Module: Mathcha::MathchaHelper

Defined in:
lib/mathcha/mathcha_helper.rb

Overview

Helper included in ActionView::Base. Use mathcha_tag in your views to generate a quick and - at this point - incredibly simple - arithmetic problem for your end user to validate.

Coming soon:

  • Support for floats and precision.

  • Multiple active mathchas per session.

  • Override default session key.

  • Suppport for negative values if users so wish.

Constant Summary collapse

ADD =

For some reason I thought this may make the code look a little cleaner in the switch. Work with me.

'+'
SUB = 
'-'
DIV = 
'/'
SOLV_OPS = 
[ADD, SUB, DIV]

Instance Method Summary collapse

Instance Method Details

#mathcha_tag(options = {}) ⇒ Object

Use mathcha_tag to generate a simple mathcha - dead simple math problems. How crazy you get with your seeds is solely at your discretion - cater to you audience.

  • All solutions are positive integers.

  • All problems generated by mathcha present positive integers to the end-user.

Other bits:

  • Pass html options as such => {:class => ‘foo’}

  • The default session key for this thing is :solv, I’d suggest you leave it be.

  • Only one mathcha can exist at a time, for now.



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# File 'lib/mathcha/mathcha_helper.rb', line 37

def mathcha_tag(options={})
  solv_key = Time.now.to_i     
  seed_one = options[:one] || 300
  seed_two = options[:two] || 100

  result = nil
  
  while result.nil? or !result.is_a?(Integer) or result < 0
    result, eq, eq_slick = generate_solv(SOLV_OPS[rand(SOLV_OPS.size)], seed_one, seed_two)
  end 

  # Here we bury away the equation.
  session[:solv] = [solv_key, eval(eq)]
  
  if options[:html]
    html_options = options[:html].inject([]){|dump, pair| dump << "#{pair[0]}=\"#{pair[1]}\""}
    html_options.join(" ")
  end
  
  html = ''
  html << %{#{eq_slick.titlecase} = <input type="text" name="solv" #{html_options} />\n}
  html << %{<input type="hidden" name="solv_key" value="#{solv_key}" />\n}
  html
end