Gradient Bar Shading

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

require("chartdirector")

class GradientbarController < ApplicationController

    def index()
        @title = "Gradient Bar Shading"
        @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 = [1350, 1600, 1950, 2300, 2700]

        # The labels for the bar chart
        labels = ["2001", "2002", "2003", "2004", "2005"]

        # The colors for the bars
        colors = [0xcc0000, 0x66aaee, 0xeebb22, 0xcccccc, 0xcc88ff]

        # Create a PieChart object of size 600 x 380 pixels.
        c = ChartDirector::XYChart.new(600, 380)

        # Use the white on black palette, which means the default text and line colors are white
        c.setColors(ChartDirector::whiteOnBlackPalette)

        # Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use
        # rounded corners of 30 pixels radius for the top-left and bottom-right corners.
        c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044))
        c.setRoundedFrame(0xffffff, 30, 0, 30, 0)

        # Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom
        # margins to the title.
        title = c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)
        title.setMargin2(0, 0, 6, 6)

        # Add a separator line in white color just under the title
        c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), 0xffffff)

        # Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent
        # border and white grid lines
        c.setPlotArea(70, 80, 480, 240, -1, -1, ChartDirector::Transparent, 0xffffff)

        # Swap the axis so that the bars are drawn horizontally
        c.swapXY()

        # Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with
        # the light intensity from 0.75 to 2.0
        c.addBarLayer3(data, colors).setBorderColor(ChartDirector::Transparent,
            ChartDirector::barLighting(0.75, 2.0))

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

        # Show the same scale on the left and right y-axes
        c.syncYAxis()

        # Set the bottom y-axis title using 10pt Arial Bold font
        c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)

        # Set y-axes to transparent
        c.yAxis().setColors(ChartDirector::Transparent)
        c.yAxis2().setColors(ChartDirector::Transparent)

        # Disable ticks on the x-axis by setting the tick color to transparent
        c.xAxis().setTickColor(ChartDirector::Transparent)

        # Set the label styles of all axes to 8pt Arial Bold font
        c.xAxis().setLabelStyle("arialbd.ttf", 8)
        c.yAxis().setLabelStyle("arialbd.ttf", 8)
        c.yAxis2().setLabelStyle("arialbd.ttf", 8)

        # Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels
        # from the left edge, 25 pixels below the title, 50 pixels from the right edge, and 25
        # pixels from the bottom edge.
        c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25)

        # 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/gradientbar.rb

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

# The data for the bar chart
data = [1350, 1600, 1950, 2300, 2700]

# The labels for the bar chart
labels = ["2001", "2002", "2003", "2004", "2005"]

# The colors for the bars
colors = [0xcc0000, 0x66aaee, 0xeebb22, 0xcccccc, 0xcc88ff]

# Create a PieChart object of size 600 x 380 pixels.
c = ChartDirector::XYChart.new(600, 380)

# Use the white on black palette, which means the default text and line colors are white
c.setColors(ChartDirector::whiteOnBlackPalette)

# Use a vertical gradient color from blue (0000cc) to deep blue (000044) as background. Use rounded
# corners of 30 pixels radius for the top-left and bottom-right corners.
c.setBackground(c.linearGradientColor(0, 0, 0, c.getHeight(), 0x0000cc, 0x000044))
c.setRoundedFrame(0xffffff, 30, 0, 30, 0)

# Add a title using 18pt Times New Roman Bold Italic font. Add 6 pixels top and bottom margins to
# the title.
title = c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)
title.setMargin2(0, 0, 6, 6)

# Add a separator line in white color just under the title
c.addLine(20, title.getHeight(), c.getWidth() - 21, title.getHeight(), 0xffffff)

# Tentatively set the plotarea at (70, 80) and of 480 x 240 pixels in size. Use transparent border
# and white grid lines
c.setPlotArea(70, 80, 480, 240, -1, -1, ChartDirector::Transparent, 0xffffff)

# Swap the axis so that the bars are drawn horizontally
c.swapXY()

# Add a multi-color bar chart layer using the supplied data. Use bar gradient lighting with the
# light intensity from 0.75 to 2.0
c.addBarLayer3(data, colors).setBorderColor(ChartDirector::Transparent, ChartDirector::barLighting(
    0.75, 2.0))

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

# Show the same scale on the left and right y-axes
c.syncYAxis()

# Set the bottom y-axis title using 10pt Arial Bold font
c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)

# Set y-axes to transparent
c.yAxis().setColors(ChartDirector::Transparent)
c.yAxis2().setColors(ChartDirector::Transparent)

# Disable ticks on the x-axis by setting the tick color to transparent
c.xAxis().setTickColor(ChartDirector::Transparent)

# Set the label styles of all axes to 8pt Arial Bold font
c.xAxis().setLabelStyle("arialbd.ttf", 8)
c.yAxis().setLabelStyle("arialbd.ttf", 8)
c.yAxis2().setLabelStyle("arialbd.ttf", 8)

# Adjust the plot area size, such that the bounding box (inclusive of axes) is 30 pixels from the
# left edge, 25 pixels below the title, 50 pixels from the right edge, and 25 pixels from the bottom
# edge.
c.packPlotArea(30, title.getHeight() + 25, c.getWidth() - 50, c.getHeight() - 25)

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