Multi-Color Bar Chart (1)

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

require("chartdirector")

class ColorbarController < ApplicationController

    def index()
        @title = "Multi-Color Bar Chart (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 bar chart
        data = [85, 156, 179, 211, 123, 189, 166]

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

        # The colors for the bars
        colors = [0x5588bb, 0x66bbbb, 0xaa6644, 0x99bb55, 0xee9944, 0x444466, 0xbb5555]

        # 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 font
        c.addTitle("Multi-Color Bar Chart", "arial.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 multi-color bar chart layer with transparent border using the given data
        c.addBarLayer3(data, colors).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 font
        c.yAxis().setTitle("Y-Axis Title Placeholder", "arial.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/colorbar.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"]

# The colors for the bars
colors = [0x5588bb, 0x66bbbb, 0xaa6644, 0x99bb55, 0xee9944, 0x444466, 0xbb5555]

# 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 font
c.addTitle("Multi-Color Bar Chart", "arial.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 multi-color bar chart layer with transparent border using the given data
c.addBarLayer3(data, colors).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 font
c.yAxis().setTitle("Y-Axis Title Placeholder", "arial.ttf", 14, 0x555555)

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