ChartDirector 6.0 (Ruby Edition)

Simple Bar Chart (2)




This example extends the Simple Bar Chart (1) example to demonstrates various methods to control the chart appearance and to add titles.

Source Code Listing

[Ruby On Rails Version - Controller] app/controllers/simplebar2_controller.rb
require("chartdirector")

class Simplebar2Controller < ApplicationController

    def index()
        @title = "Simple Bar Chart (2)"
        @ctrl_file = File.expand_path(__FILE__)
        @noOfCharts = 1
        render :template => "templates/chartview"
    end

    #
    # Render and deliver the chart
    #
    def getchart()
        # The data for the bar chart
        data = [85, 156, 179, 211, 123, 189, 166]

        # The labels for the bar chart
        labels = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]

        # Create a XYChart object of size 600 x 400 pixels
        c = ChartDirector::XYChart.new(600, 400)

        # Add a title box using grey (0x555555) 24pt Arial Bold font
        c.addTitle("    Bar Chart Demonstration", "arialbd.ttf", 24, 0x555555)

        # Set the plotarea at (70, 60) and of size 500 x 300 pixels, with transparent background and
        # border and light grey (0xcccccc) horizontal grid lines
        c.setPlotArea(70, 60, 500, 300, ChartDirector::Transparent, -1, ChartDirector::Transparent,
            0xcccccc)

        # Set the x and y axis stems to transparent and the label font to 12pt Arial
        c.xAxis().setColors(ChartDirector::Transparent)
        c.yAxis().setColors(ChartDirector::Transparent)
        c.xAxis().setLabelStyle("arial.ttf", 12)
        c.yAxis().setLabelStyle("arial.ttf", 12)

        # Add a blue (0x6699bb) bar chart layer with transparent border using the given data
        c.addBarLayer(data, 0x6699bb).setBorderColor(ChartDirector::Transparent)

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

        # For the automatic y-axis labels, set the minimum spacing to 40 pixels.
        c.yAxis().setTickDensity(40)

        # Add a title to the y axis using dark grey (0x555555) 14pt Arial Bold font
        c.yAxis().setTitle("Y-Axis Title Placeholder", "arialbd.ttf", 14, 0x555555)

        # 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/simplebar2.rb
#!/usr/bin/env ruby
require("chartdirector")

# The data for the bar chart
data = [85, 156, 179, 211, 123, 189, 166]

# The labels for the bar chart
labels = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"]

# Create a XYChart object of size 600 x 400 pixels
c = ChartDirector::XYChart.new(600, 400)

# Add a title box using grey (0x555555) 24pt Arial Bold font
c.addTitle("    Bar Chart Demonstration", "arialbd.ttf", 24, 0x555555)

# Set the plotarea at (70, 60) and of size 500 x 300 pixels, with transparent background and border
# and light grey (0xcccccc) horizontal grid lines
c.setPlotArea(70, 60, 500, 300, ChartDirector::Transparent, -1, ChartDirector::Transparent, 0xcccccc
    )

# Set the x and y axis stems to transparent and the label font to 12pt Arial
c.xAxis().setColors(ChartDirector::Transparent)
c.yAxis().setColors(ChartDirector::Transparent)
c.xAxis().setLabelStyle("arial.ttf", 12)
c.yAxis().setLabelStyle("arial.ttf", 12)

# Add a blue (0x6699bb) bar chart layer with transparent border using the given data
c.addBarLayer(data, 0x6699bb).setBorderColor(ChartDirector::Transparent)

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

# For the automatic y-axis labels, set the minimum spacing to 40 pixels.
c.yAxis().setTickDensity(40)

# Add a title to the y axis using dark grey (0x555555) 14pt Arial Bold font
c.yAxis().setTitle("Y-Axis Title Placeholder", "arialbd.ttf", 14, 0x555555)

# Output the chart
c.makeChart("simplebar2.png")