Overlapping Bar Chart

[Ruby On Rails Version - Controller] app/controllers/overlapbar_controller.rb

require("chartdirector")

class OverlapbarController < ApplicationController

    def index()
        @title = "Overlapping Bar Chart"
        @ctrl_file = File.expand_path(__FILE__)
        @noOfCharts = 1
        render :template => "templates/chartview"
    end

    #
    # Render and deliver the chart
    #
    def getchart()
        # The data for the bar chart
        data0 = [100, 125, 156, 147, 87, 124, 178, 109, 140, 106, 192, 122]
        data1 = [122, 156, 179, 211, 198, 177, 160, 220, 190, 188, 220, 270]
        data2 = [167, 190, 213, 267, 250, 320, 212, 199, 245, 267, 240, 310]
        labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov",
            "Dec"]

        # Create a XYChart object of size 580 x 280 pixels
        c = ChartDirector::XYChart.new(580, 280)

        # Add a title to the chart using 14pt Arial Bold Italic font
        c.addTitle("Product Revenue For Last 3 Years", "arialbi.ttf", 14)

        # Set the plot area at (50, 50) and of size 500 x 200. Use two alternative background colors
        # (f8f8f8 and ffffff)
        c.setPlotArea(50, 50, 500, 200, 0xf8f8f8, 0xffffff)

        # Add a legend box at (50, 25) using horizontal layout. Use 8pt Arial as font, with
        # transparent background.
        c.addLegend(50, 25, false, "arial.ttf", 8).setBackground(ChartDirector::Transparent)

        # Set the x axis labels
        c.xAxis().setLabels(labels)

        # Draw the ticks between label positions (instead of at label positions)
        c.xAxis().setTickOffset(0.5)

        # Add a multi-bar layer with 3 data sets
        layer = c.addBarLayer2(ChartDirector::Side)
        layer.addDataSet(data0, 0xff8080, "Year 2003")
        layer.addDataSet(data1, 0x80ff80, "Year 2004")
        layer.addDataSet(data2, 0x8080ff, "Year 2005")

        # Set 50% overlap between bars
        layer.setOverlapRatio(0.5)

        # Add a title to the y-axis
        c.yAxis().setTitle("Revenue (USD in millions)")

        # Output the chart
        send_data(c.makeChart2(ChartDirector::PNG), :type => "image/png", :disposition => "inline")

    end

end

[Ruby On Rails Version - View] app/views/templates/chartview.html.erb

<html>
<body style="margin:5px 0px 0px 5px">

<!-- Title -->
<div style="font-size:18pt; font-family:verdana; font-weight:bold">
    <%= @title %>
</div>
<hr style="border:solid 1px #000080" />

<!-- Source Code Listing Link -->
<div style="font-size:9pt; font-family:verdana; margin-bottom:1.5em">
    <%= link_to "Source Code Listing", 
        :controller => "cddemo", :action => "viewsource",
        :ctrl_file => @ctrl_file, :view_file => File.expand_path(__FILE__) %>
</div>

<!-- Create one or more IMG tags to display the demo chart(s) -->
<% 0.upto(@noOfCharts - 1) do |i| %>
    <img src="<%= url_for(:action => "getchart", :img => i) %>">
<% end %>

</body>
</html>

[Command Line Version] rubydemo/overlapbar.rb

#!/usr/bin/env ruby
require("chartdirector")

# The data for the bar chart
data0 = [100, 125, 156, 147, 87, 124, 178, 109, 140, 106, 192, 122]
data1 = [122, 156, 179, 211, 198, 177, 160, 220, 190, 188, 220, 270]
data2 = [167, 190, 213, 267, 250, 320, 212, 199, 245, 267, 240, 310]
labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec"]

# Create a XYChart object of size 580 x 280 pixels
c = ChartDirector::XYChart.new(580, 280)

# Add a title to the chart using 14pt Arial Bold Italic font
c.addTitle("Product Revenue For Last 3 Years", "arialbi.ttf", 14)

# Set the plot area at (50, 50) and of size 500 x 200. Use two alternative background colors (f8f8f8
# and ffffff)
c.setPlotArea(50, 50, 500, 200, 0xf8f8f8, 0xffffff)

# Add a legend box at (50, 25) using horizontal layout. Use 8pt Arial as font, with transparent
# background.
c.addLegend(50, 25, false, "arial.ttf", 8).setBackground(ChartDirector::Transparent)

# Set the x axis labels
c.xAxis().setLabels(labels)

# Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5)

# Add a multi-bar layer with 3 data sets
layer = c.addBarLayer2(ChartDirector::Side)
layer.addDataSet(data0, 0xff8080, "Year 2003")
layer.addDataSet(data1, 0x80ff80, "Year 2004")
layer.addDataSet(data2, 0x8080ff, "Year 2005")

# Set 50% overlap between bars
layer.setOverlapRatio(0.5)

# Add a title to the y-axis
c.yAxis().setTitle("Revenue (USD in millions)")

# Output the chart
c.makeChart("overlapbar.png")