ChartDirector 6.0 (Ruby Edition)

Simple Line Chart




This example demonstrates the basic steps in creating line charts.

Source Code Listing

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

class SimplelineController < ApplicationController

    def index()
        @title = "Simple Line 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 line chart
        data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 91, 60, 55, 53, 35, 50, 66, 56,
            48, 52, 65, 62]

        # The labels for the line chart
        labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14",
            "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"]

        # Create a XYChart object of size 250 x 250 pixels
        c = ChartDirector::XYChart.new(250, 250)

        # Set the plotarea at (30, 20) and of size 200 x 200 pixels
        c.setPlotArea(30, 20, 200, 200)

        # Add a line chart layer using the given data
        c.addLineLayer(data)

        # Set the labels on the x axis.
        c.xAxis().setLabels(labels)

        # Display 1 out of 3 labels on the x-axis.
        c.xAxis().setLabelStep(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/simpleline.rb
#!/usr/bin/env ruby
require("chartdirector")

# The data for the line chart
data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 91, 60, 55, 53, 35, 50, 66, 56, 48, 52,
    65, 62]

# The labels for the line chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15",
    "16", "17", "18", "19", "20", "21", "22", "23", "24"]

# Create a XYChart object of size 250 x 250 pixels
c = ChartDirector::XYChart.new(250, 250)

# Set the plotarea at (30, 20) and of size 200 x 200 pixels
c.setPlotArea(30, 20, 200, 200)

# Add a line chart layer using the given data
c.addLineLayer(data)

# Set the labels on the x axis.
c.xAxis().setLabels(labels)

# Display 1 out of 3 labels on the x-axis.
c.xAxis().setLabelStep(3)

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