Dual Horizontal Bar Charts

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

require("chartdirector")

class DualhbarController < ApplicationController

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

    #
    # Render and deliver the chart
    #
    def getchart()
        # The age groups
        labels = ["0 - 4", "5 - 9", "10 - 14", "15 - 19", "20 - 24", "24 - 29", "30 - 34",
            "35 - 39", "40 - 44", "44 - 49", "50 - 54", "55 - 59", "60 - 64", "65 - 69", "70 - 74",
            "75 - 79", "80+"]

        # The male population (in thousands)
        male = [215, 238, 225, 236, 235, 260, 286, 340, 363, 305, 259, 164, 135, 127, 102, 68, 66]

        # The female population (in thousands)
        female = [194, 203, 201, 220, 228, 271, 339, 401, 384, 304, 236, 137, 116, 122, 112, 85, 110
            ]


        #=============================================================
        #    Draw the right bar chart
        #=============================================================

        # Create a XYChart object of size 320 x 300 pixels
        c = ChartDirector::XYChart.new(320, 300)

        # Set the plotarea at (50, 0) and of size 250 x 255 pixels. Use pink (0xffdddd) as the
        # background.
        c.setPlotArea(50, 0, 250, 255, 0xffdddd)

        # Add a custom text label at the top right corner of the right bar chart
        c.addText(300, 0, "Female", "timesbi.ttf", 12, 0xa07070).setAlignment(
            ChartDirector::TopRight)

        # Add the pink (0xf0c0c0) bar chart layer using the female data
        femaleLayer = c.addBarLayer(female, 0xf0c0c0)

        # Swap the axis so that the bars are drawn horizontally
        c.swapXY(true)

        # Set the bar to touch each others
        femaleLayer.setBarGap(ChartDirector::TouchBar)

        # Set the border style of the bars to 1 pixel 3D border
        femaleLayer.setBorderColor(-1, 1)

        # Add a Transparent line layer to the chart using the male data. As it is Transparent, only
        # the female bar chart can be seen. We need to put both male and female data in both left
        # and right charts, because we want auto-scaling to produce the same scale for both chart.
        c.addLineLayer(male, ChartDirector::Transparent)

        # Set the y axis label font to Arial Bold
        c.yAxis().setLabelStyle("arialbd.ttf")

        # Set the labels between the two bar charts, which can be considered as the x-axis labels
        # for the right chart
        tb = c.xAxis().setLabels(labels)

        # Use a fix width of 50 for the labels (height = automatic) with center alignment
        tb.setSize(50, 0)
        tb.setAlignment(ChartDirector::Center)

        # Set the label font to Arial Bold
        tb.setFontStyle("arialbd.ttf")

        # Disable ticks on the x-axis by setting the tick length to 0
        c.xAxis().setTickLength(0)

        #=============================================================
        #    Draw the left bar chart
        #=============================================================

        # Create a XYChart object of size 280 x 300 pixels with a transparent background.
        c2 = ChartDirector::XYChart.new(280, 300, ChartDirector::Transparent)

        # Set the plotarea at (20, 0) and of size 250 x 255 pixels. Use pale blue (0xddddff) as the
        # background.
        c2.setPlotArea(20, 0, 250, 255, 0xddddff)

        # Add a custom text label at the top left corner of the left bar chart
        c2.addText(20, 0, "Male", "timesbi.ttf", 12, 0x7070a0)

        # Add the pale blue (0xaaaaff) bar chart layer using the male data
        maleLayer = c2.addBarLayer(male, 0xaaaaff)

        # Swap the axis so that the bars are drawn horizontally
        c2.swapXY(true)

        # Reverse the direction of the y-axis so it runs from right to left
        c2.yAxis().setReverse()

        # Set the bar to touch each others
        maleLayer.setBarGap(ChartDirector::TouchBar)

        # Set the border style of the bars to 1 pixel 3D border
        maleLayer.setBorderColor(-1, 1)

        # Add a Transparent line layer to the chart using the female data. As it is Transparent,
        # only the male bar chart can be seen. We need to put both male and female data in both left
        # and right charts, because we want auto-scaling to produce the same scale for both chart.
        c2.addLineLayer(female, ChartDirector::Transparent)

        # Set the y axis label font to Arial Bold
        c2.yAxis().setLabelStyle("arialbd.ttf")

        #=============================================================
        #    Use a MultiChart to contain both bar charts
        #=============================================================

        # Create a MultiChart object of size 590 x 320 pixels.
        m = ChartDirector::MultiChart.new(590, 320)

        # Add a title to the chart using Arial Bold Italic font
        m.addTitle("Demographics Hong Kong Year 2002", "arialbi.ttf")

        # Add another title at the bottom using Arial Bold Italic font
        m.addTitle2(ChartDirector::Bottom, "Population (in thousands)", "arialbi.ttf", 10)

        # Put the right chart at (270, 25)
        m.addChart(270, 25, c)

        # Put the left chart at (0, 25)
        m.addChart(0, 25, c2)

        # Output the chart
        send_data(m.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/dualhbar.rb

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

# The age groups
labels = ["0 - 4", "5 - 9", "10 - 14", "15 - 19", "20 - 24", "24 - 29", "30 - 34", "35 - 39",
    "40 - 44", "44 - 49", "50 - 54", "55 - 59", "60 - 64", "65 - 69", "70 - 74", "75 - 79", "80+"]

# The male population (in thousands)
male = [215, 238, 225, 236, 235, 260, 286, 340, 363, 305, 259, 164, 135, 127, 102, 68, 66]

# The female population (in thousands)
female = [194, 203, 201, 220, 228, 271, 339, 401, 384, 304, 236, 137, 116, 122, 112, 85, 110]


#=============================================================
#    Draw the right bar chart
#=============================================================

# Create a XYChart object of size 320 x 300 pixels
c = ChartDirector::XYChart.new(320, 300)

# Set the plotarea at (50, 0) and of size 250 x 255 pixels. Use pink (0xffdddd) as the background.
c.setPlotArea(50, 0, 250, 255, 0xffdddd)

# Add a custom text label at the top right corner of the right bar chart
c.addText(300, 0, "Female", "timesbi.ttf", 12, 0xa07070).setAlignment(ChartDirector::TopRight)

# Add the pink (0xf0c0c0) bar chart layer using the female data
femaleLayer = c.addBarLayer(female, 0xf0c0c0)

# Swap the axis so that the bars are drawn horizontally
c.swapXY(true)

# Set the bar to touch each others
femaleLayer.setBarGap(ChartDirector::TouchBar)

# Set the border style of the bars to 1 pixel 3D border
femaleLayer.setBorderColor(-1, 1)

# Add a Transparent line layer to the chart using the male data. As it is Transparent, only the
# female bar chart can be seen. We need to put both male and female data in both left and right
# charts, because we want auto-scaling to produce the same scale for both chart.
c.addLineLayer(male, ChartDirector::Transparent)

# Set the y axis label font to Arial Bold
c.yAxis().setLabelStyle("arialbd.ttf")

# Set the labels between the two bar charts, which can be considered as the x-axis labels for the
# right chart
tb = c.xAxis().setLabels(labels)

# Use a fix width of 50 for the labels (height = automatic) with center alignment
tb.setSize(50, 0)
tb.setAlignment(ChartDirector::Center)

# Set the label font to Arial Bold
tb.setFontStyle("arialbd.ttf")

# Disable ticks on the x-axis by setting the tick length to 0
c.xAxis().setTickLength(0)

#=============================================================
#    Draw the left bar chart
#=============================================================

# Create a XYChart object of size 280 x 300 pixels with a transparent background.
c2 = ChartDirector::XYChart.new(280, 300, ChartDirector::Transparent)

# Set the plotarea at (20, 0) and of size 250 x 255 pixels. Use pale blue (0xddddff) as the
# background.
c2.setPlotArea(20, 0, 250, 255, 0xddddff)

# Add a custom text label at the top left corner of the left bar chart
c2.addText(20, 0, "Male", "timesbi.ttf", 12, 0x7070a0)

# Add the pale blue (0xaaaaff) bar chart layer using the male data
maleLayer = c2.addBarLayer(male, 0xaaaaff)

# Swap the axis so that the bars are drawn horizontally
c2.swapXY(true)

# Reverse the direction of the y-axis so it runs from right to left
c2.yAxis().setReverse()

# Set the bar to touch each others
maleLayer.setBarGap(ChartDirector::TouchBar)

# Set the border style of the bars to 1 pixel 3D border
maleLayer.setBorderColor(-1, 1)

# Add a Transparent line layer to the chart using the female data. As it is Transparent, only the
# male bar chart can be seen. We need to put both male and female data in both left and right
# charts, because we want auto-scaling to produce the same scale for both chart.
c2.addLineLayer(female, ChartDirector::Transparent)

# Set the y axis label font to Arial Bold
c2.yAxis().setLabelStyle("arialbd.ttf")

#=============================================================
#    Use a MultiChart to contain both bar charts
#=============================================================

# Create a MultiChart object of size 590 x 320 pixels.
m = ChartDirector::MultiChart.new(590, 320)

# Add a title to the chart using Arial Bold Italic font
m.addTitle("Demographics Hong Kong Year 2002", "arialbi.ttf")

# Add another title at the bottom using Arial Bold Italic font
m.addTitle2(ChartDirector::Bottom, "Population (in thousands)", "arialbi.ttf", 10)

# Put the right chart at (270, 25)
m.addChart(270, 25, c)

# Put the left chart at (0, 25)
m.addChart(0, 25, c2)

# Output the chart
m.makeChart("dualhbar.png")