Class: Music::Performance::ValueComputer

Inherits:
Object
  • Object
show all
Defined in:
lib/music-performance/util/value_computer.rb

Overview

Given a start value, and value changes, compute the value at any offset.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(start_value, value_changes = {}) ⇒ ValueComputer

Returns a new instance of ValueComputer.



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# File 'lib/music-performance/util/value_computer.rb', line 8

def initialize start_value, value_changes = {}
  @piecewise_function = PiecewiseFunction.new
  set_default_value start_value
  
  if value_changes.any?
    value_changes.sort.each do |offset,change|
      
      case change
      when Music::Transcription::Change::Immediate
        add_immediate_change change, offset
      when Music::Transcription::Change::Gradual
        add_linear_change change, offset
      #  add_sigmoid_change change, offset
      end
      
    end
  end
end

Instance Attribute Details

#piecewise_function ⇒ Object (readonly)

Returns the value of attribute piecewise_function.



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# File 'lib/music-performance/util/value_computer.rb', line 6

def piecewise_function
  @piecewise_function
end

Class Method Details

.domain_max ⇒ Object

finds the maximum domain value



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# File 'lib/music-performance/util/value_computer.rb', line 56

def self.domain_max
  Float::INFINITY
end

.domain_min ⇒ Object

finds the minimum domain value



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# File 'lib/music-performance/util/value_computer.rb', line 51

def self.domain_min
  -Float::INFINITY
end

Instance Method Details

#domain_max ⇒ Object

finds the maximum domain value



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# File 'lib/music-performance/util/value_computer.rb', line 46

def domain_max
  Float::INFINITY
end

#domain_min ⇒ Object

finds the minimum domain value



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# File 'lib/music-performance/util/value_computer.rb', line 41

def domain_min
  -Float::INFINITY
end

#sample(xmin, xmax, srate) ⇒ Object 



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# File 'lib/music-performance/util/value_computer.rb', line 33

def sample xmin, xmax, srate
  sample_period = Rational(1,srate)
  ((xmin.to_r)..(xmax.to_r)).step(sample_period).map do |x|
    value_at(x)
  end
end

#value_at(offset) ⇒ Object

Compute the value at the given offset.

Parameters:

  • offset (Numeric) —

    The given offset to compute value at.



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# File 'lib/music-performance/util/value_computer.rb', line 29

def value_at offset
  @piecewise_function.eval offset
end