Class: Kamcaptcha::Generator

Inherits:
Object
  • Object
show all
Defined in:
lib/kamcaptcha/generator.rb

Defined Under Namespace

Classes: DictionaryWordGenerator, RandomWordGenerator, WordGenerator

Constant Summary collapse

DEFAULTS = 
{
  :width  => 240,
  :height => 50,
  :length => 5,
  :format => "png",
  :count  => 1
}

Class Method Summary collapse

Class Method Details

.build_image(word, width, height) ⇒ Object 



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# File 'lib/kamcaptcha/generator.rb', line 104

def self.build_image(word, width, height)
  text_img  = Magick::Image.new(width, height)
  black_img = Magick::Image.new(width, height) do
    self.background_color = "black"
  end

  text_img.annotate(Magick::Draw.new, 0, 0, 0, 0, word) do
    self.gravity      = Magick::WestGravity
    self.font_family  = "Verdana"
    self.font_weight  = Magick::BoldWeight
    self.fill         = "#666666"
    self.stroke       = "black"
    self.stroke_width = 2
    self.pointsize    = 44
  end

  # Apply a little blur and fuzzing
  text_img        = text_img.gaussian_blur(1.2, 1.2)
  text_img        = text_img.sketch(20, 30.0, 30.0)
  text_img        = text_img.wave(3, 90)

  # Now we need to get the white out
  text_mask       = text_img.negate
  text_mask.matte = false

  # Add cut-out our captcha from the black image with varying tranparency
  black_img.composite!(text_mask, Magick::CenterGravity, Magick::CopyOpacityCompositeOp)

  text_img.destroy!
  text_mask.destroy!

  black_img
end

.generate(path, options = {}) ⇒ Object 



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# File 'lib/kamcaptcha/generator.rb', line 78

def self.generate(path, options = {})
  options = DEFAULTS.merge(options)

  if options[:source] != "random"
    source = DictionaryWordGenerator.new(options[:length])
  else
    source = RandomWordGenerator.new(options[:length])
  end

  files = []

  options[:count].times do
    word  = source.generate
    image = build_image(word, options[:width], options[:height])
    name  = word.delete(" ").downcase
    file  = File.join(path, Kamcaptcha.encrypt(name) + ".#{options[:format]}")

    image.write(file)
    image.destroy!

    files << file
  end

  files
end