SVG::Graph

Base object for generating SVG Graphs

Synopsis

  module SVG::Graph::Graph_Type
    include SVG::Graph

    def set_defaults
      default = { 'keys' => 'value }
      default.each { |key, value|
        this.config[ key ] = value
      }
    end

    def get_template
      template = 'set the template'
      return template
    end

    def _init
      # any testing you want to do
    end
  end

In your script…

  require 'SVG/Graph/Graph_Type'

  width = 500
  height = 300
  fields = %w{ field_1 field_2 field_3 )

  graph = SVG::Graph::Graph_Type.new( {
    :fields => fields,
    # ... other config options
    :height => height
  })

  data = [ 23, 56, 32 ]

  graph.add_data( {
    :data => data,
    :title => 'Sales 2002'
  })

  config_value = graph.config_option
  graph.config_option = config_value

  graph.compress = true

  print "Content-type: image/svg+xml\r\n"
  print graph.burn

Description

This package should be used as a base for creating SVG graphs.

See SVG::Graph::Bar for an example.

This method allows you do add data to the graph object. It can be called several times to add more data sets in.

  data_sales_02 = [12, 45, 21];

  graph.add_data({
    :data => data_sales_02,
    :title => 'Sales 2002'
  })

This method removes all data from the object so that you can reuse it to create a new graph but with the same config options.

  graph.clear_data

This method processes the template with the data and config which has been set and returns the resulting SVG.

This method will croak unless at least one data set has been added to the graph object.

  print graph.burn

Calculate a scaling range and divisions to be aesthetically pleasing

Returns true if config value exists, is defined and not ’’