ChartDirector 6.0 (Ruby Edition)

Contour Chart




This example demonstrates creating a contour chart.

Source Code Listing

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

class ContourController < ApplicationController

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

    #
    # Render and deliver the chart
    #
    def getchart()
        # The x and y coordinates of the grid
        dataX = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
        dataY = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

        # The values at the grid points. In this example, we will compute the values using the
        # formula z = x * sin(y) + y * sin(x).
        dataZ = Array.new(dataX.length * dataY.length, 0)
        0.upto(dataY.length - 1) do |yIndex|
            y = dataY[yIndex]
            0.upto(dataX.length - 1) do |xIndex|
                x = dataX[xIndex]
                dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x)
            end
        end

        # Create a XYChart object of size 600 x 500 pixels
        c = ChartDirector::XYChart.new(600, 500)

        # Add a title to the chart using 15 points Arial Bold Italic font
        c.addTitle("z = x * sin(y) + y * sin(x)      ", "arialbi.ttf", 15)

        # Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black
        # (80000000) dotted lines for both horizontal and vertical grid lines
        c.setPlotArea(75, 40, 400, 400, -1, -1, -1, c.dashLineColor(0x80000000,
            ChartDirector::DotLine), -1)

        # Set x-axis and y-axis title using 12 points Arial Bold Italic font
        c.xAxis().setTitle("X-Axis Title Place Holder", "arialbi.ttf", 12)
        c.yAxis().setTitle("Y-Axis Title Place Holder", "arialbi.ttf", 12)

        # Set x-axis and y-axis labels to use Arial Bold font
        c.xAxis().setLabelStyle("arialbd.ttf")
        c.yAxis().setLabelStyle("arialbd.ttf")

        # When auto-scaling, use tick spacing of 40 pixels as a guideline
        c.yAxis().setTickDensity(40)
        c.xAxis().setTickDensity(40)

        # Add a contour layer using the given data
        layer = c.addContourLayer(dataX, dataY, dataZ)

        # Move the grid lines in front of the contour layer
        c.getPlotArea().moveGridBefore(layer)

        # Add a color axis (the legend) in which the top left corner is anchored at (505, 40). Set
        # the length to 400 pixels and the labels on the right side.
        cAxis = layer.setColorAxis(505, 40, ChartDirector::TopLeft, 400, ChartDirector::Right)

        # Add a title to the color axis using 12 points Arial Bold Italic font
        cAxis.setTitle("Color Legend Title Place Holder", "arialbi.ttf", 12)

        # Set color axis labels to use Arial Bold font
        cAxis.setLabelStyle("arialbd.ttf")

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

# The x and y coordinates of the grid
dataX = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
dataY = [-10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

# The values at the grid points. In this example, we will compute the values using the formula z = x
# * sin(y) + y * sin(x).
dataZ = Array.new(dataX.length * dataY.length, 0)
0.upto(dataY.length - 1) do |yIndex|
    y = dataY[yIndex]
    0.upto(dataX.length - 1) do |xIndex|
        x = dataX[xIndex]
        dataZ[yIndex * dataX.length + xIndex] = x * Math.sin(y) + y * Math.sin(x)
    end
end

# Create a XYChart object of size 600 x 500 pixels
c = ChartDirector::XYChart.new(600, 500)

# Add a title to the chart using 15 points Arial Bold Italic font
c.addTitle("z = x * sin(y) + y * sin(x)      ", "arialbi.ttf", 15)

# Set the plotarea at (75, 40) and of size 400 x 400 pixels. Use semi-transparent black (80000000)
# dotted lines for both horizontal and vertical grid lines
c.setPlotArea(75, 40, 400, 400, -1, -1, -1, c.dashLineColor(0x80000000, ChartDirector::DotLine), -1)

# Set x-axis and y-axis title using 12 points Arial Bold Italic font
c.xAxis().setTitle("X-Axis Title Place Holder", "arialbi.ttf", 12)
c.yAxis().setTitle("Y-Axis Title Place Holder", "arialbi.ttf", 12)

# Set x-axis and y-axis labels to use Arial Bold font
c.xAxis().setLabelStyle("arialbd.ttf")
c.yAxis().setLabelStyle("arialbd.ttf")

# When auto-scaling, use tick spacing of 40 pixels as a guideline
c.yAxis().setTickDensity(40)
c.xAxis().setTickDensity(40)

# Add a contour layer using the given data
layer = c.addContourLayer(dataX, dataY, dataZ)

# Move the grid lines in front of the contour layer
c.getPlotArea().moveGridBefore(layer)

# Add a color axis (the legend) in which the top left corner is anchored at (505, 40). Set the
# length to 400 pixels and the labels on the right side.
cAxis = layer.setColorAxis(505, 40, ChartDirector::TopLeft, 400, ChartDirector::Right)

# Add a title to the color axis using 12 points Arial Bold Italic font
cAxis.setTitle("Color Legend Title Place Holder", "arialbi.ttf", 12)

# Set color axis labels to use Arial Bold font
cAxis.setLabelStyle("arialbd.ttf")

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