Module: Sinatra::ChartTopper

Defined in:
lib/sinatra/chart_topper.rb

Constant Summary collapse

GRAPH_TYPES =

These graph types are available as top level methods and proxied through to draw() e.g. graph_type() -> draw(Gruff::GraphType)

[:accumulator_bar, :area, :bar, :bar_conversion, :dot, :line, 
:pie, :side_stacked_bar, :side_bar, :spider, :stacked_area, :stacked_bar]
GRAPH_DELEGATIONS =

Delegate(?) these methods to the graph

[:data, :add_color, :theme_37signals, :theme_greyscale, 
:theme_keynote, :theme_odeo, :theme_pastel, :theme_rails_keynote]

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.registered(app) ⇒ Object 



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# File 'lib/sinatra/chart_topper.rb', line 60

def self.registered(app)
  app.helpers Sinatra::ChartTopper
end

Instance Method Details

#draw(type, title, options = {}, &block) ⇒ Object

Define a route to draw a particualar graph



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# File 'lib/sinatra/chart_topper.rb', line 65

def draw(type, title, options = {}, &block)

  prefix = options[:prefix] || "/"
  
  get "#{prefix}#{filename(title)}.png" do
    content_type "image/png"                
    set_graph type.new
    instance_eval(&block)
    graph.title = title
    graph.to_blob
  end

end

#filename(title) ⇒ Object

Make filename from title



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# File 'lib/sinatra/chart_topper.rb', line 40

def filename(title)
  title.gsub(/[^a-zA-Z0-9_\s]/, '').gsub(/\s/, '_').downcase
end

#graph(size = nil) ⇒ Object

Create / return graph object



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# File 'lib/sinatra/chart_topper.rb', line 51

def graph(size = nil)
  @graph
end

#set_graph(graph) ⇒ Object

Set the graph object



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# File 'lib/sinatra/chart_topper.rb', line 56

def set_graph(graph)
  @graph = graph
end

#size(dimensions) ⇒ Object

Create graph of size (reset’s any previous graph!)



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# File 'lib/sinatra/chart_topper.rb', line 45

def size(dimensions)
  type = graph.class
  set_graph type.new(dimensions)
end