Parametric Curve Fitting

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

require("chartdirector")

class ParamcurveController < ApplicationController

    def index()
        @title = "Parametric Curve Fitting"
        @ctrl_file = File.expand_path(__FILE__)
        @noOfCharts = 1
        render :template => "templates/chartview"
    end

    #
    # Render and deliver the chart
    #
    def getchart()
        # The XY data of the first data series
        dataX0 = [10, 35, 17, 4, 22, 29, 45, 52, 63, 39]
        dataY0 = [2.0, 3.2, 2.7, 1.2, 2.8, 2.9, 3.1, 3.0, 2.3, 3.3]

        # The XY data of the second data series
        dataX1 = [30, 35, 17, 4, 22, 59, 43, 52, 63, 39]
        dataY1 = [1.0, 1.3, 0.7, 0.6, 0.8, 3.0, 1.8, 2.3, 3.4, 1.5]

        # The XY data of the third data series
        dataX2 = [28, 35, 15, 10, 22, 60, 46, 64, 39]
        dataY2 = [2.0, 2.2, 1.2, 0.4, 1.8, 2.7, 2.4, 2.8, 2.4]

        # Create a XYChart object of size 540 x 480 pixels
        c = ChartDirector::XYChart.new(540, 480)

        # Set the plotarea at (70, 65) and of size 400 x 350 pixels, with white background and a
        # light grey border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light
        # grey color (0xc0c0c0)
        c.setPlotArea(70, 65, 400, 350, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1)

        # Add a legend box with the top center point anchored at (270, 30). Use horizontal layout.
        # Use 10pt Arial Bold Italic font. Set the background and border color to Transparent.
        legendBox = c.addLegend(270, 30, false, "arialbi.ttf", 10)
        legendBox.setAlignment(ChartDirector::TopCenter)
        legendBox.setBackground(ChartDirector::Transparent, ChartDirector::Transparent)

        # Add a title to the chart using 18 point Times Bold Itatic font.
        c.addTitle("Parametric Curve Fitting", "timesbi.ttf", 18)

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

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

        # Add a scatter layer using (dataX0, dataY0)
        c.addScatterLayer(dataX0, dataY0, "Polynomial", ChartDirector::GlassSphere2Shape, 11,
            0xff0000)

        # Add a degree 2 polynomial trend line layer for (dataX0, dataY0)
        trend0 = c.addTrendLayer2(dataX0, dataY0, 0xff0000)
        trend0.setLineWidth(3)
        trend0.setRegressionType(ChartDirector::PolynomialRegression(2))

        # Add a scatter layer for (dataX1, dataY1)
        c.addScatterLayer(dataX1, dataY1, "Exponential", ChartDirector::GlassSphere2Shape, 11,
            0x00aa00)

        # Add an exponential trend line layer for (dataX1, dataY1)
        trend1 = c.addTrendLayer2(dataX1, dataY1, 0x00aa00)
        trend1.setLineWidth(3)
        trend1.setRegressionType(ChartDirector::ExponentialRegression)

        # Add a scatter layer using (dataX2, dataY2)
        c.addScatterLayer(dataX2, dataY2, "Logarithmic", ChartDirector::GlassSphere2Shape, 11,
            0x0000ff)

        # Add a logarithmic trend line layer for (dataX2, dataY2)
        trend2 = c.addTrendLayer2(dataX2, dataY2, 0x0000ff)
        trend2.setLineWidth(3)
        trend2.setRegressionType(ChartDirector::LogarithmicRegression)

        # 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/paramcurve.rb

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

# The XY data of the first data series
dataX0 = [10, 35, 17, 4, 22, 29, 45, 52, 63, 39]
dataY0 = [2.0, 3.2, 2.7, 1.2, 2.8, 2.9, 3.1, 3.0, 2.3, 3.3]

# The XY data of the second data series
dataX1 = [30, 35, 17, 4, 22, 59, 43, 52, 63, 39]
dataY1 = [1.0, 1.3, 0.7, 0.6, 0.8, 3.0, 1.8, 2.3, 3.4, 1.5]

# The XY data of the third data series
dataX2 = [28, 35, 15, 10, 22, 60, 46, 64, 39]
dataY2 = [2.0, 2.2, 1.2, 0.4, 1.8, 2.7, 2.4, 2.8, 2.4]

# Create a XYChart object of size 540 x 480 pixels
c = ChartDirector::XYChart.new(540, 480)

# Set the plotarea at (70, 65) and of size 400 x 350 pixels, with white background and a light grey
# border (0xc0c0c0). Turn on both horizontal and vertical grid lines with light grey color
# (0xc0c0c0)
c.setPlotArea(70, 65, 400, 350, 0xffffff, -1, 0xc0c0c0, 0xc0c0c0, -1)

# Add a legend box with the top center point anchored at (270, 30). Use horizontal layout. Use 10pt
# Arial Bold Italic font. Set the background and border color to Transparent.
legendBox = c.addLegend(270, 30, false, "arialbi.ttf", 10)
legendBox.setAlignment(ChartDirector::TopCenter)
legendBox.setBackground(ChartDirector::Transparent, ChartDirector::Transparent)

# Add a title to the chart using 18 point Times Bold Itatic font.
c.addTitle("Parametric Curve Fitting", "timesbi.ttf", 18)

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

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

# Add a scatter layer using (dataX0, dataY0)
c.addScatterLayer(dataX0, dataY0, "Polynomial", ChartDirector::GlassSphere2Shape, 11, 0xff0000)

# Add a degree 2 polynomial trend line layer for (dataX0, dataY0)
trend0 = c.addTrendLayer2(dataX0, dataY0, 0xff0000)
trend0.setLineWidth(3)
trend0.setRegressionType(ChartDirector::PolynomialRegression(2))

# Add a scatter layer for (dataX1, dataY1)
c.addScatterLayer(dataX1, dataY1, "Exponential", ChartDirector::GlassSphere2Shape, 11, 0x00aa00)

# Add an exponential trend line layer for (dataX1, dataY1)
trend1 = c.addTrendLayer2(dataX1, dataY1, 0x00aa00)
trend1.setLineWidth(3)
trend1.setRegressionType(ChartDirector::ExponentialRegression)

# Add a scatter layer using (dataX2, dataY2)
c.addScatterLayer(dataX2, dataY2, "Logarithmic", ChartDirector::GlassSphere2Shape, 11, 0x0000ff)

# Add a logarithmic trend line layer for (dataX2, dataY2)
trend2 = c.addTrendLayer2(dataX2, dataY2, 0x0000ff)
trend2.setLineWidth(3)
trend2.setRegressionType(ChartDirector::LogarithmicRegression)

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