Module: SparklinesHelper

Defined in:
lib/sparklines_helper.rb

Overview

Provides a tag for embedding sparklines graphs into your Rails app.

Instance Method Summary collapse

Instance Method Details

#sparkline_tag(results = [], options = {}) ⇒ Object

You can also pass :class => ‘some_css_class’ (‘sparkline’ by default).



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# File 'lib/sparklines_helper.rb', line 11

def sparkline_tag(results=[], options={})		
   url = { :controller => 'sparklines' }
   url[:results] = results.join(',') unless results.nil?
	options = url.merge(options)
   attributes = %(class="#{options[:class] || 'sparkline'}" alt="Sparkline Graph" )
   attributes << %(title="#{options[:title]}" ) if options[:title]

   # prefer to use a "data" URL scheme as described in {RFC 2397}[http://www.ietf.org/rfc/rfc2397.txt]
#     data_url = "data:image/png;base64,#{Base64.encode64(Sparklines.plot(results,options))}"
#     tag = %(<img src="#{data_url}" #{attributes}/>)

#     # respect some limits noted in RFC 2397 since the data: url is supposed to be 'short'
#     data_url.length <= 1024 && tag.length <= 2100 ? tag :
     %(<img src="#{ url_for options }" #{attributes}/>)
	
end