Class: EasyCaptcha::Generator::Default

Inherits:
Base
  • Object
show all
Defined in:
lib/easy_captcha/generator/default.rb

Overview

default generator

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Base

#initialize

Constructor Details

This class inherits a constructor from EasyCaptcha::Generator::Base

Instance Attribute Details

#background_image ⇒ Object

Background



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# File 'lib/easy_captcha/generator/default.rb', line 33

def background_image
  @background_image
end

#blur ⇒ Object

Gaussian Blur



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# File 'lib/easy_captcha/generator/default.rb', line 45

def blur
  @blur
end

#blur_radius ⇒ Object

Gaussian Blur



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# File 'lib/easy_captcha/generator/default.rb', line 45

def blur_radius
  @blur_radius
end

#blur_sigma ⇒ Object

Gaussian Blur



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# File 'lib/easy_captcha/generator/default.rb', line 45

def blur_sigma
  @blur_sigma
end

#font ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font
  @font
end

#font_family ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font_family
  @font_family
end

#font_fill_color ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font_fill_color
  @font_fill_color
end

#font_size ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font_size
  @font_size
end

#font_stroke ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font_stroke
  @font_stroke
end

#font_stroke_color ⇒ Object

Font



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# File 'lib/easy_captcha/generator/default.rb', line 30

def font_stroke_color
  @font_stroke_color
end

#image_background_color ⇒ Object

Background



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# File 'lib/easy_captcha/generator/default.rb', line 33

def image_background_color
  @image_background_color
end

#implode ⇒ Object

Implode



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# File 'lib/easy_captcha/generator/default.rb', line 42

def implode
  @implode
end

#sketch ⇒ Object

Sketch



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# File 'lib/easy_captcha/generator/default.rb', line 36

def sketch
  @sketch
end

#sketch_radius ⇒ Object

Sketch



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# File 'lib/easy_captcha/generator/default.rb', line 36

def sketch_radius
  @sketch_radius
end

#sketch_sigma ⇒ Object

Sketch



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# File 'lib/easy_captcha/generator/default.rb', line 36

def sketch_sigma
  @sketch_sigma
end

#wave ⇒ Object

Wave



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# File 'lib/easy_captcha/generator/default.rb', line 39

def wave
  @wave
end

#wave_amplitude ⇒ Object

Wave



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# File 'lib/easy_captcha/generator/default.rb', line 39

def wave_amplitude
  @wave_amplitude
end

#wave_length ⇒ Object

Wave



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# File 'lib/easy_captcha/generator/default.rb', line 39

def wave_length
  @wave_length
end

Instance Method Details

#blur? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/easy_captcha/generator/default.rb', line 55

def blur? #:nodoc:
  @blur
end

#defaults ⇒ Object

set default values



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# File 'lib/easy_captcha/generator/default.rb', line 10

def defaults
  @font_size              = 24
  @font_fill_color        = '#333333'
  @font                   = File.expand_path('../../../../resources/captcha.ttf', __FILE__)
  @font_stroke            = '#000000'
  @font_stroke_color      = 0
  @image_background_color = '#FFFFFF'
  @sketch                 = true
  @sketch_radius          = 3
  @sketch_sigma           = 1
  @wave                   = true
  @wave_length            = (60..100)
  @wave_amplitude         = (3..5)
  @implode                = 0.05
  @blur                   = true
  @blur_radius            = 1
  @blur_sigma             = 2
end

#generate(code) ⇒ Object

generate image



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# File 'lib/easy_captcha/generator/default.rb', line 60

def generate(code)
  require 'rmagick' unless defined?(Magick)

  config = self
  canvas = Magick::Image.new(EasyCaptcha.image_width, EasyCaptcha.image_height) do |variable|
    self.background_color = config.image_background_color unless config.image_background_color.nil?
    self.background_color = 'none' if config.background_image.present?
  end

  # Render the text in the image
  canvas.annotate(Magick::Draw.new, 0, 0, 0, 0, code) {
    self.gravity     = Magick::CenterGravity
    self.font        = config.font
    self.font_weight = Magick::LighterWeight
    self.fill        = config.font_fill_color
    if config.font_stroke.to_i > 0
      self.stroke       = config.font_stroke_color
      self.stroke_width = config.font_stroke
    end
    self.pointsize = config.font_size
  }

  # Blur
  canvas = canvas.blur_image(config.blur_radius, config.blur_sigma) if config.blur?

  # Wave
  w = config.wave_length
  a = config.wave_amplitude
  canvas = canvas.wave(rand(a.last - a.first) + a.first, rand(w.last - w.first) + w.first) if config.wave?

  # Sketch
  canvas = canvas.sketch(config.sketch_radius, config.sketch_sigma, rand(180)) if config.sketch?

  # Implode
  canvas = canvas.implode(config.implode.to_f) if config.implode.is_a? Float

  # Crop image because to big after waveing
  canvas = canvas.crop(Magick::CenterGravity, EasyCaptcha.image_width, EasyCaptcha.image_height)


  # Combine images if background image is present
  if config.background_image.present?
    background = Magick::Image.read(config.background_image).first
    background.composite!(canvas, Magick::CenterGravity, Magick::OverCompositeOp)

    image = background.to_blob { self.format = 'PNG' }
  else
    image = canvas.to_blob { self.format = 'PNG' }
  end

  # ruby-1.9
  image = image.force_encoding 'UTF-8' if image.respond_to? :force_encoding

  canvas.destroy!
  image
end

#sketch? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/easy_captcha/generator/default.rb', line 47

def sketch? #:nodoc:
  @sketch
end

#wave? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/easy_captcha/generator/default.rb', line 51

def wave? #:nodoc:
  @wave
end