ChartDirector 6.0 (Ruby Edition)

Pie Chart with Legend (1)




This example demonstrates how to add a legend box to a pie chart. It also demonstrates alternative sector label format and rounded edge sector shading.

Source Code Listing

[Ruby On Rails Version - Controller] app/controllers/legendpie_controller.rb
require("chartdirector")

class LegendpieController < ApplicationController

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

    #
    # Render and deliver the chart
    #
    def getchart()
        # The data for the pie chart
        data = [25, 18, 15, 12, 8, 30, 35]

        # The labels for the pie chart
        labels = ["Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities", "Production"]

        # Create a PieChart object of size 450 x 270 pixels
        c = ChartDirector::PieChart.new(450, 270)

        # Set the center of the pie at (150, 100) and the radius to 80 pixels
        c.setPieSize(150, 135, 100)

        # add a legend box where the top left corner is at (330, 50)
        c.addLegend(330, 60)

        # modify the sector label format to show percentages only
        c.setLabelFormat("{percent}%")

        # Set the pie data and the pie labels
        c.setData(data, labels)

        # Use rounded edge shading, with a 1 pixel white (FFFFFF) border
        c.setSectorStyle(ChartDirector::RoundedEdgeShading, 0xffffff, 1)

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

# The data for the pie chart
data = [25, 18, 15, 12, 8, 30, 35]

# The labels for the pie chart
labels = ["Labor", "Licenses", "Taxes", "Legal", "Insurance", "Facilities", "Production"]

# Create a PieChart object of size 450 x 270 pixels
c = ChartDirector::PieChart.new(450, 270)

# Set the center of the pie at (150, 100) and the radius to 80 pixels
c.setPieSize(150, 135, 100)

# add a legend box where the top left corner is at (330, 50)
c.addLegend(330, 60)

# modify the sector label format to show percentages only
c.setLabelFormat("{percent}%")

# Set the pie data and the pie labels
c.setData(data, labels)

# Use rounded edge shading, with a 1 pixel white (FFFFFF) border
c.setSectorStyle(ChartDirector::RoundedEdgeShading, 0xffffff, 1)

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