Class: Colors::LinearSegmentedColormap

Inherits:
Colormap
  • Object
show all
Defined in:
lib/colors/linear_segmented_colormap.rb

Constant Summary

Constants inherited from Colormap

Colormap::PNG_HEIGHT, Colormap::PNG_WIDTH

Instance Attribute Summary collapse

Attributes inherited from Colormap

#n_colors, #name

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Colormap

#[], #over_color, #over_color=, #reversed, #to_html, #to_png, #under_color, #under_color=

Constructor Details

#initialize(name, segmented_data, n_colors: 256, gamma: 1.0) ⇒ LinearSegmentedColormap

Returns a new instance of LinearSegmentedColormap.



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# File 'lib/colors/linear_segmented_colormap.rb', line 3

def initialize(name, segmented_data, n_colors: 256, gamma: 1.0)
  super(name, n_colors)

  @monochrome = false
  @segmented_data = segmented_data
  @gamma = gamma
end

Instance Attribute Details

#gamma ⇒ Object

Returns the value of attribute gamma.



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# File 'lib/colors/linear_segmented_colormap.rb', line 11

def gamma
  @gamma
end

#segmented_data ⇒ Object (readonly)

Returns the value of attribute segmented_data.



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# File 'lib/colors/linear_segmented_colormap.rb', line 11

def segmented_data
  @segmented_data
end

Class Method Details

.new_from_list(name, colors, n_colors: 256, gamma: 1.0) ⇒ Object 



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# File 'lib/colors/linear_segmented_colormap.rb', line 13

def self.new_from_list(name, colors, n_colors: 256, gamma: 1.0)
  case colors
  when Enumerable
    colors = colors.to_a
  else
    ary = Array.try_convert(colors)
    if ary.nil?
      raise ArgumentError, "colors must be convertible to an array: %p for %s" % [colors, name]
    else
      colors = ary
    end
  end

  case colors[0]
  when Array
    unless colors.all? {|a| a.length == 2 }
      raise ArgumentError, "colors array has invalid items" 
    end
    vals, colors = colors.transpose
  else
    vals = Utils.linspace(0r, 1r, colors.length)
  end

  r, g, b, a = colors.map { |c|
    Utils.make_color(c).to_rgba.components
  }.transpose

  segmented_data = {
    red:   [vals, r, r].transpose,
    green: [vals, g, g].transpose,
    blue:  [vals, b, b].transpose,
    alpha: [vals, a, a].transpose
  }

  new(name, segmented_data, n_colors: n_colors, gamma: gamma)
end