Vector Chart

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

require("chartdirector")

class VectorController < ApplicationController

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

    #
    # Render and deliver the chart
    #
    def getchart()
        # The (x, y) coordinates of the starting point of the vectors
        dataX = [20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, 80,
            100, 20, 40, 60, 80, 100]
        dataY = [20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80, 80,
            100, 100, 100, 100, 100]

        # The lengths (radii) and directions (angles) of the vectors
        dataR = [6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6, 6]
        dataA = [-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135,
            180, 135, 120, -135, -150, 180, 150, 135]

        # Create a XYChart object of size 450 x 390 pixels
        c = ChartDirector::XYChart.new(450, 390)

        # Set the plotarea at (55, 40) 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, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1)

        # Add a title to the chart using 18pt Times Bold Itatic font.
        c.addTitle("Vector Chart Demonstration", "timesbi.ttf", 18)

        # Add a title to the y axis using 12pt Arial Bold Italic font
        c.yAxis().setTitle("Y Axis Title", "arialbi.ttf", 12)

        # Add a title to the x axis using 12pt Arial Bold Italic font
        c.xAxis().setTitle("X Axis Title", "arialbi.ttf", 12)

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

        # Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to
        # 11 pixels
        c.addVectorLayer(dataX, dataY, dataR, dataA, ChartDirector::YAxisScale, 0x0000cc
            ).setArrowHead(11)

        # 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/vector.rb

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

# The (x, y) coordinates of the starting point of the vectors
dataX = [20, 40, 60, 80, 100, 20, 40, 60, 80, 100, 20, 40, 58, 62, 80, 100, 20, 40, 60, 80, 100, 20,
    40, 60, 80, 100]
dataY = [20, 20, 20, 20, 20, 40, 40, 40, 40, 40, 60, 60, 60, 60, 60, 60, 80, 80, 80, 80, 80, 100,
    100, 100, 100, 100]

# The lengths (radii) and directions (angles) of the vectors
dataR = [6, 6, 9, 6, 6, 6, 9, 12, 9, 6, 9, 12, 12, 12, 12, 9, 6, 9, 12, 9, 6, 6, 6, 9, 6, 6]
dataA = [-45, -30, 0, 30, 45, -60, -45, 0, 45, 60, -90, -90, -90, 90, 90, 90, -120, -135, 180, 135,
    120, -135, -150, 180, 150, 135]

# Create a XYChart object of size 450 x 390 pixels
c = ChartDirector::XYChart.new(450, 390)

# Set the plotarea at (55, 40) 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, 40, 350, 300, -1, -1, 0xc0c0c0, 0xc0c0c0, -1)

# Add a title to the chart using 18pt Times Bold Itatic font.
c.addTitle("Vector Chart Demonstration", "timesbi.ttf", 18)

# Add a title to the y axis using 12pt Arial Bold Italic font
c.yAxis().setTitle("Y Axis Title", "arialbi.ttf", 12)

# Add a title to the x axis using 12pt Arial Bold Italic font
c.xAxis().setTitle("X Axis Title", "arialbi.ttf", 12)

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

# Add a vector layer to the chart using blue (0000CC) color, with vector arrow size set to 11 pixels
c.addVectorLayer(dataX, dataY, dataR, dataA, ChartDirector::YAxisScale, 0x0000cc).setArrowHead(11)

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