ChartDirector Ver 4.1 (Ruby Edition)

Cylinder Bar Shading




This example demonstrates using cylinder shading effect for bars and gradient color for plot area background. It also demonstrates putting axis labels on both sides of the plot area.

The cylinder shading effect is the result of using the cylinder bar shape in 2D.

Source Code Listing

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

class CylinderlightbarController < ApplicationController

    def index()
        @title = "Cylinder 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 = [450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700]

        # The labels for the bar chart
        labels = ["1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004",
            "2005"]

        # Create a XYChart object of size 600 x 360 pixels
        c = ChartDirector::XYChart.new(600, 360)

        # Add a title to the chart using 18pts Times Bold Italic font
        c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)

        # Set the plotarea at (60, 40) and of size 480 x 280 pixels. Use a vertical
        # gradient color from light green (eeffee) to dark green (008800) as background.
        # Set border and grid lines to white (ffffff).
        c.setPlotArea(60, 40, 480, 280, c.linearGradientColor(60, 40, 60, 280, 0xeeffee,
            0x008800), -1, 0xffffff, 0xffffff)

        # Add a multi-color bar chart layer using the supplied data. Set cylinder bar
        # shape.
        c.addBarLayer3(data).setBarShape(ChartDirector::CircleShape)

        # 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 left y-axis and right y-axis title using 10pt Arial Bold font
        c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)
        c.yAxis2().setTitle("USD (millions)", "arialbd.ttf", 10)

        # Set all axes to transparent
        c.xAxis().setColors(ChartDirector::Transparent)
        c.yAxis().setColors(ChartDirector::Transparent)
        c.yAxis2().setColors(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)

        # 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.rhtml
<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/cylinderlightbar.rb
#!/usr/bin/env ruby
require("chartdirector")

# The data for the bar chart
data = [450, 560, 630, 800, 1100, 1350, 1600, 1950, 2300, 2700]

# The labels for the bar chart
labels = ["1996", "1997", "1998", "1999", "2000", "2001", "2002", "2003", "2004",
    "2005"]

# Create a XYChart object of size 600 x 360 pixels
c = ChartDirector::XYChart.new(600, 360)

# Add a title to the chart using 18pts Times Bold Italic font
c.addTitle("Annual Revenue for Star Tech", "timesbi.ttf", 18)

# Set the plotarea at (60, 40) and of size 480 x 280 pixels. Use a vertical gradient
# color from light green (eeffee) to dark green (008800) as background. Set border
# and grid lines to white (ffffff).
c.setPlotArea(60, 40, 480, 280, c.linearGradientColor(60, 40, 60, 280, 0xeeffee,
    0x008800), -1, 0xffffff, 0xffffff)

# Add a multi-color bar chart layer using the supplied data. Set cylinder bar shape.
c.addBarLayer3(data).setBarShape(ChartDirector::CircleShape)

# 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 left y-axis and right y-axis title using 10pt Arial Bold font
c.yAxis().setTitle("USD (millions)", "arialbd.ttf", 10)
c.yAxis2().setTitle("USD (millions)", "arialbd.ttf", 10)

# Set all axes to transparent
c.xAxis().setColors(ChartDirector::Transparent)
c.yAxis().setColors(ChartDirector::Transparent)
c.yAxis2().setColors(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)

# output the chart
c.makeChart("cylinderlightbar.png")