Method: TDriverReportDataPresentation#create_graph_image

Defined in:
lib/tdriver/report/report_data_presentation.rb

#create_graph_image(data, filename, title = nil) ⇒ Object

This method will create a .png image with a graph Arguments

data

Hash: Data to be ploted in the form of => [ value 1, value 2, .., value n] , …

filename

String: filname for the image that will be generated. Should have .png extension

title

String: Title for the graph

Returns String: String with the <img> tag to be inserted into an html file Exceptions ArgumentError: Thown when data or filname provided are either nil or the wrong types



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# File 'lib/tdriver/report/report_data_presentation.rb', line 34

def create_graph_image( data, filename, title = nil)
	begin
		require 'gruff'
	rescue Exception => e
		puts "Can't load the Gruff gem. If its missing from your system please run 'gem install gruff' to install it."
		puts e.inspect
	end
	begin
    
		raise TypeError, "ERROR create_graph_image: Data argument is either nil or not a Hash" if ( data.nil? or !data.kind_of? Hash )

		raise ArgumentError, "ERROR create_graph_image: Values of the data Hash need to be arrays of minimum length 2" if ( !data.values[0].kind_of? Array or data.values[0].length < 2 )

		raise TypeError, "ERROR create_graph_image: Filename argument is either missing or not a String" if ( filename.nil? or !filename.kind_of? String )

		g = Gruff::Line.new
		g.title = title unless title.nil?
		data.each_key do |signal|
			g.data( signal, data[signal])
		end
		# boring labels for now
		#data[data.keys[0]].length.times do |i|
		#	g.labels[i] = (i + 1).to_s
		#end
		g.write(filename)
	rescue ArgumentError => e
		puts e.message
	end
end