Module: Abachrome::PaletteMixins::Resample

Defined in:
lib/abachrome/palette_mixins/resample.rb

Instance Method Summary collapse

Instance Method Details

#expand(new_size) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/abachrome/palette_mixins/resample.rb', line 34

def expand(new_size)
  raise ArgumentError, "New size must be larger than current size" if new_size <= size

  resample(new_size)
end

#expand!(new_size) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/abachrome/palette_mixins/resample.rb', line 40

def expand!(new_size)
  raise ArgumentError, "New size must be larger than current size" if new_size <= size

  resample!(new_size)
end

#reduce(new_size) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/abachrome/palette_mixins/resample.rb', line 46

def reduce(new_size)
  raise ArgumentError, "New size must be smaller than current size" if new_size >= size

  resample(new_size)
end

#reduce!(new_size) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/abachrome/palette_mixins/resample.rb', line 52

def reduce!(new_size)
  raise ArgumentError, "New size must be smaller than current size" if new_size >= size

  resample!(new_size)
end

#resample(new_size) ⇒ Object 



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# File 'lib/abachrome/palette_mixins/resample.rb', line 6

def resample(new_size)
  return self if new_size == size || empty?
  return self.class.new([@colors.first]) if new_size == 1

  step = (size - 1).to_f / (new_size - 1)

  self.class.new(
    (0...new_size).map do |i|
      index = i * step
      lower_index = index.floor
      upper_index = [lower_index + 1, size - 1].min

      if lower_index == upper_index
        @colors[lower_index]
      else
        fraction = index - lower_index
        @colors[lower_index].blend(@colors[upper_index], fraction)
      end
    end
  )
end

#resample!(new_size) ⇒ Object 



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# File 'lib/abachrome/palette_mixins/resample.rb', line 28

def resample!(new_size)
  resampled = resample(new_size)
  @colors = resampled.colors
  self
end