Class: Sunniesnow::Charter::BpmChangeList

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/sscharter/charter/beat.rb

Defined Under Namespace

Classes: BpmChange

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(offset) ⇒ BpmChangeList

Returns a new instance of BpmChangeList.

Parameters:

  • offset (Float) 


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# File 'lib/sscharter/charter/beat.rb', line 55

def initialize offset
	@offset = offset
	@list = []
end

Instance Attribute Details

#offset ⇒ Float

Returns:

  • (Float) 


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# File 'lib/sscharter/charter/beat.rb', line 52

def offset
  @offset
end

Instance Method Details

#[](index) ⇒ BpmChange?

Parameters:

  • index (Integer)

Returns:



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# File 'lib/sscharter/charter/beat.rb', line 101

def [] index
	@list[index]
end

#add(beat, bpm) ⇒ BpmChangeList

Returns self.

Parameters:

  • beat (Rational)
  • bpm (Float)

Returns:



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# File 'lib/sscharter/charter/beat.rb', line 63

def add beat, bpm
	if index = @list.bsearch_index { beat <=> _1.beat }
		@list[index].bpm = bpm
	else
		@list.push BpmChange.new beat, bpm
		@list.sort!
	end
	self
end

#bps_after(beat) ⇒ Float

Parameters:

  • beat (Rational)

Returns:

  • (Float)

Raises:

  • (ArgumentError) 


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# File 'lib/sscharter/charter/beat.rb', line 94

def bps_after beat
	raise ArgumentError, 'beat is before the first bpm change' if beat < @list.first.beat
	@list[@list.bisect(right: true) { _1.beat <=> beat }].bps
end

#bps_before(beat) ⇒ Float

Parameters:

  • beat (Rational)

Returns:

  • (Float)

Raises:

  • (ArgumentError) 


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# File 'lib/sscharter/charter/beat.rb', line 87

def bps_before beat
	raise ArgumentError, 'beat is before or at the first bpm change' if beat <= @list.first.beat
	@list[@list.bisect(right: false) { _1.beat <=> beat } - 1].bps
end

#each {|| ... } ⇒ Object

Yield Parameters:



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# File 'lib/sscharter/charter/beat.rb', line 106

def each(...)
	@list.each(...)
	self
end

#time_at(beat) ⇒ Float

Parameters:

  • beat (Rational)

Returns:

  • (Float)

Raises:

  • (ArgumentError) 


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# File 'lib/sscharter/charter/beat.rb', line 75

def time_at beat
	index = @list.bisect(right: true) { _1.beat <=> beat }
	raise ArgumentError, 'beat is before the first bpm change' if index < 0
	bpm = @list[index]
	(0...index).sum @offset + (beat - bpm.beat) / bpm.bps do |i|
		bpm = @list[i]
		(@list[i+1].beat - bpm.beat) / bpm.bps
	end
end