Class: JfreechartChart

Inherits:
BaseChart show all
Defined in:
lib/libisi/chart/jfreechart.rb

Constant Summary

Constants inherited from BaseChart

BaseChart::BAR_TYPES, BaseChart::DEFAULT_CHART_TYPE, BaseChart::DEFAULT_HEIGHT, BaseChart::DEFAULT_LEGEND_CHART_RATIO, BaseChart::DEFAULT_LEGEND_ROTATION, BaseChart::DEFAULT_STACKED, BaseChart::DEFAULT_WIDTH

Instance Attribute Summary

Attributes inherited from BaseChart

#height, #legend_chart_ratio, #legend_rotation, #stacked, #title, #type, #width

Instance Method Summary collapse

Methods inherited from BaseChart

#create_chart, #create_combined_plot, #create_plot, #data_dimension, #display_legend, #enable_tooltips, #enable_urls, #initialize, #load, #mark, #orientation, #range, #ranges, #save, #serie, #time_span, #value, #xaxis, #xaxis=, #yaxis, #yaxis=, #zaxis, #zaxis=

Constructor Details

This class inherits a constructor from BaseChart

Instance Method Details

#data(mime_type, options = {}) ⇒ Object 



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# File 'lib/libisi/chart/jfreechart.rb', line 108

def data(mime_type, options = {})
  raise "No chart defined" unless @chart

  temp_file {|temp_image_file|
    info = ChartRenderingInfo.new(StandardEntityCollection.new)
    ChartUtilities.saveChartAsPNG(JFile.new(temp_image_file.to_s),
		      @chart, width.to_i, height.to_i, info);
    
    case mime_type
    when "image/png"
	temp_image_file.open("r").read
    when "text/html"
	image_file = nil
	image_file = Pathname.new(options[:image_file]) if
 image_file.nil? and options[:image_file]
	image_file = Pathname.new(image_path) + "jfreechart.png" if 
 image_file.nil? and options[:image_path]

	image_map_file = nil
	image_map_file = Pathname.new(option[:image_map_file]) if
 image_map_file.nil? and options[:image_map_file]
	
	image_map_file.open("w") {|f|
 f.write(ChartUtilities.getImageMap("chart", info))
	} if image_map_file
	
	
	html_file = StringIO.new      
	# write an HTML page incorporating the image with an image map
	if options[:layout].nil? or !options[:layout]
 html_file.write("<HEAD><TITLE>JFreeChart Image Map</TITLE></HEAD>\n")
 html_file.write("<BODY>\n");
	end
	html_file.write(ChartUtilities.getImageMap("chart", info));

	if image_file
 FileUtils.mv(temp_image_file, image_file)
 html_file.write("<IMG SRC=\"#{image_file.to_s}\" " +
	  "WIDTH=\"#{width}\" HEIGHT=\"#{height}\" BORDER=\"0\" USEMAP=\"#chart\">\n")
	else
 image_data = Base64.encode64(temp_image_file.open("r").read)
 html_file.write("<IMG SRC=\"data:image/png;base64,#{image_data}\" " +
	  "WIDTH=\"#{width}\" HEIGHT=\"#{height}\" BORDER=\"0\" USEMAP=\"#chart\">\n")	  
	end
	if options[:layout].nil? or !options[:layout]
 html_file.write("</BODY>\n");
 html_file.write("</HTML>\n");
	end
	html_file.string
    else
	raise "Cannot render to #{mime_type.inspect}"
    end   
  }
end