else
      # Note Off
      @current = 0.0
      @target = 0.0
      @diff = 0.0
      ret = 0.0
    end

    ret
  }
end

#target=(target) ⇒ Object 



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# File 'lib/synthesizer/modulation/glide.rb', line 24

def target=(target)
  @target = target
  @diff = target - @current
end

#to_modval ⇒ Object 



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# File 'lib/synthesizer/modulation/glide.rb', line 72

def to_modval
  @modval ||= ModulationValue.create(0).add(self)
end