Module: ALaChartHelper

Defined in:
lib/a_la_chart/a_la_chart_helper.rb

Instance Method Summary collapse

Instance Method Details

#chart_options(chart_make, chart_style = nil) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 104

def chart_options(chart_make, chart_style=nil)
  default_options = theme(chart_make)[:default_options] || {}
  options = decode_options(params[:co])
  chart_style_options = (theme(chart_make)[:options] || {})[chart_style] || {}
  default_options.merge(options).merge(chart_style_options)
end

#chart_tag(chart_make, chart_style, args = {}) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 14

def chart_tag(chart_make, chart_style, args={})
  width = args[:width] || 400
  height = args[:height] || 300
  chart_make_version = args[:version]
  name = args[:name] || args[:case] || 'chart'
  url = base_url = args[:base_url] || url_for
  
  chart_make = chart_make.to_sym
  
  chart_make_config = ALaChart::Config[chart_make]
  chart_make_version = chart_make_version || chart_make_config[:default]
  chart_make_config = chart_make_config[chart_make_version.to_sym]
  
  chart_type_config = chart_make_config[chart_style.to_sym]
  raise "#{chart_style.to_s} is an unsupported chart style" if chart_type_config.blank?
  inline_template = chart_type_config[:inline]
  remote_template = chart_type_config[:remote]
  
  template = args[:inline] ? inline_template : remote_template || inline_template
  
  data_format = chart_type_config[:format] || chart_make_config[:format]
  
  append_url = chart_type_config[:url] || ".chart#{data_format}"
  url += "#{append_url}?"
  
  options = args.delete(:options) || {}
  
  explicit_args = args[:args].present? ? params.merge(args[:args]) : params
  args.reject!{ |k,v| [:name,:width,:height,:base_url].include?(k) }
  args.merge!(explicit_args)
  # Can I do this? Or does it make me look like...
  args.reject!{ |k,v| ['action','controller'].include?(k) }
  args[:cm] = chart_make.to_s
  args[:ct] = chart_style.to_s
  # This feels a little too hacky for my taste... try better encoding
  args[:co] = encode_options(options)
  
  url += args.to_param
  
  div_id = "#{name}#{Time.now.to_f.to_s.gsub('.','')}"
  
  data_template_path = chart_type_config[:data]
  data_template = File.join(File.dirname(__FILE__), '..', '..', 'configs', chart_make.to_s, chart_make_version.to_s, data_template_path) if data_template_path.present?
  # If we cannot find the file, try it as a relative path
  data_template = File.join(RAILS_ROOT, data_template_path) if data_template_path.present? && !File.exists?(data_template) && defined?(RAILS_ROOT)
  
  chart_template = File.join(File.dirname(__FILE__), '..', '..', 'configs', chart_make.to_s, chart_make_version.to_s, template)
  # If we cannot find the file, try it as a relative path
  chart_template = File.join(RAILS_ROOT, template) if !File.exists?(chart_template) && defined?(RAILS_ROOT)
  
  chart_template_erb = ERB.new(File.read(chart_template))
  output = chart_template_erb.result(binding)
  
  if ActionView::Base.xss_safe?
    output.html_safe
  else
    output
  end
end

#color_palette(chart_make, chart_style = nil) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 91

def color_palette(chart_make, chart_style=nil)
  theme(chart_make)[:color_palette] || []
end

#color_palette_clear(chart_make, chart_style = nil) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 95

def color_palette_clear(chart_make, chart_style=nil)
  @color_palette_ary = color_palette(chart_make, chart_style).clone
end

#color_palette_next(chart_make, chart_style = nil) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 99

def color_palette_next(chart_make, chart_style=nil)
  @color_palette_ary ||= color_palette(chart_make, chart_style).clone
  @color_palette_ary.pop
end

#decode_options(options_str) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 78

def decode_options(options_str)
  hash = Hash[ *(options_str.to_s.split(/[|~]/)) ]
  converted = {}
  hash.each{|k,v|
    if v && k.class == String && !k.blank?
      converted[CGI::unescape(k).to_sym] = CGI::unescape(v.to_s)
    else
      converted[k] = v
    end
  }
  converted
end

#encode_options(options) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 74

def encode_options(options)
  options.map{|k,v| "#{CGI::escape(k.to_s)}~#{CGI::escape(v.to_s)}"}.join("|")
end

#inline_chart_tag(chart_make, chart_style, args = {}) ⇒ Object 



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# File 'lib/a_la_chart/a_la_chart_helper.rb', line 4

def inline_chart_tag(chart_make, chart_style, args={})
  output = chart_tag(chart_make, chart_style, args.merge(:inline => true))
  
  if ActionView::Base.xss_safe?
    output.html_safe
  else
    output
  end
end