Class: ColorFun::Gradient

Inherits:
Object
  • Object
show all
Defined in:
lib/color_fun/gradient.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*colors) ⇒ Gradient

Returns a new instance of Gradient.



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# File 'lib/color_fun/gradient.rb', line 6

def initialize(*colors)
  @colors = colors
  @resolution = 100
end

Instance Attribute Details

#resolution ⇒ Object

Returns the value of attribute resolution.



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# File 'lib/color_fun/gradient.rb', line 4

def resolution
  @resolution
end

Instance Method Details

#at(point) ⇒ Object 



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# File 'lib/color_fun/gradient.rb', line 31

def at(point)
  window = point / color_window_size

  if point == @resolution
    difference = differences.last
    position = color_window_size
    window = differences.size - 1
  else
    difference = differences[window]
    position = point % color_window_size
  end

  new_colors = difference.each_with_index.map do |dc, i|
    (colors[window][i] + (dc * (position.to_f / color_window_size.to_f))).to_i
  end
  
  ColorFun::RGB.new(*new_colors)
end

#color_window_size ⇒ Object 



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# File 'lib/color_fun/gradient.rb', line 23

def color_window_size
  @resolution / differences.size
end

#colors ⇒ Object 



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# File 'lib/color_fun/gradient.rb', line 11

def colors
  @colors.map do |color|
    color.scan(/../).map { |c| c.to_i(16) }
  end
end

#differences ⇒ Object 



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# File 'lib/color_fun/gradient.rb', line 17

def differences
  colors[0..-2].each_with_index.map do |color, i|
    color.dup.each_with_index.map { |c, j| colors[i + 1][j] - c }
  end
end

#points ⇒ Object 



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# File 'lib/color_fun/gradient.rb', line 27

def points
  @resolution.times.map { |i| self.at(i) }
end