Dual X-Axis

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

require("chartdirector")

class DualxaxisController < ApplicationController

    def index()
        @title = "Dual X-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 = [42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70, 76, 63,
            67, 75, 64, 51]
        data1 = [50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84,
            82, 80, 84, 98]

        # The labels for the bottom x axis. Note the "-" means a minor tick.
        labels0 = ["0\nJun 4", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
            "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "0\nJun 5"]

        # The labels for the top x axis. Note that "-" means a minor tick.
        labels1 = ["Jun 3\n12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
            "Jun 4\n0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"]

        # Create a XYChart object of size 310 x 310 pixels
        c = ChartDirector::XYChart.new(310, 310)

        # Set the plotarea at (50, 50) and of size 200 x 200 pixels
        c.setPlotArea(50, 50, 200, 200)

        # Add a title to the primary (left) y axis
        c.yAxis().setTitle("US Dollars")

        # Set the tick length to -4 pixels (-ve means ticks inside the plot area)
        c.yAxis().setTickLength(-4)

        # Add a title to the secondary (right) y axis
        c.yAxis2().setTitle("HK Dollars (1 USD = 7.8 HKD)")

        # Set the tick length to -4 pixels (-ve means ticks inside the plot area)
        c.yAxis2().setTickLength(-4)

        # Synchronize the y-axis such that y2 = 7.8 x y1
        c.syncYAxis(7.8)

        # Add a title to the bottom x axis
        c.xAxis().setTitle("Hong Kong Time")

        # Set the labels on the x axis.
        c.xAxis().setLabels(labels0)

        # Display 1 out of 3 labels on the x-axis. Show minor ticks for remaining labels.
        c.xAxis().setLabelStep(3, 1)

        # Set the major tick length to -4 pixels and minor tick length to -2 pixels (-ve means ticks
        # inside the plot area)
        c.xAxis().setTickLength2(-4, -2)

        # Set the distance between the axis labels and the axis to 6 pixels
        c.xAxis().setLabelGap(6)

        # Add a title to the top x-axis
        c.xAxis2().setTitle("New York Time")

        # Set the labels on the x axis.
        c.xAxis2().setLabels(labels1)

        # Display 1 out of 3 labels on the x-axis. Show minor ticks for remaining labels.
        c.xAxis2().setLabelStep(3, 1)

        # Set the major tick length to -4 pixels and minor tick length to -2 pixels (-ve means ticks
        # inside the plot area)
        c.xAxis2().setTickLength2(-4, -2)

        # Set the distance between the axis labels and the axis to 6 pixels
        c.xAxis2().setLabelGap(6)

        # Add a line layer to the chart with a line width of 2 pixels
        c.addLineLayer(data0, -1, "Red Transactions").setLineWidth(2)

        # Add an area layer to the chart with no area boundary line
        c.addAreaLayer(data1, -1, "Green Transactions").setLineWidth(0)

        # 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/dualxaxis.rb

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

# The data for the chart
data0 = [42, 49, 33, 38, 51, 46, 29, 41, 44, 57, 59, 52, 37, 34, 51, 56, 56, 60, 70, 76, 63, 67, 75,
    64, 51]
data1 = [50, 55, 47, 34, 42, 49, 63, 62, 73, 59, 56, 50, 64, 60, 67, 67, 58, 59, 73, 77, 84, 82, 80,
    84, 98]

# The labels for the bottom x axis. Note the "-" means a minor tick.
labels0 = ["0\nJun 4", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14",
    "15", "16", "17", "18", "19", "20", "21", "22", "23", "0\nJun 5"]

# The labels for the top x axis. Note that "-" means a minor tick.
labels1 = ["Jun 3\n12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23",
    "Jun 4\n0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"]

# Create a XYChart object of size 310 x 310 pixels
c = ChartDirector::XYChart.new(310, 310)

# Set the plotarea at (50, 50) and of size 200 x 200 pixels
c.setPlotArea(50, 50, 200, 200)

# Add a title to the primary (left) y axis
c.yAxis().setTitle("US Dollars")

# Set the tick length to -4 pixels (-ve means ticks inside the plot area)
c.yAxis().setTickLength(-4)

# Add a title to the secondary (right) y axis
c.yAxis2().setTitle("HK Dollars (1 USD = 7.8 HKD)")

# Set the tick length to -4 pixels (-ve means ticks inside the plot area)
c.yAxis2().setTickLength(-4)

# Synchronize the y-axis such that y2 = 7.8 x y1
c.syncYAxis(7.8)

# Add a title to the bottom x axis
c.xAxis().setTitle("Hong Kong Time")

# Set the labels on the x axis.
c.xAxis().setLabels(labels0)

# Display 1 out of 3 labels on the x-axis. Show minor ticks for remaining labels.
c.xAxis().setLabelStep(3, 1)

# Set the major tick length to -4 pixels and minor tick length to -2 pixels (-ve means ticks inside
# the plot area)
c.xAxis().setTickLength2(-4, -2)

# Set the distance between the axis labels and the axis to 6 pixels
c.xAxis().setLabelGap(6)

# Add a title to the top x-axis
c.xAxis2().setTitle("New York Time")

# Set the labels on the x axis.
c.xAxis2().setLabels(labels1)

# Display 1 out of 3 labels on the x-axis. Show minor ticks for remaining labels.
c.xAxis2().setLabelStep(3, 1)

# Set the major tick length to -4 pixels and minor tick length to -2 pixels (-ve means ticks inside
# the plot area)
c.xAxis2().setTickLength2(-4, -2)

# Set the distance between the axis labels and the axis to 6 pixels
c.xAxis2().setLabelGap(6)

# Add a line layer to the chart with a line width of 2 pixels
c.addLineLayer(data0, -1, "Red Transactions").setLineWidth(2)

# Add an area layer to the chart with no area boundary line
c.addAreaLayer(data1, -1, "Green Transactions").setLineWidth(0)

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