Gradient Multi-Bar Chart

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

require("chartdirector")

class GradientmultibarController < ApplicationController

    def index()
        @title = "Gradient Multi-Bar 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 bar chart
        data0 = [100, 125, 245, 147, 67]
        data1 = [85, 156, 179, 211, 123]
        data2 = [97, 87, 56, 267, 157]
        labels = ["Mon", "Tue", "Wed", "Thur", "Fri"]

        # Create a XYChart object of size 540 x 375 pixels
        c = ChartDirector::XYChart.new(540, 375)

        # Add a title to the chart using 18pt Times Bold Italic font
        c.addTitle("Average Weekly Network Load", "timesbi.ttf", 18)

        # Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient
        # color from grey (888888) to black (000000) as background. Set border and grid lines to
        # white (ffffff).
        c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0x888888, 0x000000),
            -1, 0xffffff, 0xffffff)

        # Add a legend box at (50, 25) using horizontal layout. Use 10pt Arial Bold as font, with
        # transparent background.
        c.addLegend(50, 25, false, "arialbd.ttf", 10).setBackground(ChartDirector::Transparent)

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

        # Draw the ticks between label positions (instead of at label positions)
        c.xAxis().setTickOffset(0.5)

        # Set axis label style to 8pt Arial Bold
        c.xAxis().setLabelStyle("arialbd.ttf", 8)
        c.yAxis().setLabelStyle("arialbd.ttf", 8)

        # Set axis line width to 2 pixels
        c.xAxis().setWidth(2)
        c.yAxis().setWidth(2)

        # Add axis title
        c.yAxis().setTitle("Throughput (MBytes Per Hour)")

        # Add a multi-bar layer with 3 data sets and 4 pixels 3D depth
        layer = c.addBarLayer2(ChartDirector::Side, 4)
        layer.addDataSet(data0, 0x66aaee, "Server #1")
        layer.addDataSet(data1, 0xeebb22, "Server #2")
        layer.addDataSet(data2, 0xcc0000, "Server #3")

        # Set bar border to transparent. Use bar gradient lighting with light intensity from 0.75 to
        # 1.75.
        layer.setBorderColor(ChartDirector::Transparent, ChartDirector::barLighting(0.75, 1.75))

        # Configure the bars within a group to touch each others (no gap)
        layer.setBarGap(0.2, ChartDirector::TouchBar)

        # 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/gradientmultibar.rb

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

# The data for the bar chart
data0 = [100, 125, 245, 147, 67]
data1 = [85, 156, 179, 211, 123]
data2 = [97, 87, 56, 267, 157]
labels = ["Mon", "Tue", "Wed", "Thur", "Fri"]

# Create a XYChart object of size 540 x 375 pixels
c = ChartDirector::XYChart.new(540, 375)

# Add a title to the chart using 18pt Times Bold Italic font
c.addTitle("Average Weekly Network Load", "timesbi.ttf", 18)

# Set the plotarea at (50, 55) and of 440 x 280 pixels in size. Use a vertical gradient color from
# grey (888888) to black (000000) as background. Set border and grid lines to white (ffffff).
c.setPlotArea(50, 55, 440, 280, c.linearGradientColor(0, 55, 0, 335, 0x888888, 0x000000), -1,
    0xffffff, 0xffffff)

# Add a legend box at (50, 25) using horizontal layout. Use 10pt Arial Bold as font, with
# transparent background.
c.addLegend(50, 25, false, "arialbd.ttf", 10).setBackground(ChartDirector::Transparent)

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

# Draw the ticks between label positions (instead of at label positions)
c.xAxis().setTickOffset(0.5)

# Set axis label style to 8pt Arial Bold
c.xAxis().setLabelStyle("arialbd.ttf", 8)
c.yAxis().setLabelStyle("arialbd.ttf", 8)

# Set axis line width to 2 pixels
c.xAxis().setWidth(2)
c.yAxis().setWidth(2)

# Add axis title
c.yAxis().setTitle("Throughput (MBytes Per Hour)")

# Add a multi-bar layer with 3 data sets and 4 pixels 3D depth
layer = c.addBarLayer2(ChartDirector::Side, 4)
layer.addDataSet(data0, 0x66aaee, "Server #1")
layer.addDataSet(data1, 0xeebb22, "Server #2")
layer.addDataSet(data2, 0xcc0000, "Server #3")

# Set bar border to transparent. Use bar gradient lighting with light intensity from 0.75 to 1.75.
layer.setBorderColor(ChartDirector::Transparent, ChartDirector::barLighting(0.75, 1.75))

# Configure the bars within a group to touch each others (no gap)
layer.setBarGap(0.2, ChartDirector::TouchBar)

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