Module: Aritcaptcha::AritcaptchaHelper

Defined in:
lib/aritcaptcha/aritcaptcha_helper.rb

Constant Summary collapse

ADD = 
'+'
SUB = 
'-'
DIV = 
'/'
MUL = 
'*'
OPERATIONS = 
[ADD, SUB, DIV, MUL]

Instance Method Summary collapse

Instance Method Details

#aritcaptcha_tag(options = {}) ⇒ Object 



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# File 'lib/aritcaptcha/aritcaptcha_helper.rb', line 15

def aritcaptcha_tag(options={})
  equation_key = Time.now.to_i

  default_operations = {:add => "+", :sub => "-", :mul => "*", :div => "/"}

  operator = nil
  if options[:operations] == nil
     operator = default_operations.to_a[rand(default_operations.size)][1]
  else
     non_default_operations = {}
     options[:operations].each do |op|
        non_default_operations[op] = default_operations[op]
     end
    operator = non_default_operations.to_a[rand(non_default_operations.size)][1]
  end

  equation, result = Aritcaptcha::Calculation.generate_calculation 50, 50, operator

  session[:equation] = [equation_key, eval(equation)]

  if options[:html]
    options_html = options[:html].inject([]) { |dump, pair| dump << "#{pair[0]}=\"#{pair[1]}\"" }
    options_html = options_html.join(" ")
  end

  html = ""
  if options[:format] == "image"
  	 session[:image] = equation_key
     img = generate_image equation_key, equation

     html << "<img src=\"/images/#{img}\" style='vertical-align:top;' /> <input type=\"text\" name=\"equation\" size=\"3\" style='vertical-align:top;' #{options_html unless options_html.nil?} />"
  else
  	html << "#{equation} = <input type=\"text\" name=\"equation\" style='vertical-align:top;' size=\"3\" #{options_html unless options_html.nil?} /></div>"
  end

  html << "<input type=\"hidden\" name=\"equation_key\" value=\"#{equation_key}\" /> \n"
end

#generate_image(equation_key, equation) ⇒ Object 



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# File 'lib/aritcaptcha/aritcaptcha_helper.rb', line 53

def generate_image(equation_key, equation)
  relative_name = "equacao-#{equation_key}.png"
  full_path     = "#{Rails.root}/public/images/#{relative_name}"

  unless File.file?(full_path)
     image = Magick::Image.new(85, 32)
     image.format = "PNG"
     title = Magick::Draw.new
 
     title.annotate(image, 5, 5, 12, 7, equation + " =") do
       self.fill        = "#333"
       self.font        = Rails.root + "/fonts/Clarenton LT Bold.ttf"
       self.font_family = "Clarenton LT Bold"
       self.font_weight = Magick::BoldWeight
       self.gravity     = Magick::NorthWestGravity
       self.pointsize   = 15
     end
     image.write(full_path)
  end      
   relative_name
end