Dual Y-Axis

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

require("chartdirector")

class DualyaxisController < ApplicationController

    def index()
        @title = "Dual Y-Axis"
        @ctrl_file = File.expand_path(__FILE__)
        @noOfCharts = 1
        render :template => "templates/chartview"
    end

    #
    # Render and deliver the chart
    #
    def getchart()
        # The data for the chart
        data0 = [0.05, 0.06, 0.48, 0.1, 0.01, 0.05]
        data1 = [100, 125, 265, 147, 67, 105]
        labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]

        # Create a XYChart object of size 300 x 180 pixels
        c = ChartDirector::XYChart.new(300, 180)

        # Set the plot area at (50, 20) and of size 200 x 130 pixels
        c.setPlotArea(50, 20, 200, 130)

        # Add a title to the chart using 8pt Arial Bold font
        c.addTitle("Independent Y-Axis Demo", "arialbd.ttf", 8)

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

        # Add a title to the primary (left) y axis
        c.yAxis().setTitle("Packet Drop Rate (pps)")

        # Set the axis, label and title colors for the primary y axis to red (0xc00000) to match the
        # first data set
        c.yAxis().setColors(0xc00000, 0xc00000, 0xc00000)

        # Add a title to the secondary (right) y axis
        c.yAxis2().setTitle("Throughtput (MBytes)")

        # set the axis, label and title colors for the primary y axis to green (0x008000) to match
        # the second data set
        c.yAxis2().setColors(0x008000, 0x008000, 0x008000)

        # Add a line layer to for the first data set using red (0xc00000) color with a line width to
        # 3 pixels
        c.addLineLayer(data0, 0xc00000).setLineWidth(3)

        # Add a bar layer to for the second data set using green (0x00C000) color. Bind the second
        # data set to the secondary (right) y axis
        c.addBarLayer(data1, 0x00c000).setUseYAxis2()

        # 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/dualyaxis.rb

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

# The data for the chart
data0 = [0.05, 0.06, 0.48, 0.1, 0.01, 0.05]
data1 = [100, 125, 265, 147, 67, 105]
labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun"]

# Create a XYChart object of size 300 x 180 pixels
c = ChartDirector::XYChart.new(300, 180)

# Set the plot area at (50, 20) and of size 200 x 130 pixels
c.setPlotArea(50, 20, 200, 130)

# Add a title to the chart using 8pt Arial Bold font
c.addTitle("Independent Y-Axis Demo", "arialbd.ttf", 8)

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

# Add a title to the primary (left) y axis
c.yAxis().setTitle("Packet Drop Rate (pps)")

# Set the axis, label and title colors for the primary y axis to red (0xc00000) to match the first
# data set
c.yAxis().setColors(0xc00000, 0xc00000, 0xc00000)

# Add a title to the secondary (right) y axis
c.yAxis2().setTitle("Throughtput (MBytes)")

# set the axis, label and title colors for the primary y axis to green (0x008000) to match the
# second data set
c.yAxis2().setColors(0x008000, 0x008000, 0x008000)

# Add a line layer to for the first data set using red (0xc00000) color with a line width to 3
# pixels
c.addLineLayer(data0, 0xc00000).setLineWidth(3)

# Add a bar layer to for the second data set using green (0x00C000) color. Bind the second data set
# to the secondary (right) y axis
c.addBarLayer(data1, 0x00c000).setUseYAxis2()

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