Sector Zones

[Ruby On Rails Version - Controller] app/controllers/polarzones2_controller.rb

require("chartdirector")

class Polarzones2Controller < ApplicationController

    def index()
        @title = "Sector Zones"
        @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
        data = [5.1, 1.5, 5.1, 4.0, 1.7, 8.7, 9.4, 2.1, 3.5, 8.8, 5.0, 6.0]

        # The labels for the chart
        labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov",
            "Dec"]

        # Create a PolarChart object of size 400 x 420 pixels. with a metallic blue (9999ff)
        # background color and 1 pixel 3D border
        c = ChartDirector::PolarChart.new(400, 420, ChartDirector::metalColor(0x9999ff), 0x000000, 1
            )

        # Add a title to the chart using 16pt Arial Bold Italic font. The title text is white
        # (0xffffff) on deep blue (000080) background
        c.addTitle("Chemical Concentration", "arialbi.ttf", 16, 0xffffff).setBackground(0x000080)

        # Set center of plot area at (200, 240) with radius 145 pixels. Set background color to
        # green (0x33ff33)
        c.setPlotArea(200, 240, 145, 0x33ff33)

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

        # Color the sector between label index = 5.5 to 7.5 as red (ff3333) zone
        c.angularAxis().addZone(5.5, 7.5, 0xff3333)

        # Color the sector between label index = 4.5 to 5.5, and also between 7.5 to 8.5, as yellow
        # (ff3333) zones
        c.angularAxis().addZone(4.5, 5.5, 0xffff00)
        c.angularAxis().addZone(7.5, 8.5, 0xffff00)

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

        # Use semi-transparent (40ffffff) label background so as not to block the data
        c.radialAxis().setLabelStyle().setBackground(0x40ffffff, 0x40000000)

        # Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black
        # border.
        legendBox = c.addLegend(200, 30, false, "arialbd.ttf", 9)
        legendBox.setAlignment(ChartDirector::TopCenter)

        # Add legend keys to represent the red/yellow/green zones
        legendBox.addKey("Very Dry", 0xff3333)
        legendBox.addKey("Critical", 0xffff00)
        legendBox.addKey("Moderate", 0x33ff33)

        # Add a blue (0x80) line layer with line width set to 3 pixels and use purple (ff00ff) cross
        # symbols for the data points
        layer = c.addLineLayer(data, 0x000080)
        layer.setLineWidth(3)
        layer.setDataSymbol(ChartDirector::Cross2Shape(), 15, 0xff00ff)

        # 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/polarzones2.rb

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

# The data for the chart
data = [5.1, 1.5, 5.1, 4.0, 1.7, 8.7, 9.4, 2.1, 3.5, 8.8, 5.0, 6.0]

# The labels for the chart
labels = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sept", "Oct", "Nov", "Dec"]

# Create a PolarChart object of size 400 x 420 pixels. with a metallic blue (9999ff) background
# color and 1 pixel 3D border
c = ChartDirector::PolarChart.new(400, 420, ChartDirector::metalColor(0x9999ff), 0x000000, 1)

# Add a title to the chart using 16pt Arial Bold Italic font. The title text is white (0xffffff) on
# deep blue (000080) background
c.addTitle("Chemical Concentration", "arialbi.ttf", 16, 0xffffff).setBackground(0x000080)

# Set center of plot area at (200, 240) with radius 145 pixels. Set background color to green
# (0x33ff33)
c.setPlotArea(200, 240, 145, 0x33ff33)

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

# Color the sector between label index = 5.5 to 7.5 as red (ff3333) zone
c.angularAxis().addZone(5.5, 7.5, 0xff3333)

# Color the sector between label index = 4.5 to 5.5, and also between 7.5 to 8.5, as yellow (ff3333)
# zones
c.angularAxis().addZone(4.5, 5.5, 0xffff00)
c.angularAxis().addZone(7.5, 8.5, 0xffff00)

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

# Use semi-transparent (40ffffff) label background so as not to block the data
c.radialAxis().setLabelStyle().setBackground(0x40ffffff, 0x40000000)

# Add a legend box at (200, 30) top center aligned, using 9pt Arial Bold font. with a black border.
legendBox = c.addLegend(200, 30, false, "arialbd.ttf", 9)
legendBox.setAlignment(ChartDirector::TopCenter)

# Add legend keys to represent the red/yellow/green zones
legendBox.addKey("Very Dry", 0xff3333)
legendBox.addKey("Critical", 0xffff00)
legendBox.addKey("Moderate", 0x33ff33)

# Add a blue (0x80) line layer with line width set to 3 pixels and use purple (ff00ff) cross symbols
# for the data points
layer = c.addLineLayer(data, 0x000080)
layer.setLineWidth(3)
layer.setDataSymbol(ChartDirector::Cross2Shape(), 15, 0xff00ff)

# Output the chart
c.makeChart("polarzones2.png")