Class: GoogleChart::LineChart

Inherits:
Base
  • Object
show all
Defined in:
lib/google_chart/line_chart.rb

Overview

Generates a Line Chart. You can specify whether it is a standard line chart or an XY Line chart

Examples

# Line Chart
lc = GoogleChart::LineChart.new('320x200', "Line Chart", false)
lc.data "Trend 1", [5,4,3,1,3,5,6], '0000ff'
lc.data "Trend 2", [1,2,3,4,5,6], '00ff00'
lc.data "Trend 3", [6,5,4,3,2,1], 'ff0000'
puts lc.to_url

# Line XY Chart
lcxy =  GoogleChart::LineChart.new('320x200', "Line XY Chart", true)
lcxy.data "Trend 1", [[1,1], [2,2], [3,3], [4,4]], '0000ff'
lcxy.data "Trend 2", [[4,5], [2,2], [1,1], [3,4]], '00ff00'
puts lcxy.to_url

Constant Summary

Constants inherited from Base

Base::BASE_URL, Base::COMPLEX_ENCODING_ALPHABET, Base::SIMPLE_ENCODING

Instance Attribute Summary collapse

Attributes inherited from Base

#chart_size, #chart_title, #chart_type, #data_encoding, #params, #show_labels, #show_legend

Instance Method Summary collapse

Methods inherited from Base

#axis, #data, #fill, #grid, #to_url

Constructor Details

#initialize(chart_size = '300x200', chart_title = nil, is_xy = false) ⇒ LineChart

Initializes a Line Chart object with a chart_size and chart_title. Specify is_xy as true to generate a Line XY chart



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# File 'lib/google_chart/line_chart.rb', line 23

def initialize(chart_size='300x200', chart_title=nil, is_xy=false)
    super(chart_size, chart_title)
    self.is_xy = is_xy
end

Instance Attribute Details

#is_xy ⇒ Object

Returns the value of attribute is_xy.



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# File 'lib/google_chart/line_chart.rb', line 20

def is_xy
  @is_xy
end

Instance Method Details

#process_data ⇒ Object 



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# File 'lib/google_chart/line_chart.rb', line 44

def process_data
    if self.is_xy or @data.size > 1
        if self.is_xy # XY Line graph data series
          max_value = @data.flatten.max
         x_data = @data.collect do |series|
             series.collect { |val| val.first }
         end
         
         y_data = @data.collect do |series|
              series.collect { |val| val.last }
         end
          
          encoded_data = []
          @data.size.times { |i|
              # Interleave X and Y co-ordinate data
              encoded_data << join_encoded_data([encode_data(x_data[i],max_value), encode_data(y_data[i],max_value)])
          }
          join_encoded_data(encoded_data)
        else # Line graph multiple data series
          max_value = @data.flatten.max
          join_encoded_data(@data.collect { |series|
            encode_data(series, max_value)
          })
        end
    else
        encode_data(@data.flatten)
    end
end