Polar Spline Chart

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

require("chartdirector")

class PolarsplineController < ApplicationController

    def index()
        @title = "Polar Spline 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 chart
        data0 = [5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1, 2.3,
            3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3]
        angles0 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255,
            270, 285, 300, 315, 330, 345]

        data1 = [8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1, 8.8, 7.9,
            2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0]
        angles1 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255,
            270, 285, 300, 315, 330, 345]

        # Create a PolarChart object of size 460 x 460 pixels
        c = ChartDirector::PolarChart.new(460, 460)

        # Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
        c.addTitle2(ChartDirector::TopLeft, "<*underline=2*>EM Field Strength", "arialbi.ttf", 15)

        # Set center of plot area at (230, 240) with radius 180 pixels
        c.setPlotArea(230, 240, 180)

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

        # Add a legend box at the top right corner of the chart using 9pt Arial Bold font
        c.addLegend(459, 0, true, "arialbd.ttf", 9).setAlignment(ChartDirector::TopRight)

        # Set angular axis as 0 - 360, with a spoke every 30 units
        c.angularAxis().setLinearScale(0, 360, 30)

        # Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
        c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0)

        # Add a blue (0xff) spline line layer to the chart using (data1, angle1)
        layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz")
        layer1.setAngles(angles1)

        # Set the line width to 3 pixels
        layer1.setLineWidth(3)

        # 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/polarspline.rb

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

# The data for the chart
data0 = [5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1, 2.3, 3.5, 7.7,
    8.8, 6.1, 5.0, 3.1, 6.0, 4.3]
angles0 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270,
    285, 300, 315, 330, 345]

data1 = [8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1, 8.8, 7.9, 2.2, 5.0,
    4.0, 1.5, 7.5, 8.3, 9.0]
angles1 = [0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270,
    285, 300, 315, 330, 345]

# Create a PolarChart object of size 460 x 460 pixels
c = ChartDirector::PolarChart.new(460, 460)

# Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
c.addTitle2(ChartDirector::TopLeft, "<*underline=2*>EM Field Strength", "arialbi.ttf", 15)

# Set center of plot area at (230, 240) with radius 180 pixels
c.setPlotArea(230, 240, 180)

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

# Add a legend box at the top right corner of the chart using 9pt Arial Bold font
c.addLegend(459, 0, true, "arialbd.ttf", 9).setAlignment(ChartDirector::TopRight)

# Set angular axis as 0 - 360, with a spoke every 30 units
c.angularAxis().setLinearScale(0, 360, 30)

# Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0)

# Add a blue (0xff) spline line layer to the chart using (data1, angle1)
layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz")
layer1.setAngles(angles1)

# Set the line width to 3 pixels
layer1.setLineWidth(3)

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