ChartDirector Ver 4.1 (Ruby Edition)

Enhanced Area Chart




This example extends the Simple Area Chart example by decorating the chart using a number of chart formatting features.

Source Code Listing

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

class EnhancedareaController < ApplicationController

    def index()
        @title = "Enhanced Area 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 area chart
        data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35,
            50, 66, 56, 48, 52, 65, 62]

        # The labels for the area chart
        labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12",
            "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"]

        # Create a XYChart object of size 600 x 300 pixels, with a pale blue (eeeeff)
        # background, black border, 1 pixel 3D border effect and rounded corners.
        c = ChartDirector::XYChart.new(600, 300, 0xeeeeff, 0x000000, 1)
        c.setRoundedFrame()

        # Set directory for loading images to current script directory
        c.setSearchPath(File.dirname(__FILE__))

        # Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff)
        # background. Set horizontal and vertical grid lines to grey (cccccc).
        c.setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

        # Add a title box to the chart using 15 pts Times Bold Italic font. The text is
        # white (ffffff) on a deep blue (000088) background, with soft lighting effect
        # from the right side.
        c.addTitle(
            "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance " \
            "Enhancer <*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 15, 0xffffff
            ).setBackground(0x000088, -1, ChartDirector::softLighting(ChartDirector::Right
            ))

        # Add a title to the y axis
        c.yAxis().setTitle("Energy Concentration (KJ per liter)")

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

        # Display 1 out of 3 labels on the x-axis.
        c.xAxis().setLabelStep(3)

        # Add a title to the x axis using CDML
        c.xAxis().setTitle(
            "<*block,valign=absmiddle*><*img=clock.png*>  Elapsed Time (hour)<*/*>")

        # Set the axes width to 2 pixels
        c.xAxis().setWidth(2)
        c.yAxis().setWidth(2)

        # Add an area layer to the chart using a gradient color that changes vertically
        # from semi-transparent red (80ff0000) to semi-transparent white (80ffffff)
        c.addAreaLayer(data, c.linearGradientColor(0, 50, 0, 255, 0x80ff0000, 0x80ffffff))

        # Add a custom CDML text at the bottom right of the plot area as the logo
        c.addText(575, 245,
            "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \
            "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
            ).setAlignment(ChartDirector::BottomRight)

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

# The data for the area chart
data = [30, 28, 40, 55, 75, 68, 54, 60, 50, 62, 75, 65, 75, 89, 60, 55, 53, 35, 50,
    66, 56, 48, 52, 65, 62]

# The labels for the area chart
labels = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
    "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24"]

# Create a XYChart object of size 600 x 300 pixels, with a pale blue (eeeeff)
# background, black border, 1 pixel 3D border effect and rounded corners.
c = ChartDirector::XYChart.new(600, 300, 0xeeeeff, 0x000000, 1)
c.setRoundedFrame()

# Set the plotarea at (55, 55) and of size 520 x 195 pixels, with white (ffffff)
# background. Set horizontal and vertical grid lines to grey (cccccc).
c.setPlotArea(55, 55, 520, 195, 0xffffff, -1, -1, 0xcccccc, 0xcccccc)

# Add a title box to the chart using 15 pts Times Bold Italic font. The text is white
# (ffffff) on a deep blue (000088) background, with soft lighting effect from the
# right side.
c.addTitle(
    "<*block,valign=absmiddle*><*img=star.png*><*img=star.png*> Performance " \
    "Enhancer <*img=star.png*><*img=star.png*><*/*>", "timesbi.ttf", 15, 0xffffff
    ).setBackground(0x000088, -1, ChartDirector::softLighting(ChartDirector::Right))

# Add a title to the y axis
c.yAxis().setTitle("Energy Concentration (KJ per liter)")

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

# Display 1 out of 3 labels on the x-axis.
c.xAxis().setLabelStep(3)

# Add a title to the x axis using CDML
c.xAxis().setTitle(
    "<*block,valign=absmiddle*><*img=clock.png*>  Elapsed Time (hour)<*/*>")

# Set the axes width to 2 pixels
c.xAxis().setWidth(2)
c.yAxis().setWidth(2)

# Add an area layer to the chart using a gradient color that changes vertically from
# semi-transparent red (80ff0000) to semi-transparent white (80ffffff)
c.addAreaLayer(data, c.linearGradientColor(0, 50, 0, 255, 0x80ff0000, 0x80ffffff))

# Add a custom CDML text at the bottom right of the plot area as the logo
c.addText(575, 245,
    "<*block,valign=absmiddle*><*img=small_molecule.png*> <*block*>" \
    "<*font=timesbi.ttf,size=10,color=804040*>Molecular\nEngineering<*/*>"
    ).setAlignment(ChartDirector::BottomRight)

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