Class: Prawn::SVG::Color

Inherits:

Object

• Object
• Prawn::SVG::Color

Defined in:

lib/prawn/svg/color.rb

Defined Under Namespace

Classes: CMYK, RGB

Constant Summary

RGB_DEFAULT_COLOR =

RGB.new("000000")

CMYK_DEFAULT_COLOR =

CMYK.new([0, 0, 0, 100])

HTML_COLORS =

{
  'aliceblue' => 'f0f8ff',
  'antiquewhite' => 'faebd7',
  'aqua' => '00ffff',
  'aquamarine' => '7fffd4',
  'azure' => 'f0ffff',
  'beige' => 'f5f5dc',
  'bisque' => 'ffe4c4',
  'black' => '000000',
  'blanchedalmond' => 'ffebcd',
  'blue' => '0000ff',
  'blueviolet' => '8a2be2',
  'brown' => 'a52a2a',
  'burlywood' => 'deb887',
  'cadetblue' => '5f9ea0',
  'chartreuse' => '7fff00',
  'chocolate' => 'd2691e',
  'coral' => 'ff7f50',
  'cornflowerblue' => '6495ed',
  'cornsilk' => 'fff8dc',
  'crimson' => 'dc143c',
  'cyan' => '00ffff',
  'darkblue' => '00008b',
  'darkcyan' => '008b8b',
  'darkgoldenrod' => 'b8860b',
  'darkgray' => 'a9a9a9',
  'darkgreen' => '006400',
  'darkgrey' => 'a9a9a9',
  'darkkhaki' => 'bdb76b',
  'darkmagenta' => '8b008b',
  'darkolivegreen' => '556b2f',
  'darkorange' => 'ff8c00',
  'darkorchid' => '9932cc',
  'darkred' => '8b0000',
  'darksalmon' => 'e9967a',
  'darkseagreen' => '8fbc8f',
  'darkslateblue' => '483d8b',
  'darkslategray' => '2f4f4f',
  'darkslategrey' => '2f4f4f',
  'darkturquoise' => '00ced1',
  'darkviolet' => '9400d3',
  'deeppink' => 'ff1493',
  'deepskyblue' => '00bfff',
  'dimgray' => '696969',
  'dimgrey' => '696969',
  'dodgerblue' => '1e90ff',
  'firebrick' => 'b22222',
  'floralwhite' => 'fffaf0',
  'forestgreen' => '228b22',
  'fuchsia' => 'ff00ff',
  'gainsboro' => 'dcdcdc',
  'ghostwhite' => 'f8f8ff',
  'gold' => 'ffd700',
  'goldenrod' => 'daa520',
  'gray' => '808080',
  'grey' => '808080',
  'green' => '008000',
  'greenyellow' => 'adff2f',
  'honeydew' => 'f0fff0',
  'hotpink' => 'ff69b4',
  'indianred' => 'cd5c5c',
  'indigo' => '4b0082',
  'ivory' => 'fffff0',
  'khaki' => 'f0e68c',
  'lavender' => 'e6e6fa',
  'lavenderblush' => 'fff0f5',
  'lawngreen' => '7cfc00',
  'lemonchiffon' => 'fffacd',
  'lightblue' => 'add8e6',
  'lightcoral' => 'f08080',
  'lightcyan' => 'e0ffff',
  'lightgoldenrodyellow' => 'fafad2',
  'lightgray' => 'd3d3d3',
  'lightgreen' => '90ee90',
  'lightgrey' => 'd3d3d3',
  'lightpink' => 'ffb6c1',
  'lightsalmon' => 'ffa07a',
  'lightseagreen' => '20b2aa',
  'lightskyblue' => '87cefa',
  'lightslategray' => '778899',
  'lightslategrey' => '778899',
  'lightsteelblue' => 'b0c4de',
  'lightyellow' => 'ffffe0',
  'lime' => '00ff00',
  'limegreen' => '32cd32',
  'linen' => 'faf0e6',
  'magenta' => 'ff00ff',
  'maroon' => '800000',
  'mediumaquamarine' => '66cdaa',
  'mediumblue' => '0000cd',
  'mediumorchid' => 'ba55d3',
  'mediumpurple' => '9370db',
  'mediumseagreen' => '3cb371',
  'mediumslateblue' => '7b68ee',
  'mediumspringgreen' => '00fa9a',
  'mediumturquoise' => '48d1cc',
  'mediumvioletred' => 'c71585',
  'midnightblue' => '191970',
  'mintcream' => 'f5fffa',
  'mistyrose' => 'ffe4e1',
  'moccasin' => 'ffe4b5',
  'navajowhite' => 'ffdead',
  'navy' => '000080',
  'oldlace' => 'fdf5e6',
  'olive' => '808000',
  'olivedrab' => '6b8e23',
  'orange' => 'ffa500',
  'orangered' => 'ff4500',
  'orchid' => 'da70d6',
  'palegoldenrod' => 'eee8aa',
  'palegreen' => '98fb98',
  'paleturquoise' => 'afeeee',
  'palevioletred' => 'db7093',
  'papayawhip' => 'ffefd5',
  'peachpuff' => 'ffdab9',
  'peru' => 'cd853f',
  'pink' => 'ffc0cb',
  'plum' => 'dda0dd',
  'powderblue' => 'b0e0e6',
  'purple' => '800080',
  'red' => 'ff0000',
  'rosybrown' => 'bc8f8f',
  'royalblue' => '4169e1',
  'saddlebrown' => '8b4513',
  'salmon' => 'fa8072',
  'sandybrown' => 'f4a460',
  'seagreen' => '2e8b57',
  'seashell' => 'fff5ee',
  'sienna' => 'a0522d',
  'silver' => 'c0c0c0',
  'skyblue' => '87ceeb',
  'slateblue' => '6a5acd',
  'slategray' => '708090',
  'slategrey' => '708090',
  'snow' => 'fffafa',
  'springgreen' => '00ff7f',
  'steelblue' => '4682b4',
  'tan' => 'd2b48c',
  'teal' => '008080',
  'thistle' => 'd8bfd8',
  'tomato' => 'ff6347',
  'turquoise' => '40e0d0',
  'violet' => 'ee82ee',
  'wheat' => 'f5deb3',
  'white' => 'ffffff',
  'whitesmoke' => 'f5f5f5',
  'yellow' => 'ffff00',
  'yellowgreen' => '9acd32'
}.freeze

VALUE_REGEXP =

"\s*(-?[0-9.]+%?)\s*"

RGB_REGEXP =

/\Argb\(#{VALUE_REGEXP},#{VALUE_REGEXP},#{VALUE_REGEXP}\)\z/i

CMYK_REGEXP =

/\Adevice-cmyk\(#{VALUE_REGEXP},#{VALUE_REGEXP},#{VALUE_REGEXP},#{VALUE_REGEXP}\)\z/i

URL_REGEXP =

/\Aurl\(([^)]*)\)\z/i

Class Method Summary

• .css_color_to_prawn_color(color) ⇒ Object
• .parse(color_string, gradients = nil, color_mode = :rgb) ⇒ Object

Class Method Details

.css_color_to_prawn_color(color) ⇒ Object

# File 'lib/prawn/svg/color.rb', line 213

def self.css_color_to_prawn_color(color)
  result = parse(color).detect {|result| result.is_a?(RGB) || result.is_a?(CMYK)}
  result.value if result
end

.parse(color_string, gradients = nil, color_mode = :rgb) ⇒ Object

# File 'lib/prawn/svg/color.rb', line 163

def self.parse(color_string, gradients = nil, color_mode = :rgb)
  url_specified = false

  components = color_string.to_s.strip.scan(/([^(\s]+(\([^)]*\))?)/)

  result = components.map do |color, *_|
    if m = color.match(/\A#([0-9a-f])([0-9a-f])([0-9a-f])\z/i)
      RGB.new("#{m[1] * 2}#{m[2] * 2}#{m[3] * 2}")

    elsif color.match(/\A#[0-9a-f]{6}\z/i)
      RGB.new(color[1..6])

    elsif hex = HTML_COLORS[color.downcase]
      hex_color(hex, color_mode)

    elsif m = color.match(RGB_REGEXP)
      hex = (1..3).collect do |n|
        value = m[n].to_f
        value *= 2.55 if m[n][-1..-1] == '%'
        "%02x" % clamp(value.round, 0, 255)
      end.join

      RGB.new(hex)

    elsif m = color.match(CMYK_REGEXP)
      cmyk = (1..4).collect do |n|
        value = m[n].to_f
        value *= 100 unless m[n][-1..-1] == '%'
        clamp(value, 0, 100)
      end

      CMYK.new(cmyk)

    elsif matches = color.match(URL_REGEXP)
      url_specified = true
      url = matches[1]
      if url[0] == "#" && gradients && gradient = gradients[url[1..-1]]
        gradient
      end
    end
  end

  # Generally, we default to black if the colour was unparseable.
  # http://www.w3.org/TR/SVG/painting.html section 11.2 says if a URL was
  # supplied without a fallback, that's an error.
  result << default_color(color_mode) unless url_specified

  result.compact
end