Surface Chart (3)

[Ruby On Rails Version - Controller] app/controllers/surface3_controller.rb

require("chartdirector")

class Surface3Controller < ApplicationController

    def index()
        @title = "Surface Chart (3)"
        @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 = Sin(x * x / 128 - y * y / 256 + 3) * Cos(x / 4 + 1 - Exp(y / 8))
        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] = Math.sin(x * x / 128.0 - y * y / 256.0 + 3
                    ) * Math.cos(x / 4.0 + 1 - Math.exp(y / 8.0))
            end
        end

        # Create a SurfaceChart object of size 750 x 600 pixels
        c = ChartDirector::SurfaceChart.new(750, 600)

        # Add a title to the chart using 20 points Times New Roman Italic font
        c.addTitle("Surface Energy Density       ", "timesi.ttf", 20)

        # Set the center of the plot region at (380, 260), and set width x depth x height to 360 x
        # 360 x 270 pixels
        c.setPlotRegion(380, 260, 360, 360, 270)

        # Set the elevation and rotation angles to 30 and 210 degrees
        c.setViewAngle(30, 210)

        # Set the perspective level to 60
        c.setPerspective(60)

        # Set the data to use to plot the chart
        c.setData(dataX, dataY, dataZ)

        # Spline interpolate data to a 80 x 80 grid for a smooth surface
        c.setInterpolation(80, 80)

        # Use semi-transparent black (c0000000) for x and y major surface grid lines. Use dotted
        # style for x and y minor surface grid lines.
        majorGridColor = 0xc0000000
        minorGridColor = c.dashLineColor(majorGridColor, ChartDirector::DotLine)
        c.setSurfaceAxisGrid(majorGridColor, majorGridColor, minorGridColor, minorGridColor)

        # Set contour lines to semi-transparent white (80ffffff)
        c.setContourColor(0x80ffffff)

        # Add a color axis (the legend) in which the left center is anchored at (665, 280). Set the
        # length to 200 pixels and the labels on the right side.
        c.setColorAxis(665, 280, ChartDirector::Left, 200, ChartDirector::Right)

        # Set the x, y and z axis titles using 12 points Arial Bold font
        c.xAxis().setTitle("X Title\nPlaceholder", "arialbd.ttf", 12)
        c.yAxis().setTitle("Y Title\nPlaceholder", "arialbd.ttf", 12)
        c.zAxis().setTitle("Z Title Placeholder", "arialbd.ttf", 12)

        # Output the chart
        send_data(c.makeChart2(ChartDirector::JPG), :type => "image/jpeg", :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/surface3.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 =
# Sin(x * x / 128 - y * y / 256 + 3) * Cos(x / 4 + 1 - Exp(y / 8))
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] = Math.sin(x * x / 128.0 - y * y / 256.0 + 3
            ) * Math.cos(x / 4.0 + 1 - Math.exp(y / 8.0))
    end
end

# Create a SurfaceChart object of size 750 x 600 pixels
c = ChartDirector::SurfaceChart.new(750, 600)

# Add a title to the chart using 20 points Times New Roman Italic font
c.addTitle("Surface Energy Density       ", "timesi.ttf", 20)

# Set the center of the plot region at (380, 260), and set width x depth x height to 360 x 360 x 270
# pixels
c.setPlotRegion(380, 260, 360, 360, 270)

# Set the elevation and rotation angles to 30 and 210 degrees
c.setViewAngle(30, 210)

# Set the perspective level to 60
c.setPerspective(60)

# Set the data to use to plot the chart
c.setData(dataX, dataY, dataZ)

# Spline interpolate data to a 80 x 80 grid for a smooth surface
c.setInterpolation(80, 80)

# Use semi-transparent black (c0000000) for x and y major surface grid lines. Use dotted style for x
# and y minor surface grid lines.
majorGridColor = 0xc0000000
minorGridColor = c.dashLineColor(majorGridColor, ChartDirector::DotLine)
c.setSurfaceAxisGrid(majorGridColor, majorGridColor, minorGridColor, minorGridColor)

# Set contour lines to semi-transparent white (80ffffff)
c.setContourColor(0x80ffffff)

# Add a color axis (the legend) in which the left center is anchored at (665, 280). Set the length
# to 200 pixels and the labels on the right side.
c.setColorAxis(665, 280, ChartDirector::Left, 200, ChartDirector::Right)

# Set the x, y and z axis titles using 12 points Arial Bold font
c.xAxis().setTitle("X Title\nPlaceholder", "arialbd.ttf", 12)
c.yAxis().setTitle("Y Title\nPlaceholder", "arialbd.ttf", 12)
c.zAxis().setTitle("Z Title Placeholder", "arialbd.ttf", 12)

# Output the chart
c.makeChart("surface3.jpg")