Simple Wave Functions

waves.cr

def sine(input, amplitude, phase, frequency = nil, angular_frequency = nil)
  if frequency
    amplitude * Math.sin(2 * Math::PI * frequency * input + phase)
  elsif angular_frequency
    amplitude * Math.sin(angular_frequency * input + phase)
  else
    raise "Either frequency or angular_frequency is required"
  end
end

# For given running `input`, `amplitude`, and `period`
# generates a triangle wave.
def triangle(input, amplitude, period)
  hp = p / 2
  (a / p) * (p - (x % (2 * p) - p).abs)
end