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Contents
class ProgressBar
module Projectors
class SmoothedAverage
DEFAULT_STRENGTH = 0.1
DEFAULT_BEGINNING_POSITION = 0
attr_accessor :samples,
:strength
attr_reader :projection
def initialize(options = {})
self.samples = []
self.projection = 0.0
self.strength = options[:strength] || DEFAULT_STRENGTH
start(:at => DEFAULT_BEGINNING_POSITION)
end
def start(options = {})
self.projection = 0.0
self.progress = samples[0] = (options[:at] || progress)
end
def decrement
self.progress -= 1
end
def increment
self.progress += 1
end
def progress
samples[1]
end
def total=(_new_total); end
def reset
start(:at => samples[0])
end
def progress=(new_progress)
samples[1] = new_progress
self.projection = \
self.class.calculate(
@projection,
absolute,
strength
)
end
def none?
projection.zero?
end
def self.calculate(current_projection, new_value, rate)
(new_value * (1.0 - rate)) + (current_projection * rate)
end
protected
attr_writer :projection
private
def absolute
samples[1] - samples[0]
end
end
end
end
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