ChartDirector 6.0 (Ruby Edition)

Bubble XY Scaling



This example demonstrates a bubble chart with independent x and y bubble sizes and non-circular bubbles.

In ChartDirector, a bubble chart in general is a scatter layer with the symbol sizes controlled by some other data series.

ChartDirector supports using arbitrary symbols as bubbles. Thus bubble shape is not limited to circle but can be any shapes.

Furthermore, ChartDirector supports independent x and y sizes for bubbles. This is useful for creating charts in which the bubbles reflect some features of the data points, such as its confidence zone, x and y errors, x and y standard deviations, etc.

Source Code Listing

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

class BubblescaleController < ApplicationController

    def index()
        @title = "Bubble XY Scaling"
        @ctrl_file = File.expand_path(__FILE__)
        @noOfCharts = 1
        render :template => "templates/chartview"
    end

    #
    # Render and deliver the chart
    #
    def getchart()
        # The XY points for the bubble chart. The bubble chart has independent bubble size on the X
        # and Y direction.
        dataX0 = [1000, 1500, 1700]
        dataY0 = [25, 20, 65]
        dataZX0 = [500, 200, 600]
        dataZY0 = [15, 30, 20]

        dataX1 = [500, 1000, 1300]
        dataY1 = [35, 50, 75]
        dataZX1 = [800, 300, 500]
        dataZY1 = [8, 27, 25]

        dataX2 = [150, 300]
        dataY2 = [20, 60]
        dataZX2 = [160, 400]
        dataZY2 = [30, 20]

        # Create a XYChart object of size 450 x 420 pixels
        c = ChartDirector::XYChart.new(450, 420)

        # Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border
        # (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
        # (0xc0c0c0)
        c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1)

        # Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times
        # Bold Italic font. Set the background and border color to Transparent.
        c.addLegend(50, 30, false, "timesbi.ttf", 12).setBackground(ChartDirector::Transparent)

        # Add a title to the chart using 18pt Times Bold Itatic font.
        c.addTitle("Plasma Battery Comparison", "timesbi.ttf", 18)

        # Add titles to the axes using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Operating Current", "arialbi.ttf", 12)
        c.xAxis().setTitle("Operating Voltage", "arialbi.ttf", 12)

        # Set the axes line width to 3 pixels
        c.xAxis().setWidth(3)
        c.yAxis().setWidth(3)

        # Add (dataX0, dataY0) as a standard scatter layer, and also as a "bubble" scatter layer,
        # using circles as symbols. The "bubble" scatter layer has symbol size modulated by
        # (dataZX0, dataZY0) using the scale on the x and y axes.
        c.addScatterLayer(dataX0, dataY0, "Vendor A", ChartDirector::CircleSymbol, 9, 0xff3333,
            0xff3333)
        c.addScatterLayer(dataX0, dataY0, "", ChartDirector::CircleSymbol, 9, 0x80ff3333, 0x80ff3333
            ).setSymbolScale(dataZX0, ChartDirector::XAxisScale, dataZY0, ChartDirector::YAxisScale)

        # Add (dataX1, dataY1) as a standard scatter layer, and also as a "bubble" scatter layer,
        # using squares as symbols. The "bubble" scatter layer has symbol size modulated by
        # (dataZX1, dataZY1) using the scale on the x and y axes.
        c.addScatterLayer(dataX1, dataY1, "Vendor B", ChartDirector::SquareSymbol, 7, 0x3333ff,
            0x3333ff)
        c.addScatterLayer(dataX1, dataY1, "", ChartDirector::SquareSymbol, 9, 0x803333ff, 0x803333ff
            ).setSymbolScale(dataZX1, ChartDirector::XAxisScale, dataZY1, ChartDirector::YAxisScale)

        # Add (dataX2, dataY2) as a standard scatter layer, and also as a "bubble" scatter layer,
        # using diamonds as symbols. The "bubble" scatter layer has symbol size modulated by
        # (dataZX2, dataZY2) using the scale on the x and y axes.
        c.addScatterLayer(dataX2, dataY2, "Vendor C", ChartDirector::DiamondSymbol, 9, 0x00ff00,
            0x00ff00)
        c.addScatterLayer(dataX2, dataY2, "", ChartDirector::DiamondSymbol, 9, 0x8033ff33,
            0x8033ff33).setSymbolScale(dataZX2, ChartDirector::XAxisScale, dataZY2,
            ChartDirector::YAxisScale)

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

# The XY points for the bubble chart. The bubble chart has independent bubble size on the X and Y
# direction.
dataX0 = [1000, 1500, 1700]
dataY0 = [25, 20, 65]
dataZX0 = [500, 200, 600]
dataZY0 = [15, 30, 20]

dataX1 = [500, 1000, 1300]
dataY1 = [35, 50, 75]
dataZX1 = [800, 300, 500]
dataZY1 = [8, 27, 25]

dataX2 = [150, 300]
dataY2 = [20, 60]
dataZX2 = [160, 400]
dataZY2 = [30, 20]

# Create a XYChart object of size 450 x 420 pixels
c = ChartDirector::XYChart.new(450, 420)

# Set the plotarea at (55, 65) and of size 350 x 300 pixels, with a light grey border (0xc0c0c0).
# Turn on both horizontal and vertical grid lines with light grey color (0xc0c0c0)
c.setPlotArea(55, 65, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1)

# Add a legend box at (50, 30) (top of the chart) with horizontal layout. Use 12pt Times Bold Italic
# font. Set the background and border color to Transparent.
c.addLegend(50, 30, false, "timesbi.ttf", 12).setBackground(ChartDirector::Transparent)

# Add a title to the chart using 18pt Times Bold Itatic font.
c.addTitle("Plasma Battery Comparison", "timesbi.ttf", 18)

# Add titles to the axes using 12pt Arial Bold Italic font
c.yAxis().setTitle("Operating Current", "arialbi.ttf", 12)
c.xAxis().setTitle("Operating Voltage", "arialbi.ttf", 12)

# Set the axes line width to 3 pixels
c.xAxis().setWidth(3)
c.yAxis().setWidth(3)

# Add (dataX0, dataY0) as a standard scatter layer, and also as a "bubble" scatter layer, using
# circles as symbols. The "bubble" scatter layer has symbol size modulated by (dataZX0, dataZY0)
# using the scale on the x and y axes.
c.addScatterLayer(dataX0, dataY0, "Vendor A", ChartDirector::CircleSymbol, 9, 0xff3333, 0xff3333)
c.addScatterLayer(dataX0, dataY0, "", ChartDirector::CircleSymbol, 9, 0x80ff3333, 0x80ff3333
    ).setSymbolScale(dataZX0, ChartDirector::XAxisScale, dataZY0, ChartDirector::YAxisScale)

# Add (dataX1, dataY1) as a standard scatter layer, and also as a "bubble" scatter layer, using
# squares as symbols. The "bubble" scatter layer has symbol size modulated by (dataZX1, dataZY1)
# using the scale on the x and y axes.
c.addScatterLayer(dataX1, dataY1, "Vendor B", ChartDirector::SquareSymbol, 7, 0x3333ff, 0x3333ff)
c.addScatterLayer(dataX1, dataY1, "", ChartDirector::SquareSymbol, 9, 0x803333ff, 0x803333ff
    ).setSymbolScale(dataZX1, ChartDirector::XAxisScale, dataZY1, ChartDirector::YAxisScale)

# Add (dataX2, dataY2) as a standard scatter layer, and also as a "bubble" scatter layer, using
# diamonds as symbols. The "bubble" scatter layer has symbol size modulated by (dataZX2, dataZY2)
# using the scale on the x and y axes.
c.addScatterLayer(dataX2, dataY2, "Vendor C", ChartDirector::DiamondSymbol, 9, 0x00ff00, 0x00ff00)
c.addScatterLayer(dataX2, dataY2, "", ChartDirector::DiamondSymbol, 9, 0x8033ff33, 0x8033ff33
    ).setSymbolScale(dataZX2, ChartDirector::XAxisScale, dataZY2, ChartDirector::YAxisScale)

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

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