Class: AsciiArt

Inherits:
Object
  • Object
show all
Defined in:
lib/asciiart.rb,
lib/asciiart/version.rb

Constant Summary collapse

VERSION = 
"0.0.9"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(path_to_file) ⇒ AsciiArt

Returns a new instance of AsciiArt.



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# File 'lib/asciiart.rb', line 11

def initialize(path_to_file)
  # open-uri open will fallback to IO open
  open(path_to_file) { |file| @data = file.read }
  self
end

Instance Attribute Details

#image_chars ⇒ Object 



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# File 'lib/asciiart.rb', line 71

def image_chars
  @image_chars ||= ' .~:+=o*x^%#@$MW'.chars.to_a
end

Instance Method Details

#inspect ⇒ Object 



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# File 'lib/asciiart.rb', line 75

def inspect
  "#<#{self.class.to_s}>"
end

#to_ascii_art(options = {}) ⇒ Object 



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# File 'lib/asciiart.rb', line 17

def to_ascii_art(options = {})
  options = { width: 100, color: false, format: "text" }.merge(options)

  img = Magick::Image.from_blob(@data).first

  width       = options[:width]
  scale       = (width.to_f / img.columns)
  height      = ((img.rows * scale) / 2).to_i

  img.resize!(width, height)
  color_image   = img.dup if options[:color]
  img           = img.quantize(image_chars.length, Magick::GRAYColorspace).normalize
  quantum_calc  = Magick::QuantumRange / Magick::QuantumPixel.to_i
  image_chars.map! {|char| char == " " ? "&nbsp;" : char } if options[:format] == "html"

  border = "+#{'-' * width}+#{line_break(options[:format])}"
  border = html_char(border) if options[:format] == "html"

  output = border.dup

  img.view(0, 0, width, height) do |view|
    height.times do |i|
      output << '|'
      width.times do |j|

        character = image_chars[view[i][j].red/quantum_calc]

        if options[:format] == "html"
          if (options[:color])

            pix = color_image.pixel_color(j,i)
            color_string = "color: #{pix.to_color( Magick::AllCompliance,false,8, true)};"
          else
            color_string = ""
          end
          character = html_char(character, color_string)
        else
          # text-format
          if options[:color]
            pix       = color_image.pixel_color(j,i)
            character = character.color(unified_rgb_value(pix.red), unified_rgb_value(pix.green), unified_rgb_value(pix.blue))
          end
        end

        output << character
      end

      output << "|#{line_break(options[:format])}"
    end
  end

  output + border
end