Class: DynamicReports::Charts

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamic_reports/charts.rb

Overview

DynamicReports::Charts

Class used to display different chart types internally.  Charts are generated
using Google Charts API

Class Method Summary collapse

Class Method Details

.bar_column_chart(chart, columns, report, orientation) ⇒ Object

Method to display a bar or column chart for a given chart definition and report



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# File 'lib/dynamic_reports/charts.rb', line 180

def bar_column_chart(chart, columns, report, orientation)
  ::GoogleChart::BarChart.new("#{chart.width}x#{chart.height}", chart.title, orientation, true) do |c|
    all_data = []
    all_labels = []
    columns.each do |column|
      data = []
      report.records.each do |record|
        if record.is_a?(Hash)
          data << record[column] if record[column].is_a?(Numeric)
          all_labels << record[chart.label_column.to_s] if chart.label_column
        elsif record.respond_to?(column.to_sym)
          data << record.send(column.to_sym) if record.send(column.to_sym).is_a?(Numeric)
          all_labels << record.send(chart.label_column.to_s) if chart.label_column
        else
          data << column if column.is_a?(Numeric)
          all_labels << chart.label_column.to_s if chart.label_column
        end
      end
      c.data column, data, random_color() unless data.empty?
      all_data << data
    end
    all_data.flatten!

    if(orientation==:vertical)
      c.axis :y, :range => [all_data.min,all_data.max], :color => 'ff00ff' unless chart.no_labels
    else
      c.axis :x, :range => [all_data.min,all_data.max], :color => 'ff00ff'  unless chart.no_labels
      c.axis :y, :labels => all_labels
    end

    c.show_legend = columns.size > 1

    return c.to_url(chart.options)
  end
end

.line_chart(chart, columns, report) ⇒ Object

Method to display a line chart for a given chart definition and report



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# File 'lib/dynamic_reports/charts.rb', line 132

def line_chart(chart, columns, report)
  ::GoogleChart::LineChart.new("#{chart.width}x#{chart.height}", chart.title, false) do |c|
    all_data = []
    columns.each do |column|
      data = []
      report.records.each do |record|
        if record.is_a?(Hash)
          data << record[column] if record[column].is_a?(Numeric)
        elsif record.respond_to?(column.to_sym)
          data << record.send(column.to_sym) if record.send(column.to_sym).is_a?(Numeric)
        else
          data << column if column.is_a?(Numeric)
        end
      end
      c.data column, data, random_color() unless data.empty?
      all_data << data
    end
    all_data.flatten!
    c.axis :y, :range => [all_data.min,all_data.max], :color => 'ff00ff' unless chart.no_labels
    c.show_legend = columns.size > 1

    return c.to_url(chart.options)
  end
end

.pie_chart(chart, columns, report) ⇒ Object

Method to display a pie chart for a given chart definition and report



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# File 'lib/dynamic_reports/charts.rb', line 158

def pie_chart(chart, columns, report)
  return if columns.size > 1 || chart.label_column.nil?
  column = columns.first.to_s

  ::GoogleChart::PieChart.new("#{chart.width}x#{chart.height}", chart.title, false) do |c|
    report.records.each do |record|
      if record.is_a?(Hash)
        c.data record[chart.label_column.to_s], record[column] if record[column].is_a?(Numeric)
      elsif record.respond_to?(column.to_sym)
        c.data record.send(chart.label_column.to_s), record.send(column.to_sym) if record.send(column.to_sym).is_a?(Numeric)
      else
        c.data chart.label_column.to_s, column if column.is_a?(Numeric)
      end
    end
    c.show_legend = false
    c.show_labels = true

    return c.to_url(chart.options)
  end
end

.random_color ⇒ Object

Method to select a random color from a list of hex codes

Example: random_color()

> “ff0000”



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# File 'lib/dynamic_reports/charts.rb', line 126

def random_color()
  color_list = %w{000000 0000ff ff0000 ffff00 00ffff ff00ff 00ff00}
  return color_list[rand(color_list.size)]
end