Class: AutoQCMRenderer

Inherits:
Object
  • Object
show all
Includes:
TexOutput
Defined in:
lib/ruql/renderers/auto_qcm_renderer.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from TexOutput

#add_newlines, #to_tex

Constructor Details

#initialize(quiz, options = {}) ⇒ AutoQCMRenderer

Returns a new instance of AutoQCMRenderer.



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 8

def initialize(quiz, options={})
  @output = ''
  @quiz = quiz
  @template = options.delete('t') ||
    options.delete('template') ||
    File.join(Gem.loaded_specs['ruql'].full_gem_path, 'templates/autoqcm.tex.erb')
  @penalty = (options.delete('p') || options.delete('penalty') || '0').to_f
  @show_solutions = options.delete('s') || options.delete('solutions')
  
end

Instance Attribute Details

#output ⇒ Object (readonly)

Returns the value of attribute output.



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 6

def output
  @output
end

Instance Method Details

#render(question, index, type = '') ⇒ Object 



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 53

def render(question, index, type='')    
  output = ''
  output << "\\begin{question#{type}}{q#{index}}\n"
  output << "  \\scoring{b=#{question.points},m=#{@penalty*question.points}}\n"
  if type == 'mult'
    question.question_text = "Select ALL that apply. " + question.question_text
  elsif type == ''
    question.question_text = "Choose ONE answer. " + question.question_text
  end
  output << "  " << to_tex(question.question_text) << "\n"

  # answers - ignore randomization

  output << "  \\begin{choices}\n"
  question.answers.each do |answer|
    answer_text = to_tex(answer.answer_text)
    answer_type = if answer.correct? then 'correct' else 'wrong' end
    output << "    \\#{answer_type}choice{#{answer_text}}\n"
    if @show_solutions and answer.explanation
      explanation = to_tex(answer.explanation)
      if answer_type == 'wrong'
        output << "{\\color{red}\\tab #{explanation}}"
      else
        output << "{\\color[rgb]{0,.5,0}\\tab #{explanation}}"
      end
    end
  end
  output << "  \\end{choices}\n"
  output << "\\end{question#{type}}\n\n"
  output
end

#render_question(q, index) ⇒ Object 



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 37

def render_question(q,index)
  case q
  when SelectMultiple,TrueFalse then render(q, index, 'mult') # These are subclasses of MultipleChoice, should go first
  when MultipleChoice then render(q, index)
  else
    @quiz.logger.error "Question #{index} (#{q.question_text[0,15]}...): AutoQCM can only handle multiple_choice, truefalse, or select_multiple questions"
    ''
  end
end

#render_quiz ⇒ Object 



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 19

def render_quiz
  quiz = @quiz                # make quiz object available in template's scope
  with_erb_template(IO.read(File.expand_path @template)) do
    output = ''
    render_random_seed
    @quiz.questions.each_with_index do |q,i|
      next_question = render_question q,i
      output << next_question
    end
    output
  end
end

#render_random_seed ⇒ Object 



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 47

def render_random_seed
  seed = @quiz.seed
  @output << "\n%% Random seed: #{seed}\n"
  @output << "\\AMCrandomseed{#{seed}}\n\n"
end

#with_erb_template(template) ⇒ Object 



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# File 'lib/ruql/renderers/auto_qcm_renderer.rb', line 32

def with_erb_template(template)
  # template will 'yield' back to render_quiz to render the questions
  @output = ERB.new(template).result(binding)
end