Polar Area Chart

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

require("chartdirector")

class PolarareaController < ApplicationController

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

    #
    # Render and deliver the chart
    #
    def getchart()
        # Data for the chart
        data0 = [5, 3, 10, 4, 3, 5, 2, 5]
        data1 = [12, 6, 17, 6, 7, 9, 4, 7]
        data2 = [17, 7, 22, 7, 18, 13, 5, 11]

        labels = ["North", "North<*br*>East", "East", "South<*br*>East", "South", "South<*br*>West",
            "West", "North<*br*>West"]

        # Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1
        # pixel 3D border
        c = ChartDirector::PolarChart.new(460, 500, 0xe0e0e0, 0x000000, 1)

        # Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a
        # wood pattern as the title background.
        c.addTitle("Polar Area Chart Demo", "arialbi.ttf", 15).setBackground(c.patternColor(
            File.dirname(__FILE__) + "/wood.png"))

        # Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff)
        # background.
        c.setPlotArea(230, 280, 180, 0xffffff)

        # Set the grid style to circular grid
        c.setGridStyle(false)

        # Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt
        # Arial Bold font, with 1 pixel 3D border effect.
        b = c.addLegend(230, 35, false, "arialbd.ttf", 9)
        b.setAlignment(ChartDirector::TopCenter)
        b.setBackground(ChartDirector::Transparent, ChartDirector::Transparent, 1)

        # Set angular axis using the given labels
        c.angularAxis().setLabels(labels)

        # Specify the label format for the radial axis
        c.radialAxis().setLabelFormat("{value}%")

        # Set radial axis label background to semi-transparent grey (40cccccc)
        c.radialAxis().setLabelStyle().setBackground(0x40cccccc, 0)

        # Add the data as area layers
        c.addAreaLayer(data2, -1, "5 m/s or above")
        c.addAreaLayer(data1, -1, "1 - 5 m/s")
        c.addAreaLayer(data0, -1, "less than 1 m/s")

        # 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/polararea.rb

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

# Data for the chart
data0 = [5, 3, 10, 4, 3, 5, 2, 5]
data1 = [12, 6, 17, 6, 7, 9, 4, 7]
data2 = [17, 7, 22, 7, 18, 13, 5, 11]

labels = ["North", "North<*br*>East", "East", "South<*br*>East", "South", "South<*br*>West", "West",
    "North<*br*>West"]

# Create a PolarChart object of size 460 x 500 pixels, with a grey (e0e0e0) background and 1 pixel
# 3D border
c = ChartDirector::PolarChart.new(460, 500, 0xe0e0e0, 0x000000, 1)

# Add a title to the chart at the top left corner using 15pt Arial Bold Italic font. Use a wood
# pattern as the title background.
c.addTitle("Polar Area Chart Demo", "arialbi.ttf", 15).setBackground(c.patternColor("wood.png"))

# Set center of plot area at (230, 280) with radius 180 pixels, and white (ffffff) background.
c.setPlotArea(230, 280, 180, 0xffffff)

# Set the grid style to circular grid
c.setGridStyle(false)

# Add a legend box at top-center of plot area (230, 35) using horizontal layout. Use 10pt Arial Bold
# font, with 1 pixel 3D border effect.
b = c.addLegend(230, 35, false, "arialbd.ttf", 9)
b.setAlignment(ChartDirector::TopCenter)
b.setBackground(ChartDirector::Transparent, ChartDirector::Transparent, 1)

# Set angular axis using the given labels
c.angularAxis().setLabels(labels)

# Specify the label format for the radial axis
c.radialAxis().setLabelFormat("{value}%")

# Set radial axis label background to semi-transparent grey (40cccccc)
c.radialAxis().setLabelStyle().setBackground(0x40cccccc, 0)

# Add the data as area layers
c.addAreaLayer(data2, -1, "5 m/s or above")
c.addAreaLayer(data1, -1, "1 - 5 m/s")
c.addAreaLayer(data0, -1, "less than 1 m/s")

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